Pelinoides andinus Mathis 1985

Pelinoides andinus

DESCRIPTION—As in generic and species group descriptions with the following details Small shore flies, length 170 to 190 mm

Head (Figures 2–3): Mesofrons and ocellar tubercle moderately densely and mostly uniformly brown microtomentose, at most slightly subshiny anterior of ocellar tubercle; parafrons bark brown posteriorly to yellow anteriorly, posterolaterally appearing velvety First flagellomere yellowish basoventrally, tan to dark brown apicodorsally Face at narrowest point comparatively narrow, width subequal to length of 1st flagellomere, midface grayish to lightly bluish gray; parafacies and gena lightly yellowish white Eye-to-cheek ratio 036 Palpus brownish

Thorax (Figure 4): Mesonotum densely microtomentose, mostly uniformly brown but with faint golden brown stripes laterad of acrostichal track, stripes more evident anteriad; scutellar disc densely microtomentose; basolateral scutellar margins not appearing velvety Acrostichal rows with 3–5 larger setulae; dorsocentral bristles 5, anterior 1 or 2 presutural; presutural bristle evident; 3–4 setulae in supra-alar region; scutellum with 1 anaclinate large seta and several smaller setulae at margin of disc and lateral margin, anterolaterad of scutellar bristles; notopleural bristles usually 2, anterior one weaker, posterior one inserted at level higher than anterior bristle; anepisternum with several setulae and 1 bristle at posterior margin; anepimeron with 1 bristle inserted toward anteroventral margin; katepisternal bristle evident Halter with knob brownish to lightly blackish brown; stem yellowish Wing hyaline, very lightly infumose; costal vein ratio 054; M vein ratio 053

Abdomen: Mostly dark brown, vestiture less densely microtomentose than on thorax Male abdomen and terminalia (Figure 5) as follows: epandrium with sharp, moderately long to long, tooth-like, ventral projection posteroventrally, extended below ventral epandrial margin, projection shallowly curved anteriorly; ventral epandrial margin deeply emarginate, anteroventral portion angulate and with longer setulae; aedeagal apodeme 4 to 5 times higher than wide, narrowly triangular; aedeagus L-shaped with shorter arm basad, longer arm tapered, apex pointed; gonite broadly triangular

Figures 2–5—Pelinoides andinus: 2, head, lateral aspect; 3, head, anterior aspect; 4, thorax, dorsal aspect; 5, male terminalia, lateral aspect

TYPE MATERIAL—Holotype male is labeled “ECUADOR: Napo Prov Baeza (17 km S) 1815 m elev 17 Jan 1978 WNMathis” The allotype female and seven paratypes (4, 3; USNM) bear the same label data as the holotype Other paratypes are as follows: ECUADOR Napo Province: San Francisco de Borja, 1610 m, 17 Jan 1978, WN Mathis (7, 9; USNM) Pastaza Province: Rio Puyo, JR Levi-Castillo (1, 2; USNM) PERU Huánuco Province: Las Palmas (1 km S), 8 Feb 1984, WN Mathis (13, 8; USNM); Tingo Maria (6 km S), 8 Feb 1984, WN Mathis (1; USNM) The holotype is double mounted (minute nadel in plastic block), is in excellent condition, and is deposited in the Smithsonian Institution (USNM)

OTHER SPECIMENS EXAMINED—COLOMBIA Nariño 32 mi (512 km) N Pasto, 1550 m, 4 Mar 1955, EI Schlinger, ES Ross (1; CAS), PERU Tingo Maria, 40 mi (64 km) E, 12 Dec 1954, EI Schlinger, ES Ross (1; CAS)

DISTRIBUTION (Figure 6)—Peru north through Ecuador to Colombia, between 2° north latitude and 9° south latitude

NATURAL HISTORY—I collected the topotypical type series by sweeping through emergent vegetation along the margins of the Rio Cosanga and Rio Quijos (the same river; different sections with different names), a river running northward along the eastern slope of the Andes in Ecuador Other paratypes were collected from rocks and other debris at the base of a small waterfall in Peru (Departmento de Huánuco) just before its source stream (unnamed) entered the Rio Huallaga

ETYMOLOGY—The specific epithet, andinus, is a Latinized adjective referring to the general region of the Andes Mountains where the species was collected

REMARKS—Specimens of this species are similar to those of P pallipes but may be distinguished by the following characters: face narrower, not much wider than length of 1st flagellomere; thoracic chaetotaxy better developed, especially dorsocentral bristles anterior of posteriormost bristle; anepimeron with 1 seta; knob of halter brown, contrasted with lighter colored stem; and conformation of the male terminalia, particularly the deeply emarginate, ventral epandrial margin