Mesorhaga nayaritensis, Bickel, Daniel J., 2007

Bickel, Daniel J., 2007, The Mesoamerican Mesorhaga (Diptera: Dolichopodidae), with a taxonomic conspectus of the New World fauna, Zootaxa 1411, pp. 47-67 : 64-66

Mesorhaga nayaritensis n. sp. ( Fig. 4 b)

Type material. Holotype ɗ, Mexico: NAYARIT, Acaponeta, 15.viii.1960, P.H. Arnaud, E.S. Ross, & D.C. Rentz ( CAS).

Description. Male: body length: 3.6 mm; wing: 3.0 x 1.2 mm.

Head: 2–3 strong postvertical setae present, in line with postoculars; strong proclinate vertical present on lateral frons; vertex, frons, face, and clypeus metallic bronze, covered with silvery pruinosity; clypeus narrowed distally and adjacent to margins of eyes; palp bown with black seta; proboscis yellow; antenna black; 1st flagellomere subcircular with dorsoapical arista; ventral postcranium with abundant pale setae.

Thorax: metallic green with bronze reflections; pleura with some grey pruinosity; ac as two irregular pairs of long setae; lateral scutellar setae about one quarter length of medians.

Legs: all coxae brown with metallic green reflections; trochanters brown; all femora and tibiae, and basitarsi I and II yellow; distal tarsomeres I and II and all tarsus III brown; CI and CII with whitish anterior and black distolateral hairs; CIII with some whitish lateral hairs and black lateral seta; femora with pale ventral hairs. I: 3.3; 3.2; 1.6/ 0.7/ 0.4/ 0.3/ 0.3. II: 3.8; 4.3; 2.7/ 1.0/ 0.8/ 0.6/ 0.4; TII with only short setae. III: 5.3; 5.9; 1.9/ 1.5/ 0.9/ 0.6/ 0.3; TIII with some short dorsal setae.

Wing: hyaline; M with gentle curve at 1/2 between m-cu crossvein and wing apex; CuAx ratio: 0.7; lower calypter pale yellow, with black rim and fan of black setae; halter yellow.

Abdomen: metallic green with bronze reflections, covered with short dark setae dorsally and pale setae laterally; dark, bronze-brown bands on tergal overlap of segments 2–6; hypopygium ( Fig. 4 b) dark brown; hypandrium with apical hood slightly expanded; epandrial lobe subrectangular, with 2 setae on distal surface and strong seta near base; surstylus with setae as figured; cercus only slightly curved, distally clavate, with short medial thorn-like setae and some long subapical setae.

Female: unknown.

Remarks. Mesorhaga nayaritensis is known only from its lowland type locality in Nayarit, Mexico.

Figures

FIGURE 4. Mesorhaga minatitlan n. sp.: a. hypopygium, left lateral. M. nayaritensis n. sp.: b. hypopygium, left lateral. M. caudata Van Duzee: c. male postabdomen, left lateral; d. male postabdomen, dorsal.