188 Journal New York Entomological Society, tvoi. xxiv, 



Gall. — A variable, conical outgrowth of the stem with a height of about 

 4 mm. and a basal diameter of 2 to 3 mm. The gall contains basally, an 

 oval, thin-walled cell with a length of 2.75 mm. and a diameter of 1.75 mm., 

 the hollow, distal portion being filled with a slender, thread-like growth of 

 delicate cells placed end to end and forming a rounded or, in some cases, nearly 

 truncate plug. 



Exuvium. — Length 1.5 mm., moderately stout, the anterior thicker por- 

 itons brownish, the thinner parts semi-transparent ; antennal horns short, stout, 

 feebly and unequally bidentate, the antennal cases extending to the base of the 

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

 the fourth and fifth abdominal segments; posterior extremity broadly rounded; 

 the dorsum of the abdominal segments with numerous minute, chitinous points. 



Male. — Length 2.5 mm. Antennae nearly as long as the body, sparsely 

 haired, the basal antennal segments black, the others yellowish; 17 segments, 

 the fifth with a stem three-fourths the length of the cylindric basal enlarge- 

 ment, which latter has a length about one and one-fourth times its diameter; 

 terminal segment somewhat reduced, tapering to a narrowly rounded apex. 

 Palp consisting of one moderately long, stout segment. Head, thorax and the 

 abdomen basally black, the distal segments of the abdomen mostly yellowish. 

 Legs yellowish white or grayish, the tibije and tarsi paler, the coxse and femora 

 darker ; claws slender, strongly curved, the pulvilli as long as the claws. 

 Genitalia ; basal clasp segment moderately long, stout ; terminal clasp segment 

 long, stout ; dorsal plate broad, deeply and triangularly emarginate ; ventral 

 plate moderately long, broad, deeply and roundly emarginate, the lobes rather 

 broad and broadly rounded. 



Female. — Length 1.5 mm. Antennae extending to the fourth abdominal 

 segment, sparsely haired, yellowish gray; 16 segments, the fifth with a length 

 about two and one-half times its diameter ; terminal segment somewhat pro- 

 duced and frequently fused with the preceding. Mesonotum black. Abdomen 

 cherry red, the distal segments and the ovipositor yellowish gray. Halteres 

 yellowish with a white pubescence. Claws strongly curved, the pulvilli longer 

 than the claws. Ovipositor short, with a length about one-fourth that of the 

 abdomen, the terminal lobes orbicular, sparsely setose. Otherwise nearly as 

 in the male. Color characters after Timberlake. Type Cecid. 1614. 



Rhopalomyia glutinosa new species. 



The midges described below were reared May 10, 1913, from a 

 shining, glabrous, cortical swelling on the stem of rabbit brush, 

 Chrysothamnus graveolcns. The female presents many characters 

 in common with that of R. chrysothamni, from which it may be most 

 easily separated by the more reduced terminal antennal segments, 

 the longer ovipositor and the narrowly oval, more setose terminal 

 lobes. 



