Mesorhaga cocori, 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 : 54-55

Mesorhaga cocori n. sp. ( Fig. 1 d)

Type material. Holotype ɗ, COSTA RICA: LIMó N: Sector Cocori , 30 km al Nortede Caiari, A.C. Tortuguero, 100 m, xii.1993, E. Rojas ( INBIO -CR1001647246); paratype, Ψ, same but 22.ix.-23.xi.1993 ( INBIO)

Additional material: possible females: COSTA RICA: 2 Ψ, GUANACASTE: P.N. Rincón de la Vieja, Est. Las Pallas, 800 m, 17–25.vii.1993, K. Taylor & D. Garcia; Ψ, ALAJUELA: P.N. Arenal, San Carlos, Sendero Pilón, 650 m, 1–18.v.1999, Malaise trap, G. Carballo ( INBIO).

Description. Male: body length: 5.0 mm; wing: 5.0 x 1.8 mm.

Head: 3 strong postvertical setae present as continuation of postocular row; strong proclinate vertical present on lateral frons; vertex, frons, face, and clypeus dark metallic blue-green, and with orientated silvery pruinosity; clypeus narrowed distally and adjacent to margins of eyes; palp dark brown with black apical seta; proboscis dark brown; antenna black; arista dorsal, about as long as head height; ventral postcranium with abundant black setae.

Thorax: metallic green with bronze reflections; setae black; pleura with some grey pruinosity; 3 pairs long ac present, with shorter, paired setulae anteriad; lateral scutellar setae almost half as long as median setae.

Legs: all coxae, trochanters, femora, and all leg III dark brown to black; tibia and basitarsi I and II yellowish; distal tarsomeres I and II dark brown; CI and CII with black anterolateral setae; CIII with strong, black lateral seta and some shorter setae; femora with av and pv rows of black setae. I: 5.0; 5.1; 2.7/ 1.0/ 0.7/ 0.6/ 0.5; TI distally with posterior rows of black setae; It1–2 with posterior row of long setae (MSSC); It3–5 with long dorsal setae; It5 only slightly expanded and with pulvilli slightly expanded. II: 6.0; 7.0; 4.0/ 1.6/ 1.2/ 0.7/ 0.6; TII bare of major setae except for apicoventral seta. III: 7.5; 8.2; 3.3/ 2.8/ 1.5/ 0.8/ 0.5.

Wing: (similar to M. lacrymans , Fig.1 c); also with dark brown clouding; vein M with gentle right-angle curve at 1/3 between dm-cu crossvein and wing apex; CuAx ratio: 1.3; lower calypter dark brown with black rim, and fan of black setae; halter stalk dark brown, club black.

Abdomen: tergum 1 metallic blue-green, with short, dark setae dorsally; terga 2–6 black with metallic violet reflections, with black vestiture; terga 4–5 with long black ventral setae near lateral margins; sternum 8 with long setae; hypopygium ( Fig.1 d) black; phallus and hypandrium elongate and narrow; epandrial lobe broadly ovate, with strong setae at 1/2 and 3/4; surstylus with setae as figured; cercus curved and only slightly expanded, with some strong apical setae.

Female: smaller, wing 3.5 x 1.3 mm; setae on head, antenna and thorax not as strongly developed; leg coloration similar.

Remarks. Mesorhaga cocori is known from rather low elevations in Limón province on the Caribbean coast(and possibly from females elsewhere in Costa Rica). It is close to M. lacrymans in genitalic structure (especially note the similarity of cerci, Figs 1 a & 1d) and overall body habitus. The specific epithet cocori is a place name of indigenous origin and should be regarded as a noun in apposition.

Figures

FIGURE 1. Mesorhaga lacrymans Parent: a. hypopygium, left lateral. b. male distal tarsus I, dorsal. c. male wing, dorsal. M. cocori n. sp.: d. hypopygium, left lateral. M. sarukhani n. sp.: e. hypopygium, left lateral. M. funebris Parent: f. hypopygium, left lateral. M. hule n. sp.: g. hypopygium, left lateral.