XXXI, *20] ENTOMOLOGICAL NEWS 217 



conspicuous light yellow longitudinal stripe; wings with a faint brownish 

 tinge, the stigma very faint; male hypopygium with the intermediate 

 pleural appendage narrow basally, gradually widened, the acute outer 

 angles subequal. 



o*. Length about 5 mm.; wing 5.5 mm. 



Rostrum and palpi dark brown. Antennae dark brown. Head light 

 gray, with an indistinct, darker, median line. 



Pronotum dark brown, the lateral margins narrowly pale yellow. Meso- 

 notal praescutum light brownish gray, with three dark brown stripes; 

 scutum brownish gray, each lobe with two brown spots; scutellum and 

 postnotum dusted with gray. Pleura dark brown; a conspicuous light 

 yellow longitudinal stripe across the dorsal portions of the mesosternum, 

 extending from behind the fore coxae to dorsad of the hind coxae; cephalic 

 portion of the mesepimeron yellow; dorsal pleurites dusted with gray. 

 Halteres light yellow, the knobs brown. 



Legs with the coxae reddish brown; trochanters dull yellow; remainder 

 of the legs obscure yellow; the tarsi darker. 



Wings with a faint brown tinge; stigma very faint, slightly darker 

 brown; veins dark brown. Venation: Sc2 some distance from the tip 

 of Sci, immediately beyond the origin of Rs; Rs but slighly arcuated, 

 about as long as Z?2+j and R2 taken together; r indistinct, inserted at 

 about midlength of R2+3; cell ist Mz open; basal deflection of Citi 

 before the fork of M, this distance being about one-half the deflection. 



Abdomen dark brown, the posterior margins of the segments indis- 

 tinctly paler. Male hypopygium with the pleurites having three ap- 

 pendages, the outermost flattened, the short apex produced into an acute 

 point that is directed at a right angle to the remainder of the blade, some- 

 what like the beak of a bird; the intermediate appendage is slender basally, 

 gradually dilated into a fanlike structure, the outer margin concave, the 

 lateral angles thus formed produced into acute or subacute, subequal 

 points; inner pleural appendage a pale, flattened lobe that is gradually 

 widened to just before the apex, the tip obtuse. Penis-guard distinctly 

 trifid at apex. 



Habitat: Argentina. 



Holotype, cf, Rioja, February, 1915, (E. Giacomelli). 

 Allotopotype, I 9 , in poor condition. 



This fly is allied to G. velutina Alexander, G. iveiseri new 

 species, and other members of the subgenus in the Neo- 

 tropical fauna but is readily told by the- structure of the 

 male hypopygium. 



Gonomyia (Leiponeura) bruchi new species. 



Antennae black, the scapal segments largely yellow; head yellow, the 

 vertex with a brown blotch; thorax yellow, marked witli brown; llioi.nie 



