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Ataenius duncani

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Ataenius duncani

DESCRIPTION.—Holotype Male: Length 4.1 mm; width 1.5 mm. Elongate, parallel, moderately convex, polished, piceous, legs reddish. Head convex, margin strongly, sharply, triangularly dentate each side of shallow, arcuate emargination, sides straight to sharply rounded right-angled genae, edge finely reflexed; clypeus finely, transversely rugulose except for a band of fine, close punctures just in front of the frontal basal band of close, moderate punctures, generally separated by their diameters or less. Pronotum convex, 1.1 mm long, 1.5 mm wide, sides arcuate, sides and base finely margined, without marginal setae, anterior angles narrowly rounded, posterior angles very broadly, smoothly rounded, surface with scattered but rather evenly distributed, deep, moderate punctures, usually separated by one to three or four times their diameters. Scutellum normal. Elytra 2.5 mm long and 1.5 mm wide, humeri finely, not conspicuously dentate, striae moderately deep, finely crenate-punctate, the punctures separated by four or five times their diameters, the punctures as wide as the striae; intervals flat, the 10th interval slightly convex, surface smooth, impunctate. Mesosternum finely carinate between the coxae. Metasternum smooth, shining, midline fine, long, not deeply impressed, a trace of alutaceous sculpture at extreme sides, metasternal triangle each side not deeply impressed or sharply delineated. Abdominal sterna smooth, shining, very finely fluted along anterior margins, fluting slightly deeper and longer over lateral fourth; 4th sternum noticeably shorter at middle, 5th sternum deeply, finely fluted in front and only half as long as preceding sternum at middle; pygidium shining, polished, convex, twice as long as 4th abdominal sternum at middle. Anterior femur with fine marginal groove only along anterior margin, surface smooth, polished. Middle and hind femora similarly smooth, polished, and without marginal lines. Posterior tibial fringe of seven setae, without accessory spine, first posterior tarsal segment one-fourth longer than the long spur and about one-fourth longer than the following three segments combined.

Allotype Female: Length 4.6 mm; width 1.8 mm. About the only noticeable difference from the male is in the pygidium and 5th abdominal sternum, which are about equal in length and only slightly shorter than the 4th sternum.

HOLOTYPE.—USNM 71736.

TYPE-LOCALITY.—Arizona, Tucson. Collected at black light 11 August 1968 by K. Stephan.

SPECIMENS EXAMINED.—309.

DATES COLLECTED.—May 23 to November 10.

