1921] NATURAL SCIENCES OF PHILADELPHIA. 83 



face more reddish; flagellum dark brown. The thoracic pleura is 

 largely pale yellow, snowy-white pollinose, this appearing as an 

 ill-defined, very broad, longitudinal stripe. Halteres brown, the 

 base pale, the knobs yellow. Legs with the coxae brown; trochanters 

 more testaceous; remainder of the legs brown. Wings grayish sub- 

 hyaline; veins pale brown. Venation: Sc rather short, ending 

 some distance before the origin of Rs; R2+3 nearly straight, at the 

 outer end curved suddenly cephalad; basal deflection of Cui just 

 before the fork of M. Abdomen dark brown, the sternites paler. 

 Male hypopygium (Plate IV, Fig. 4, 4A) with the pleurites rela- 

 tively short and stout; two pleural appendages borne at the extreme 

 apices of the pleurites; these appendages are very similar to one 

 another in general shape but the outer one is slightly larger than 

 the inner one. They appear as pale, cylindrical, gently curved 

 appendages, the tips suddenly narrowed into powerful blackened 

 spines; before the blackened tips with three or four small setae. 

 The penis-guard is relatively long and slender, tapering gradually 

 to the apex. The two patches of spines borne by G. phoroctenia 

 and allies are here represented by two pads of delicate appressed 

 setae, no spines being evident. 



Habitat. — Peru. 



Holotype, d^, Iquitos, May 25, 1920 (H. S. Parish). 



Gonomyia (Leiponeura) spicata sp. n. Plate IV, flg. 3. 



Rostrum brownish black; antennal scape yellowish, flagellum 

 black; thoracic pleura brown with a broad, conspicuous, yellowish 

 white longitudinal stripe; knobs of the halteres yellow, male hypo- 

 pygium with two pleural appendages, the ventral appendage being 

 a powerful, chitinized spike with the tip prolonged into an acute 

 point; the dorsal appendage is very small and fleshy; gonapophyses 

 and penis-guard arranged in pairs. 



Male. — ^Length about 3 mm.; wing 3.2-3.3 mm. 



Rostrum and palpi brownish black. Antennae with the scapa- 

 segments yellow, the flagellum black, the segments with conspicuous 

 verticils. Head yellow, the vertex marked with dark brown. Mesol 

 notum brown, narrowly yellowish laterally; median area of the 

 scutum broadly yellow; scutellum broadly obscure yellow behind; 

 postnotum obscure yellow anteriorly, passing into brown on the 

 caudal half. Pleura brown, the dorso-pleural membranes and the 

 posterior sclerites light yellow; a broad, conspicuous yellowish white 

 longitudinal stripe extending from the fore coxae to the base of 

 the abdomen, passing immediately beneath the base of the halteres. 

 Halteres light brown, the knobs yellow. Legs with the fore coxae 

 yellowish on the outer face; middle and hind coxae with the outer 

 faces infuscated basally, sparsely pruinose; trochanters light brown; 

 remainder of the legs brown. Wings with a strong brownish tinge, 

 the costal and subcostal cells paler; veins pale brown. Venation: 

 Sci ending opposite the origin of Rs, Sd rather close to the tip, 



