Lasioglossum manitouellum (Cockerell 1908)

Lasioglossum manitouellum (Cockerell)

Halictus manitouellus Cockerell, 1908:119 [female].

Halictus manitonellus.—Cockerell, 1910a:260 [lapsus calami].

Lasioglossum manitouellum.—Michener, 1951:1106 [Nearctic catalog].—Hurd, 1979:1957 [Nearctic catalog].—Evans, 1982:573 [predator, Philanthus barbatus Smith].

TYPE MATERIAL.—Cockerell described Lasioglossum manitouellum from a syntype series of four females. Only two of these specimens could be located, and the one labeled “TYPE” by Cockerell is herein designated the lectotype. This specimen, in the University of Colorado Collection at Boulder, is labeled.

T.D.A. & W.P. Cockerell./Manitou ([El Paso County], Col.[orado], Apr. 29 [19]04 [handwritten] TYPE [handwritten by Cockerell with red ink lines bordering lateral edges of label]/LECTOTYPE Halictus manitouellus Cockerell des.[ignated by] McGinley [handwritten on red label].

The lectotype is missing the last two tarsomeres of the middle left leg but otherwise is in excellent condition. The one known paralectotype is in the National Museum of Natural History, Smithsonian Institution.

DISTRIBUTION (Figure 504).—The latest Nearctic Hymenoptera catalog (Hurd, 1979) reports Lasioglossum manitouellum only from Colorado. This species is now known to occur in Arizona, Colorado, Kansas, New Mexico, Texas, and south into Chihuahua, Mexico. Two anomalous females from Hidalgo and Chiapas, Mexico, are herein only tentatively associated with L. manitouellum.

DIAGNOSIS.—Females of Lasioglossum manitouellum can be recognized by the combination of their entirely granuloso-punctate mesoscuta (Figure 510), moderately short heads (Figure 505), lack of acarinaria, and hyaline forewings with infuscated apices (Figure 229). The entirely granuloso-punctate mesoscutum is characteristic of many Mexican Lasioglossum species but is found in only three species occurring in the United States: L. manitouellum, L. acarophilum, and L. jubatum. The latter two species differ from L. manitouellum in having large acarinaria on the anterior surface of tergum I (Figures 247, 478). Lasioglossum heterorhinum, L. lampronotum, and L. desertum have the anterior mesoscutal surface granuloso-punctate but the punctures are distinctly separated posteriorly. Among Mexican species, L. xyriotropis is most similar to L. manitouellum but differs by having a complete pronotal lateral carina (Figure 732; narrowly but distinctly interrupted in L. manitouellum). Lasioglossum transvorsum and L. asaphes are superficially similar to L. manitouellum but have longer heads (Figures 275, 646) and differ in other details listed in the diagnosis for both species.

Lasioglossum manitouellum males are best diagnosed by the combination of their short heads (Figure 506), hyaline forewings with infuscated apices, and the elongate, lateral hair fringes on the posterior edge of sternum V (Figure 511). The vestiture of sternum V is very similar to that of Lasioglossum heterorhinum and L. lampronotum males (Figure 464). However, the latter species do not have infuscated forewing apices and have conspicuously complete pronotal lateral carinae (distinctly interrupted in L. manitouellum males).

DESCRIPTION.—FEMALE: (1) Length 8.3–10.6 mm (x = 9.5, n = 15); (2) wing length 2.7–3.1 mm (x = 2.9, n = 15); (3) abdominal width 2.5–3.1 mm (x = 2.9, n = 15).

Structure: (4) Head moderately short (Figure 505; length/width ratio 0.85–0.96, x = 0.91, n = 15). (7) Supraclypeal area evenly rounded, (8) moderately protuberant. (9) Clypeus projecting approximately 0.69 of its length below lower margin of eyes; (11) surface with narrow median longitudinal sulcation. (14) Distance between lateral ocelli subequal to distance between lateral ocellus and eye. (23) Flagellomere 1 shorter than 2 along dorsal surface. Labrum as in Figure 507; (27) distal keel moderately broad in frontal view, lateral edges bowed; (28) distal lateral projections moderately well developed, triangular; (29) fimbrial setae acutely pointed.

(32) Pronotal lateral angle broadly obtuse; (33) pronotal lateral ridge incomplete, interrupted by oblique lateral sulcus; (34) lower portion of lateral ridge narrowly rounded. (35) Mesoscutal lip weakly bilobed, (36) moderately elevated from pronotum. (40) Dorsal surface of propodeum about 0.74 the length of scutellum and about 1.2 times the length of metanotum, (41) slightly depressed centrally, (42) posterior margin broadly rounded; (43) propodeal triangle weakly defined, evident medially as an inconspicious V-shaped elevation, lateral rims absent; (44) lateral carinae extending at most to midpoint of posterior surface. (45) Tibial spur as in Figure 39.

(46) Lateral edge of metasomal tergum II weakly sinuate, nearly straight.

Sculpture: (47) Face shiny, (48) densely punctate below ocelli, punctures contiguous, only slightly less dense near antennae. (51) Supraclypeal area extremely granulate; (52) punctures separated by their width laterally, becoming less dense centrally. (53) Clypeus granulate basally, apical two-thirds polished; (54) punctation sparse, punctures separated by their width basally, becoming obscure apically, apicolateral areas impunctate. (56) Mesoscutum mostly moderately shiny, dull on median anterior portion; (57) punctation as in Figure 510, granuloso-punctate, less dense posteriorly. (58) Scutellum nearly uniformly punctate, punctures less dense than those of mesoscutum, punctures separated by their width or slightly less. (63) Dorsal surface of propodeum (Figure 509) irregularly striate laterally, becoming ruguloso-striolate medially, striae and rugulae reaching posterior margin or nearly so; (64) surface shiny, mostly smooth, alveolate only along extreme basal edge. (65) Metasomal tergum I moderately shiny; (66) punctation fine, extremely dense, punctures nearly contiguous.

