296 S. W. WILLISTON. 



MUHCID^ CALYPTRAT.E 



Hyalomyia aeiieoveiitris n. sp. 



3Iale. — Black, abdomen metallic coppery bronze, margined with white pollen ; 

 wings broadly brown anteriorly near the middle; thoi-ax not vittate. Length 

 6 mm. 



Front narrow below the ocelli, with a slender, opaque, black stripe, filling out 

 the front above, a little dilated below, the triangular frontal part lightly polli- 

 nose on the sides, clothed with black hair and bristles. Antennse black, the third 

 joint a little longer than broad. Face and cheeks white pollinose. Dorsum of 

 thorax black, but little shining, faintly pollinose, except, when seen obliquely 

 from behind, there appear an irregular white cross-band before the suture and 

 more or less silvery ])ollen in front of the scutellum ; clothed with black pile. 

 Abdomen broadly oval, depressed, shining dark metallic coppery bronze, less so 

 near the base ; the third, fourth and fifth segments, in well-preserved specimens, 

 conspicuously margined with snowy white pollen ; the short hair black, near the 

 tip with some fine bristles. Legs, black, pulvilli brown. Wings in the middle 

 broadly brown, the distal part, and behind the fifth vein, subhyaline, the base 

 brownish yellow. 



Four specimens, Washington Territory. A female specimen with 

 these, that may possibly be the same, is larger, the third antennal 

 joint smaller, the eyes nearly contiguous below the ocelli, the abdo- 

 men less shining metallic, and the distal part wholly lightly pollinose, 

 except a narrow, median, indistinct stripe (Avhen viewed from behind 

 the pollen and stripe much more distinct). The wings differ very 

 distinctly in being hyaline, with the base and basal veins yellow. 



This genus seems to be well represented on the Pacific coast. I 

 have three other species not well enough preserved for description. 

 One is larger (7 mm.) with broader front, red antennae, and with 

 considerable red on abdomen. The others are small (3 and 4 nun.) 

 and resemble the female mentioned above. The wings in all are 

 nearly hyaline. 



Cistogaster «livisa Loew, Ceutur. iv, 78 ; Gymnosoma occidua Walker, List, 

 etc., iv, 692. 



Walker's species seems only to be the female of Loew's male. It 

 differs very much from the male, as the females of this genus and of 

 Ghjvinosoma usually do ; I have taken them in numbers in Connec- 

 ticut. The head is white, only faintly yellowish on the sides of the 

 frontal stripe ; the dorsum of the thorax is shining black, with three 

 broad white pollinose strij^es ; the abdomen black, with a median pol- 

 linose stripe, and two pollinose cross-bands, the fourth segment chiefly 

 pollinose ; the first and second segments are rarely red on the sides. 

 The male sometimes has the black mai-kings of the abdomen much 



