Sept., i9i6.] Felt: New Western Gall Midges. 191 



Gall. — Monothalamous, somewhat top-shaped, the walls moderately thick 

 and the surface sparsely clothed with a whitish, appressed pubescence, the 

 greatest diameter ranging from 3 to 4 mm. 



Larva. — -Whitish, stout, the posterior extremity rounded, the breastbone 

 rather broad, short, with two long, widely separated teeth, the excavation 

 broadly rounded ; skin coarsely shagreened. 



Male. — Length 2 mm. Antennae nearly as long as the body, rather sparsely 

 long-haired, yellowish brown; 16 segments, the fifth with a stem one-half the 

 length of the cylindric basal enlargement, which latter has a length about 

 twice its diameter; terminal segment somewhat reduced, tapering slightly 

 to a subconical, smooth apex. Palpi ; first segment subquadrate, the second 

 narrowly oval, nearly twice the length of the first, the third nearly twice the 

 length of the second, more slender, the fourth one-half longer than the third, 

 more slender. Mesonotum shining dull reddish brown, the margin sparsely 

 brown-haired. Scutellum brownish, postscutellum yellowish orange. Abdomen 

 coarsely white-haired, mostly dark brown, the incisures yellowish white. Wings 

 hyaline; halteres yellowish transparent. Coxse fuscous yellowish, the legs 

 mostly pale straw, the pulvilli nearly as long as the claws. Genitalia; basal 

 clasp segment long, stout ; terminal clasp segment short, curved, swollen near 

 the middle; dorsal plate long, broadly dilated apically, the rather slender lobes 

 with a narrowly rounded, setose apex and diverging strongly ; ventral plate 

 moderately short, deeply and narrowly incised, the lobes long, rather broad and 

 tapering slightly to a narrowly rounded, sparsely setose apex. Harpes stout, 

 obscurely denticulate distally ; style short. 



Female. — Length 2.25 mm. Antennae extending to the third abdominal 

 segment, sparsely haired, dark yellowish; 18 sessile segments, the fifth with a 

 length one-half greater than its diameter, the terminal segment reduced, roundly 

 and broadly conical. Palpi ; the first segment irregularly subquadrate, the 

 second about as long as the first, the third one-half longer than the second, 

 more slender, and the fourth more slender than the third and about twice as 

 long. Mesonotum shining dark brown. Scutellum yellowish brown, postscutel- 

 lum fuscous yellowish. Abdomen sparsely dark-haired, dark reddish orange, the 

 ovipositor yellowish orange and with a length nearly as long as the abdomen. 

 Halteres yellowish transparent basally, fuscous subapically, whitish apically. 

 Coxae dark brown ; legs mostly dark brown. The lobes of the ovipositor short, 

 roundly triangular and sparsely setose. Type Cecid. a27i3. 



Phytophaga timberlakei new species. 



The midges described below were reared by Mr. P. H. Timberlake 

 in March, 191 5, from branches and limbs of willow, Sali.v fendleriana, 

 collected by J. P. O'Gara near Salt Lake City, Utah, the preceding 

 November. This species resembles P. pcroccuUa Ckll., from which 

 it may be separated by the decidedly shorter antennal stems in the 

 male and the presumably shorter palpi. There are minor differences 



