69 
6. Dorsum of abdomen distinctly marked with gray, nearly bare 7 
Dorsum of abdomen deep black, not marked with gray, quitti <l(Mi8ely elothed 
with nearly erect yellowish tomentum, niesonotum also <lecp black .ind wholly 
covered with apjjressed golden yellow tomentum; pleura grayish black; legs 
nearly bare, yellow, aj)ice8 of femora and of tibia', an<l whole of tarsi except 
the basal tive-sixths of th»^ first joint of the hind ones, brown; first joint of 
front tarsi scarcely dilated, the first Joint of the hind ones one-half as wide as 
their tibia'; bead gray, covered with a pale yellow tomentum; antenua- black, 
the two basal joints yellow, mouthparts black; wings hyaline, costal, first 
three veins and first section of the fourth, yellow, the remainder subhyaline; 
length, 1.5""". Cambridge, Mass. (May 31, 1889), and Los Angeles County, Cal. 
Two females, the one from California captured by the writer. . hractiatnm n. sp. 
7. Fifth segment of abdomen marked with three velvet-black spots, which are some- 
times connected by a narrow black line at the extreme base of the segment. . 8 
Fifth segment, and also the third and fourth, marked Avith a broad velvet-black 
fascia, front corners of the sixth and usually of the seventh segnnsnt also velvet 
black, the middle of these segments brown ; mesonotum gray, marked with 
three black vitt;e, a black dot in front of the insertion of each wing; base of 
first joint of hind, and sometimes of the middle tarsi, yellow, bases of femora 
and tibia; sometimes also yellow; length, 2.5 to 4'""'. Ithaca, N. Y. ; Shovel 
Mountain, Texas, and Wilsons Peak, California pictipes Hagen. 
8. Front and other femora brown, their bases sometimes yellow; mesonotum gray, 
marked v»'ith five black vitt.'c; abdomen gray, bases of segments three to seven 
or eight each marked with a velvet-black fascia produced backward in the 
middle and at the ends ; length, 2 to 4""". Niagara Falls, N. Y. ; Grand Eapids, 
Minn.; Glencoe, Nebr. ; Onaga, Kans., and Wilsons Peak, Cal.. vittatmn Zett. 
Front and middle femora and tibia3 wholly yellow, hind ones except their apices 
also yellow, tarsi brown, bases of the first two joints of the niiddh; and hind 
ones yellow; mesonotum grayish, indications of a darker median vitta, the 
sides and front corners yellow, pleura light gray, scntellum yellow; abdomen 
gray, segments two to six each marked with three velvet-black spots; wings 
hyaline, the costa, first three veins, and first section of the fourth, yellow, the 
others subhyaline; face and front light gray, antenna^ brown, the two basal 
joints yellow, palpi black, proboscis yellowish; length, 1.5""". Colorado. 
Three females, collected by Mr. Carl F. Baker griseum n. sp. 
9. Mesonotum gray at least on the sides and hind margin 10 
Mesonotum wholly velvet black; abdomen with a gray spot on the sides of the 
second, fifth, sixth, and seventh segments, legs almost wholly brown, other- 
wise as in the female. Two male specimens taken with the female (see above 
under 6) hracteatum n. sp. 
10. Center of mesonotum largely or wholly velvet black 11 
Center of mesonotum with a narrow, black vitta, mesonotum elsewhere gray, 
dorsum of abdomen velvet black, the second and seventh segments and a spot 
on the sides of the eighth, silvery gray, otherwise as in the female. A male 
specimen taken with the females (see above under 8) griseum n. sp. 
11. Sides of abdominal segments four to seven, destitute of dense clusters of silvery 
white hairs; mesonotum with a gray streak extending obliquely inward from 
each humerus 12 
Sides of these segments with silvery white hairs, mesonotum destitute of a gray 
streak extending inward from the humeri (see above under 8).. vittatum Zett. 
12. Suprahumeral gray stripes metallic, no metallic spots between them; mesonotum 
not vittate with black (see above under 5) veniistuni Say. 
Suprahumeral gray stripes not metallic, two metallic spots between them, meso- 
notum usually with three black vittaj (see above under 7) pictipes Hagen. 
