ABT. 7 PSYCHODID SUBFAMILY BRUCHOMYINAE ALEXANDER 3 



The generic definition of Bruchomyia must be slightly modified as 

 a result of the discovery of these two novelties. The antennae in 

 number of segments range from 27 to 30, the terminal segment being 

 very small and buttonlike. Tonnoir (1922, p. 127, footnote) sug- 

 gested that the increased number of flagellar segments in Bruchomyia 

 might have been brought about by the bipartition of the 14-seg- 

 mented flagellum in Nemopal'pus. An examination of the three 

 known species oi Bruchomyia shows the impossibility of such an expla- 

 nation, since the segments decrease gradually in size outwardly and 

 there is no suggestion of a pairing of the segments, as would be the 

 case if a primitive segment had been evenly subdivided. The chief 

 venational peculiarity of Bruchomyia is the long sinuous distal section 

 of Cu,. 



The only ecological notes available concerning this genus are those 

 made by Doctor Bruch concerning the genotype, argentina (Alex- 

 ander, 1927). "The flies always occur in damp places, being found 

 on damp earth and in crevices of rocks. Pieces of wood, roots, moss^ 

 and other substances were examined critically, but the early stages 

 could not be discovered. No plant mines were found and the larvae 

 could not be located in the mud and wet earth along the margins of 

 streams. In a position of rest, the adult flies sit rather high-legged, 

 the wings held obliquely divergent. In copula, the male rests 

 on the female, their bodies not being held in opposition. The flies 

 are rather wary and take flight readily when disturbed. However i 

 this flight is of brief duration and one can readily watch such a dis- 

 turbed fly in flight and see it alight again." — Bruch. 



KEY TO THE SPECIES OF BRUCHOMYIA ALEXANDER 



1. General coloration of head and mesonotum dark gray; vestiture of head and 



thorax whitish; antennae (female) 29-P8gmented, the basal segment of 



fiageUum subequal to the second. (Peru.) peruviana, new species. 



General coloration of head and mesonotum brown or yellowish, the vestiture 

 pale brown to dark brown; antennae not 29-segmented, the first flagellar 

 segment approximately one-half longer than the second 2. 



2. General coloration pale yellow, the vestiture pale brown; antennae of male 



2S-segmented, of female 27-segmented, nearly as long as the body; no 

 patch of dark setae on wing-disk at the bend of Rs, the latter not incras- 



sated at this point. (Peru.) shannoni, new species. 



General coloration brown, with brown setae; antennae of male 30-segmented, 

 shorter than the body; a patch of dark setae on wing-disk at the bend of 

 Ri, the latter strongly incrassated at this point. (Argentina.) 



argentina Alexander. 



BRUCHOMYIA ARGENTINA Alexander 



1920. Bruchomyia argentina Alexander, Ann. Ent. Soc. America, vol. 13, p. 405. 



General appearance much like a Molophilus; antennae elongate, 

 30-segmented; a dark patch of setae at r-m. 



The fly was described from La Granja, Alta Garcia, Province of 

 C6rdoba, Argentina, April 1-8, 1920 (Charles Bruch). More recently 



