1921] NATURAL SCIENCES OF PHILADELPHIA. 81 



strong brownish tinge; cord and outer end of cell 1st Mi seamed 

 with slightly darker brown; stigmal region barely darkened; veins 

 brown. Venation: Sc relatively long, Sci ending immediately be- 

 fore the origin of Rs, Sd a short distance from the tip of Sci, Sci 

 alone being a little longer than the outer deflection of Ms; Rs slightly 

 sinuous; R2+3 nearly straight; cell Ri nearly parallel-sided. Ab- 

 dominal tergites brown, the sternites a little paler. Male hypo- 

 pygium (Plate IV, Fig. 7) with the pleurites long and slender, clothed 

 with erect bristles of which two or three on the outer distal end 

 are very long; a single pleural appendage, this roughly subcircular 

 in outline, entirely pale, the inner face produced proximad into 

 a large, pale, compressed bristle or fascicle of bristles; surrounding 

 this powerful bristle are about five smaller setae. The penis-guard 

 and gonapophyses form a powerful cylindrical mass that occupies 

 about all of the genital chamber; the penis-guard is long and slender, 

 sinuous, as in the manca group of the subgenus. Of the gona- 

 pophyses the two longest are unequal in size, both blackened apic- 

 ally, elongate, flattened, with one margin serrulate; at the base of 

 these appendages is a- small, powerful black tooth with numerous 

 plush-like hairs at its base. What appears to be projections of the 

 ninth tergite are cylindrical arms tipped with a palmate cluster of 

 about eight powerful spines, the more lateral of these shorter, gradu- 

 ally lengthening proximad, the innermost being replaced by abun- 

 dant long bristles. 



Habitat. — Peru. 



Holotype, d", Iquitos, May 18, 1920 (H. S. Parish). 



Gonojnyia phoroctenia, together with two other species described 

 at this time, G. ctenophora and G. crepuscula, form a group of three 

 very closely related species with the general body coloration very 

 similar but the details of structure of the male hypopygium strik- 

 ingly different. To these there should probably be added G. hi- 

 spinosa sp. n., although in this form there are two pleural append- 

 ages and the comb on the ninth tergite is reduced to a pad of deli- 

 cate appressed setae. 



Gonomjria (Leiponeura) ctenophora sp. n. Plate IV, fig. 6. 



Male. — Length about 3.8 mm.; wing 3.5 mm. 



Generally similar to G. (L.) phoroctenia sp. n., differing as follows: 

 Size slightly smaller. Scutellum even more brownish yellow behind. 

 Dorso-pleural membranes and pleural stripe brighter yellow. Wings 

 a little narrower and paler. Male hypopygium (Plate IV, Fig. 6) 

 with the pleurites long and slender, clothed with long bristles that 

 become longer toward the apex of the sclerite on the outer face; 

 a single pleural appendage, this roughly cylindrical in form with a 

 conspicuous blackened spine on the outer margin near midlength; 

 the narrowed cylindrical tip produced into a bristle or fascicle of 

 bristles; a few additional setae are grouped on this narrowed apex. 

 The penis-guard and gonapophyses are not as large or complicated 



