Dec, 1902.] COQUILLETT : NeW NoRTH AMERICAN DiPTERA. 191 



A single specimen collected August ii by Mr. H. S. Barber. 

 Type No. 6661, U. S. N. M. 



Phytomyza palliata, sp. nov. 



Yellow, an ocellar dot, occiput except lower margin, and mesonotom except the 

 sides and hind margin, black, center of sternopleura and bases of abdominal segments, 

 brownish ; bristles black ; mesonotum opaque, gray pruinose, bearing only a few 

 hairs, four pairs of dorsocentrals ; wings hyaline, fourth vein as strong as the third, 

 hind crossvein wanting. Length, 1. 5 mm. 



Habitat. — Mesilla Park, New Mexico. 



A single specimen bred from Portulaca August 10 by Prof. T. D. 

 A. Cockerell. Type No. 6662, U. S. N. M. 



Phytomyza bicolor, sp. nov. 



Black, the labella, halteres and abdomen except the last segment and base 

 of the preceding, yellow ; thorax thinly grayish pruinose, four pairs of dorso- 

 central bristles, the hairs between them numerous, not arranged in rows ; wings 

 hyaline, veins yellowish, fourth vein subhyaline, noticeably more slender and less dis- 

 tinct than the third, hind crossvein wanting. Length, 3 mm. 



Habitat. — Niagara Falls, New York. 



A single specimen collected June 23 by Mr. C. W. Johnson. 

 Type No. 6663, U. S. N. M. 



NEW FORMS OF CULICIDiE FROM NORTH 



AMERICA. /O 



By D. W. Coquillett. 



Corethrella, gen. nov. 



Near Corethra and Mocklonyx, but diflering from both in having the antennae 

 wholly covered with hairs and the apical joints shorter than the intermediate ones. 

 Antennae 14-jointed, the first joint unusually large, bulbous, twice as wide as long, 

 the remaining joints slender, elongate, wholly covered with hairs, which are very 

 dense in the male but very sparse in the female, in both with a sparse whorl of bris- 

 tles near base of each joint, the second joint with an additional whorl before the 

 middle, the hairs and bristles noticeably sparser and shorter on the last three joints 

 than on the preceding ones, hairs on the sixth joint in the male over four times as 

 long as that joint and but slightly shorter than the bristles, in the female the longest 

 hairs on the sixth joint are about half as long as that joint and about one-fourth as 

 long as the bristles, antennae only slightly thickened at the insertion of the whorls 

 of bristles, second joint slightly longer than the third, about four times as long as 

 wide, joints three to eleven becoming successively a trifle longer, the last three 



