AMERICAN HYMENOPTERA. 21 



the fourth and following segments of abdomen, fulvo-ferruginous. Length 

 .45 inch. 



Hah. — Nevada. (Morrison). 



Tenthredo lacticincta.— 9-— Black, shining; two spots above inser- 

 tion of antennae, dot at summit of eyes, clypeus, labrum, mandibles except 

 tips, palpi, lower half of cheeks, most of prothorax, large suboblique mark or 

 stripe on pleura, spot above posterior coxae, tegulse, most of legs, and basal 

 plates, lemon-yellow; wings slightly tinged with yellowish, faintly dusky at 

 tips, nervures fuscous, stigma and costal nervure fulvous; tips of intermediate 

 tibiae above and line on posterior femora above sometimes confined to apical 

 half, black, tips of posterior tibiae and the tarsi dull fulvous, or pale fuscous; 

 fourth and following segments of abdomen dull fulvous. Length .45 inch. 



%. — More slender; pleura, except upper margin, and pectus entirely yellow; 

 four posterior tibiae with black line above, posterior tarsi larger and more 

 robust; abdomen above except base of first and second segments pale fulvous, 

 venter yellow at base, shading into fulvous at tip; black spot on disk of basal 

 plates. Length .45 inch. 



Hah. — Nevada. (Morrison). 



Tenthredo suaris. — % . — Head black, eyes large and unusually promi- 

 nent, face narrow ; short line on inner orbit of eyes near summit, most of 

 cheeks, spot between antennae, two tubercles at base above, clypeus, labrum, 

 mandibles except tips and palpi, white; antennae about as long as head and 

 thorax, black, third joint much longer than fourth; thorax white, line on 

 prothorax above, mesothorax, lateral scutellar region, and sutures of pleura 

 posteriorly, black; scutellum, line on postscutellum and tegulae, white; wings 

 subhyaline, nervures and stigma fuscous; legs yellowish-white, black line on 

 femora above, most of posterior tibiae and their tarsi fulvous; abdomen long, 

 narrow, yellowish-white, base of basal plates and of first segment black, apez 

 of fourth and the following segments fulvous. Length .50 inch. 

 Hah. — Nevada, (Morrison). Allied to lacticincta. 



Tenthredo bella. — ^. — Slender, black; clypeus, labrum, mandibles 

 except tips, palpi, spot beneath eyes, posterior angles of prothorax, spot above 

 posterior coxae, tegulae, and basal plates more or less, yellowish-while; scape 

 fulvous beneath; wings tinged with yellowish, nervures fuscous; legs yel- 

 lowish, varied with fulvous, coxae except tips, most of intermediate femora 

 above, posterior pair except base and apex of their tibiae, black; posterior tarsi 

 fuscous; abdomen shining, fourth segment fulvous or ferruginous. Length 

 .40 inch. 



9 var. — Tips of four posterior femora and of their tibiae fulvous; fourth 

 and following segments of abdomen fulvo-ferruginous, shading into fuscous 

 at tip. Length .40 inch. 



Hah. — Colorado, (Morrison). 



Tenthredo luteipes. — 9- — Black; clypeus, labrum, mandibles except 



tips, palpi, spot beneath eyes, posterior angles of prothorax, spot above pos- 

 terior coxae, tegulae, trochanters, femora, tibiae and tarsi beneath, and spot on 

 Bides of basal plates, all straw-white; wings faintly dusky, nervures black; 

 fourth and following segments of abdomen ferruginous. Length .40 inch. 



Hah. — Nevada, (Morrison). 