DISTRIBUTION (Figure 2).—Paratypes. Arizona (239): “Arizona” (12), no other data. “Ariz.” (5): no date, J. W. Green (3), Knauss Coll. (2, KSU). “So. Ariz.” (1), no date, Duncan. Agua Fria (2), 6 August 1917. Arlington (near), Gillespie Dam, Maricopa County (3), black light, J. Stibeck. Avondale Ranch, Agua Fria River (10), 7 August 1917, Wheeler (MCZ). Chinle (2), 26 July 1935, Brues Coll. (MCZ). Chiricahua Mountains (38): 9, 16 July 1929, 14 June 1936, 26 July, 2 August 1952, 15, 29 July 1953, 24 July 1955, 27 August 1957, 9, 16, 30 July 1959, 7, 15 August 1959, D. J. and J. N. Knull (36, OSU); Chiricahua National Monument (2), 17 August 1952, Leech and Green (Iowa State College). Douglas (3), 24 August 1952, B. Malkin. Florence (5): 3, 19 June, 26 July, C. R. Biederman (4); 28 July 1917, Wheeler (1, MCZ). Fort Apache (1), 6000 ft, 1 August 1928, R. B. Streets (Werner Coll.). Fort Grant (2), 23 July, Hubbard and Schwarz. Kirkland (2), 4500 ft, Peoples Valley, Yavapai County, 22–24 August 1927 (Cornell Univ.). Nogales (3), 4, 7 July 1949, 4 August 1954, D. J. and J. N. Knull (OSU). Palomas, Yuma County (1), 8 August 1917, “C. V. Biol. Exp.” (Cornell Univ.). Patagonia (4): 6 August 1936, M. Cazier (1); 5 July 1954, 11 August 1951, light trap, R. Schmitt (3, Werner Coll.). Phoenix (60): 3 August 1917, no other data (3); no date, G. E. Ball (6); no other data (8, USNM; 1, Field Museum; 23 Rutgers Univ.); 3 August 1917 (14, Cornell Univ.); no date, H. W. Wenzel (5, Field Museum). Pima County (8): Organ Pipe Cactus National Monument (3), 11 August 1955, G. D. Butler and F. G. Werner (Werner Coll.); Robles Ranch (5), 12 July 1947, McClay. Portal (8): 2, 5 August 1965, B. K. Dozier (7, B. K. Dozier Coll.); 28 July to 6 August 1966, Karl H. Stephan (1, Stephan Coll.). Safford (1), light trap, 23 June 1954, F. G. Werner (Werner Coll.). San Simon (1), 19 September 1957, B. Benesh. Santa Cruz Village, Cobabi Mtn. (1), 10–12 August 1916. Southwest Research Station, near Portal, Cochise County (8): 7, 11 July 1961, B. Benesh (2); 5400 ft, 8 July 1956, O. L. Cartwright (1); 31 July 1966, J. W. Tilden (5). Sunnyside Canyon, Huachuca Mts. (2), 8 August, 1 September 1970, K. Stephan. Tempe (2), 7 August 1922, E. W. Walter. Texas Pass, Dragon Mtn. (1), 21 July 1917, “C. V. Biol. Exp.” (Cornell Univ.). Tucson (8): no other data (2, Field Museum); 1 September 1947, R. S. Beal (2, W. F. Barr); 20 July, Hubbard and Schwarz (1, USNM); 12 July 1935, A. A. Nichol (1); 10 November 1937, Flora Sands (1, Werner Coll.); 11 August 1968, black light, K. Stephan (1). Wilcox (8, includes allotype), 24 July, Hubbard and Schwarz. Wilcox Playa, Cochise County (37), 24 July, 29 August, 12 September 1970, K. Stephan. California (19): “California” (1), no date, Casey Coll. Blythe, Riverside County (10), 27 June, 12, 26 July 1946, W. F. Barr (W. F. Barr Coll.). Ripley, Riverside County (8), 24 July, W. F. Barr and P. D. Hurd. Colorado (1): Pueblo, 30 August 1949, G. H. Nelson (Nelson Coll.). Kansas (5): Hamilton County (2), 3350 ft, F. H. Snow (Drury Coll.). Reno County (1), no date, J. C. Warren (Field Museum). Sedgwick County (1), no date, J. C. Warren (Field Museum). Wyandotte County (1), no date, J. C. Warren (Field Museum). New Mexico (13): Albuquerque (1), 11 July 1954, W. Downes (Iowa State College). Bernalillo (7), 16 July 1922, 15 July 1923, F. Psota (Field Museum). Deming (3), 22 July, Hubbard and Schwarz (USNM). Las Vegas (1), 14 August 1901, Barber and Schwarz. Rodeo (18 mi N), Peloncillo Mts. (1), 5 July 1956, H. and A. Howden. Texas (31): “Texas,” no other data (1, MCZ). Alpine (5), 1–15 June 1926, O. C. Poling (Cornell Univ.). Brewster County, Sunny Glen Ranch (1), 5000–7000 ft, May 1926, C. C. Poling (USNM). Dallas (1), no other data. Davis Mountains (8), 14–24 June 1957, D. J. and J. N. Knull (OSU). Eagle Pass (8), 2 July 1947, B. Malkin. El Paso (1), no date, Wickham Coll. (USNM). Hidalgo County (1), 23 May 1951, D. J. and J. N. Knull (OSU). Limpia Canyon, Fort Davis, Jeff Davis County (1), at light, 28 July 1969, W. Suter. San Diego (4), 25 May, Hubbard and Schwarz (USNM).
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bibliographic citation
Cartwright, Oscar Ling. 1974. "Ataenius, Aphotaenius, and Pseudataenius of the United States and Canada (Coleoptera: Scarabaeidae: Aphodiinae)." Smithsonian Contributions to Zoology. 1-106. https://doi.org/10.5479/si.00810282.154