Sept., i9i6.] Felt: New Western Gall Midges. 179 



The face, the occipital margin on the top and sides of the head, a triangular 

 spot on the propleura, a small spot below the insertion of the wings, and a 

 narrow sclerite between the middle and hind coxas, creamy white ; the neck 

 yellowish with a narrow, longitudinal, blackish sclerite on each side. Meso- 

 notum, scutellum and postscutellum slate-colored. Abdomen sparsely clothed 

 with light brown or reddish hairs, black ; pleura brownish yellow. Wings hya~ 

 line, the legs blackish, except that the posterior tibiae and tarsi are brownish ; 

 claws stout, evenly curved, the pulvilli as long as the claws. Ovipositor about 

 as long as the abdomen. 



Male. — Length 3.5 mm. Antennae nearly as long as the body, sparsely 

 haired, blackish; 14 segments, the third with a length five times its diameter, 

 and the fourteenth with a length over three times its diameter. Palpi; first 

 segment i.rregularly quadrate, curved, with a length over twice its diameter, 

 the second segment slender, tapering and more than twice the length of the 

 first. Color very similar to that of the female but the abdomen is more slate- 

 colored like the thorax, the pleurae being reddish, the hind tibia and the first 

 tarsal segment blackish, the four distal tarsal segments being paler. Basal 

 clasp segment short, very stout; terminal clasp seginent short, greatly swollen, 

 bidentate, the teeth very asymmetrical ; dorsal plate moderately long, divided, 

 the lobes tapering roundly to a narrowly rounded, thickly setose apex. Color 

 characters after Timberlake. Type Cecid. 161 3. 



Asteromyia gutieirezise new species. 



The midges described below were reared by Mr. P. H. Timber- 

 lake in May and June, 1914, from a black, blister-like gall on the 

 slender flower stems of Giitierrezia sarothrac, collected near Salt 

 Lake City, Utah. The species produces a gall very similar to that of 

 Asteromyia carbonifera Felt and the adult presents many characters 

 in common with this widespread eastern species, from which it is 

 most readily separated by the third vein uniting with costa near the 

 distal third and the moderately stout, obtuse harpes with a conspicu- 

 ous, eccentric, quadrate, chitinous tooth. In the eastern C. carboni- 

 fera the third vein unites with costa near the basal half, while the 

 harpes taper to a decidedly slendex apex bearing a conspicuous, quad- 

 rate tooth. The insect hibernates in the gall and Mr. Timberlake is 

 of the opinion that there may be two generations annually, since he 

 has reared the insect in numbers during May and June and in Sep- 

 tember observed galls on new growth showing pupal exuvi?e, these 

 latter being indications of a second brood. 



Gall. — Irregular, dull black thickenings of the slender flower stems, rang- 

 ing in length from 6 to 8 mm. and approximately doubling the thickness of 

 stems, with a diameter of .5 mm. Except for its location the deformation is 

 very similar to that of C. carbonifera. 



