Sept., i9i6.] Felt: New Western Gall Midges. 185 



distal two segments brownish and the basal portion of the genitalia gray. 

 Coxae black, legs brownish, the claws moderately stout, strongly curved, the 

 pulvilli nearly as long as the claws. Genitalia ; basal clasp segment stout, 

 moderately broad, the basal third with scattered, subconical tuberosities ; ter- 

 minal clasp segment moderately stout, tapering, strongly curved ; dorsal plate 

 deeply and triangularly incised, the lobes broadly rounded ; ventral plate in- 

 distinct ; harpes long, broad, the distal margin narrowly rounded and sub- 

 apically a chitinous ridge with three or four quadrate teeth ; style long, nar- 

 rowly rounded apically. 



Female. — Length 2.25 mm. Antennae extending to the base of the ab- 

 domen, sparsely haired; 15 sessile segments, the fifth with a length two and 

 one-half times its diameter; terminal segment somewhat produced, with a 

 length about three times its diameter, the apex narrowly rounded. Palpi ; 

 first segment irregular, quadrate, the second broadly and irregularly oval. 

 Ovipositor probably nearly as long as the abdomen, the terminal lobes narrowly 

 oval and finely pubescent. Coloration nearly as in the male. Color characters 

 after Timberlake. Type Cecid. 1624, C. 1626. 



Rhopalomyia ampuUaria new species. 



A few midges were reared July 6, 1913, by Mr. P. H. Timberlake 

 from a flask-shaped leaf gall on sage bush, Artemisia tridentata, 

 taken near Salt Lake City, Utah. This species may be distinguished 

 from related forms by the uniarticulate palpi and the small number 

 of antennal segments. 



Gall.- — -A somewhat flask-shaped or subconical, solitary or confluent white 

 pubescent leaf gall, diameter at base 2 mm., height 3 mm. A section shows 

 the basal portion of the gall to be thick-walled, with an oval cell having a 

 length of about 1.5 mm. and a distal tubular, thin-walled portion separated 

 from the larval cell only by a thin, matted layer of filaments, the top being 

 lightly filled with a curled, woolly mass. 



Exuvium. — Length 2 mm., moderately stout, the thicker, chitinous por- 

 tions slightly colored, the other parts semi-transparent ; antennal horns rudi- 

 mentary, represented by rounded processes ; antennal cases extending to the 

 second abdominal segment, the wing cases to the third, and the leg cases to 

 the fifth ; posterior extremity broadly rounded. 



Female. — Length 2.5 mm. Antennje extending to the base of the ab- 

 domen, sparsely haired; 15 sessile segments, the fifth with a length two and 

 one-half times its diameter ; terminal segment somewhat reduced, tapering to 

 a narrowly rounded apex. Palp consisting of one moderately long, stout, ■ 

 fusiform segment with a few stout setae apically. Mesonotum reddish brown. 

 Scutellum yellowish, postscutellum a little darker. Abdomen yellowish orange, 

 the ovipositor yellowish. Halteres pale yellowish. Legs pale straw ; claws 

 moderately stout, strongly curved, the pulvilli as long as the claws. Oviposi- 

 tor about one-half the length of the abdomen, the terminal lobes narrowly 



