AET.22 LITTLE KNOWN DIPTERA ALDEICH 23 



Abdomen brilliant green without any pollen, the bristles erect and 

 numerous, erect bristly hairs between them in the middle region. 

 Genital segments rather small, somewhat greenish, both with nu- 

 merous erect hairs, which arelargely on the second. Genitalia black, 

 the inner forceps united into a slender shining beak, its tip bent 

 backward but with a very minute hook forward, the outer forceps 

 also slender and about as long as the inner, also with microscopic 

 hook at tip. Fifth sternite rather prominent, the lobes brown, not 

 with any remarkable spines or other stuctures. Legs black, the fem- 

 ora with metallic green reflections, the tibiae more or less yellowish 

 in the middle, especially the hind ones. Middle tibiae with three 

 bristles on outer front side, hind tibiae with irregular cilia mixed 

 with longer bristles on the outer side. All the claws and pulvilli 

 greatly elongated, the latter light brown. Wings uniformly infus- 

 cated, third vein with small setules extending about halfway to the 

 cross vein. 



Length, 7. 5 mm. 



Described from one male collected at Yellow Dragon Gorge, near 

 Songpan, Szechuen, China, in late July, 1924, by Rev. D. C. Graham. 

 The altitude of this gorge is from 12,000 to 14,000 feet, and the 

 region is strikingly palaearctic. 



TVpe.— Cat. No. 28931, U.S.N.M. 



PSILONEURA, new genus 



Third vein without any bristles at base; first posterior cell ending 

 in the apex, closed or slightly open, back of head with only black 

 hairs. Abdomen broad and rather flat, with numerous erect bristles 

 which occupy the middle of the first and second and the whole of 

 the third and fourth segments and are irregularly arranged. Scu- 

 tellum with three pairs of marginal bristles of equal size and all 

 equally diverging, besides a lateral basal pair higher up and a discal 

 pair. Front decidedly prominent, face receding, back of head bulg- 

 ing below, cheek fully one-half the eye height; lower edge of head 

 sloping upward to the vibrissae; facial ridges and parafacials bare. 

 Eyes distinctly but not densely hairy; proboscis and palpi normal. 

 Tliird antennal joint hardly longer than second; penultimate joint of 

 arista short, beadlike; last joint strikingly enlarged at the extreme 

 base. Ocellars proclinate, divergent; frontals in a single row, the 

 uppermost divergent in female, erect in male, the lowest hardly reach 

 ing the middle of the second antennal joint. 



Type of genus. — Psiloneura jiavisquama, new species. 



PSILONEURA FLAVISQUAMA, new species 



Male. — Entirely black, including antennae, palpi, and legs, the 

 wings, however, with venation yellow at base and the squamae and 