Coloration: (71) Wing membrane mostly hyaline with conspicuous infuscated apex beyond marginal cell.

Vestiture: (74) Pubescence of head white. (75) Pubescence of thorax mostly white, pale yellowish brown on scutellum; (76) mesoscutal hairs sparse, inconspicuous, obscurely plumose. (77) Hind tibial hair color differentiated, most hairs white, dorsal hairs dark brown basally, becoming white at tibial midpoint. (78) Anterior hairs of metasomal tergum I white; (79) basal hair bands of terga II–IV yellowish white. (80) Acarinarium absent, elongate hairs scattered over anterior surface of tergum I.

MALE: Similar to female except as follows: (1) length 6.9–8.2 mm (x = 7.5, n = 10); (2) wing length 2.3–2.7 mm (x = 2.5, n = 10); (3) abdominal width 1.9–2.1 mm (x = 2.0, n = 10). (4) Head as in Figure 506 (length/width ratio 0.87–0.96, x = 0.91, n = 10). (5) Gena slightly wider than eye, (6) strongly produced posteriorly. (10) Clypeal surface flat. Labrum as in Figure 508; (24) distal process absent; (25) basal area depressed medially; (26) basal lateral depressions conspiciously developed. (30) Mandible short, just reaching opposing clypeal angle. (53) Clypeus granulate along basal edge, apical two-thirds polished; (54) punctures well formed and dense basally, very fine and scattered over apical two-thirds. (68) Clypeal maculation present. (69) Flagellum entirely dark. (72) Tarsi dark, concolorous with tibiae.

Vestiture: Sternal vestiture as in Figure 511; (82) hairs on sternum IV erect, moderately elongate, without noticeable pattern; (83) sternum V with median rosette of short erect hairs, posterior sternal edge with moderately elongate, widely separated lateral hair lobes.

Terminalia: Sterna VII–VIII as in Figure 517; (85) sternum VIII with short, narrowly rounded median process. Genitalia as in Figures 512–516; (86) gonobase moderately elongate; (87) gonostylus slender, moderately elongate, apex narrowly rounded; (89) retrorse membranous lobe broad; (90) volsella with broadly rounded lateral lobe.

FLIGHT RECORDS (Figure 518).—Lasioglossum manitouellum females have been collected in every month from February to December, with peaks in later March and again in early October. The early records are two females, Cochise Co., Arizona, 19 Feb 1963; one female, Pima Co., Arizona, 22 Feb 1956. The late records are two females, 1–10 Nov 1965, Cochise Co.; one female, 11 Nov 1953, Pima Co.; one female, 10 Dec 1967, Cochise Co. Males have been collected in May, July through October, and in December. The one May record was from Nuevo Leon (near Monterrey), Mexico. The two December records were from Cochise Co., Arizona.

FLOWER RECORDS.—Females (71): Compositae 31%; Rosaceae 22%; Ericaceae 18%; Anacardiaceae 13%. Total: 71 in 12 families, 13 genera as follows:

Arctostaphylos 12; Ceanothus 3; Cimicifuga *1(1) (collecting pollen, 0. Pellmyr, pers. comm.); Geranium 1; Melilotus 1; Nolina 1; *Penstemon 1(1) (tentatively associated female from Hidalgo); Prunus 15; Rhus 9; Salix 3; Solanum 3; Solidago 3; Viguiera 18.

SPECIMENS EXAMINED.—299 (248, 51).

MEXICO. CHIAPAS: San Cristobal de las Casas, 2 Aug 1956, J.W. MacSwain, D.D. Linsdale, (1; UCB). CHIHUAHUA: Santa Barbara-Ojito, 14 Mar 1948, G.M. Bradt (3; AMNH). HIDALGO: Baranca de San Vicente (Laredo Highway), 9 Aug 1957, R.M. Straw, D.P. Gregory (1; OrS). NUEVO LEON: Mesa de Chipinque (near Monterrey), 29–30 May 1977, C. Porter, A. Cerbone (1; KU).

UNITED STATES. ARIZONA: Cochise Co.; Coconino Co.: Oak Greek Canyon (6.5 mi N Sedona); Gila Co.; Globe, Parker Greek (Sierra Ancha), Sierra Ancha Experiment Station; Graham Co.: Graham Mountains; Pima Co.; Santa Cruz Co.: Patagonia, 8 mi S (Hidden Springs Valley); Yavapai Co.: Jerome, 4 mi S.

COLORADO: Boulder Co.: Boulder; El Paso Co.: Colorado Springs, Manitou; Larimer Co.: Fort Collins (14–16 mi W), Hewlett Gulch, Loveland (10–13 mi WSW); Teller Co.: Green Mountain Falls. KANSAS: Marshall Co.: unspecified locality. NEW MEXICO: Bernalillo Co.: Albuquerque; Catron Co.: Mogollon Mountains; Grant Co.: McMillan Camp (13 mi N Silver City), Pinos Altos Mountains; Hidalgo Co.: near Rodeo; Sandoval Co.: Jemez Springs. TEXAS: Brewster Co.: Big Bend National Park (Basin, south rim).