30 Annals Entomological Society of America [Vol. VI, 



the thorax black, those on the ^posterior part large, a space on each srde 

 above the humeri and reaching about half way to the root of the wings 

 covered with short black bristles; metanotum black with yellow on the 

 sides. Abdomen yellow with black bands at the base of the second, 

 third, and fourth segments, these bands narrowed laterally, hardly 

 reaching the sides below, and emarginate on the center of the dorsum; 

 fifth segment small, with the ventral sheath black; hairs of the abdomen 

 black, those on the fifth segment, and a few along the sides yellow; 

 hypopygium black or testaceous, small, subquadrate, and rounded 

 behind. Legs pale yellow; front coxae with yellow hairs and bristles; 

 middle coxae with black hairs and bristles; front metatarsi about the 

 length of their tibiae, the four remaining joints together about the length 

 of the first, the fourth joint very shghtly flattened, third joint nearly 

 twice the length of the fourth; hairs on the front tarsi quite long; middle 

 metatarsi about as long as their -tibiae; hind tarsi with the second joint 

 longer than the first. Wings hyaline, hardly tinged with grayish; veins 

 yellowish brown ; posterior cross- vein somewhat oblique. 



Female; I place with the male described above a single female 

 closely related to rubella, but somewhat smaller and with the posterior 

 cross- vein a little oblique; it agrees with the male in all but sexual 

 characters. 



Described from one male in the National Museum collection, 

 taken at Lehigh Gap, Pa., July 23, 1907, by C. T. Greene; and 

 one female sent me by Prof. C. W. Johnson and labeled Capens, 

 Me., July 21, 1901. 



Note. — This is closely related to rubella and nitida, but the 

 male differs from the later by having only a black central line 

 on the dorsum of the thorax, the abdominal bands are emar- 

 ginate, the front tarsi have shorter hairs below, the fourth 

 joint is very slightly flattened, and the posterior cross-vein is 

 twice its length from the wing margin measured on the fifth 

 vein, in nitida it is less than twice its length from the margin 

 and the fourth joint of front tarsi is cylindrical. From rubella 

 it differs in having the front of the wing less arched; all the tarsi 

 are darkened from the base a little, but the dark part not as 

 distinctly marked as in rubella, the front metatarsi are about 

 the same length as their tibiae while in rubella they are very 

 distinctly longer. In rubella the third and fourth joints of the 

 front tarsi are about equal while in this species the third is 

 nearly twice as long as the fourth. This species is a little 

 smaller than rubella and the posterior cross-vein is a little 

 oblique while in rubella it is perpendicular to the fifth vein. 

 It differs from dimidiata by having black hairs and bristles on 

 the middle coxae, while dimidiata has only yellowish hairs and 



