84 INSECUTOR INSClTIit MENSTRUUS 



but not so polished. Tibiae with a faint brownish tinge. Wings very 

 faintly infuscate, almost hyaline, basal-cell area infuscated. Both scales 

 of tegulae deep smoky-black. 



This species strongly duplicates the coloration and general habitus of 

 Gahanimyia h^stricosa and G. polita. The wings are haurdly more per- 

 ceptibly infuscate. 



Euhystricia, new genus. 



Differs from Brauer and Von Bergenstamm's characterization of Hys- 

 tricia by having third antennal joint of male two and one-fourth times as 

 long as the moderately elongate second joint ; second aristal joint elon- 

 gate, two or more times as long as wide, first joint short ; palpi very short, 

 distinct, subcylindrical, about four times as long as thick, bristly. The 

 eyes are densely pilose. Description is from male only. Epistoma not 

 strongly produced. Male front at vertex about three-fourths of eye-width ; 

 ocellar bristles present, proclinate-divaricate ; proboscis stout, part beyond 

 geniculation about one-half head-height ; cheeks of male nearly one-half 

 eye-height ; parafacials moderately wide, bare ; third antennal joint of 

 male quite evenly broadened. 



Three stemopleural, three postsutural, three postacrostichal, and three 

 pre-acrostichal bristles. Scutellum and abdomen densely beset with sub- 

 spinelike macrochaetae, those of abdomen being slightly curved, those of 

 scutellum almost straight but very slender. Four ordinary marginal macro- 

 chaetae on scutellum, the next to front pair shorter than the others. 

 Ventral plates with bristles only ; no spines. Abdomen much shortened 

 and rounded, subglobose-convex above, short-oval. Claws of male long, 

 the front and middle ones longer than last tarsal joint, the hind ones 

 shorter than others. Apical cell well open quite a little before wingtip. 

 Apical cross vein gently bowed in at base, fourth vein continued in long 

 stump reaching about halfway to margin of wing. 



Reproductive habit, probably larviposition of colored maggots. 



Type, Euhystricia nigra, new species. 



Euhystricia nigra, new species. 



Length of body, 1 0.5 mm. ; of wing, 1 mm. One male, Casahuiri, 

 San Gaban Canyon, about 4,500 feet, February 4, 1910, on flowers of 

 Mikania sp. 



Wholly black, subshining ; face, parafacials, cheeks, and occiput sil- 

 very, occipital pile silvery-white ; parafrontals and thorax thinly silvery, 



