AMERICAN IIYMENOPTERA. 23 



Tenthredo morosa. — %. — Dull black; tips of mandibles ferruginous; 

 palpi pale; femora, tibise and four anterior tarsi, except black line above fer- 

 ruginous; posterior tarsi black; wings pale smoky, subviolaceous, nervurei 

 black; abdomen ferruginous, basal plates, first segment, and stains at sides of 

 the two or three following segments black. Length .43 inch. 

 Ilab. — Colorado, (Morrison). 



Teuthredo rubeola. — "^ .^Short, black; two spots on clypeus, labnrn, 

 spot beneath eyes, mandibles except tips, palpi, two spots on pectus, all the 

 coxae and trochanters beneath more or less, and the four anterior femora 

 beneath, white; wings fuscous, violaceous, nervures black; posterior femora, 

 tips of intermediate tibiae, and all the tibiae and tarsi ferruginous, posterior 

 tarsi more or less dusky; abdomen ferruginous, basal plates black. Length 

 .35 inch. 



Hab. — Nevada, (Morrison). 



Tenthredo inimula. — %. — Dull black; spot beneath eyes, sometimes 

 wanting, clypeus, labrum, mandibles except tips, palpi, sometimes line on 

 pleura, or two spots on pectus, or spot above posterior coxae, white; wings 

 smoky hyaline, subviolaceous ; legs ferruginous, anterior pair and coxae beneath 

 paler, posterior coxae above, line on all the femora above and posterior tibiae 

 and tarsi entirely, black; abdomen ferruginous, with base and apex black; 

 sometimes black with only the middle of segments 2—4 ferruginous. Length 

 .40 — .45 inch. 



Hab. — Colorado, (Morrison). 



Tenthredo occidentalis.— 9-— Black; clypeus. labrum, mandibles 

 except tips, palpi, posterior angles of prothorax, spot above posterior coxae, 

 tegulae, tips of anterior coxae, line on four anterior femora, tibiae and tarsi 

 beneath, and sometimes a spot on sides of basal plates, all white ; wings faintly 

 dusky, nervures and stigma black, the latter pale at base; fourth and fifth seg- 

 ments of abdomen above more or less ferruginous. Length .40 — .45 inch. 

 Hub. — Colorado, (Morrison). Allied to piceocincta Norton. 



Tenthredo lateraria.— 9 .— Black ; face beneath antennae abruptly 

 declivous; anterior orbits continued beyond summit of eyes and curved in- 

 wardly, face beneath antennae, most of cheeks, clypeus except basal suture, 

 labrum, spot at base of mandibles, palpi, upper lateral margin of prothorax, 

 scutellum, line on postscutellum, ovate spot on pleura, two spots above middle 

 coxae, tegulae, tips of coxae, remainder of legs except tips of tibiae and more or 

 less of tarsi, and broad lateral apical margin, pointed within, of each abdominal 

 segment, all dull yellowish-white or luteous; clypeus deeply and squarely 

 emarginate; antennae scarcely as long as head and thorax, third joint longer 

 than fourth; wings tinged with yellowish, stigma fuscous, pale at base. 

 Length .40 inch. 



Hab. — California, (H. Edwards). 



Tenthredo addenda.— 9 .—Form rather short, broad, depressed, black, 

 shining; narrow anterior orbits, interrupted before summit, broad posterior 

 orbits not reaching summit, middle of face, clypeus, labrum, base of mandibles, 

 palpi, broad upper margin of prothorax, spots on pectus, tegulae, oblique spot 

 on sides of pleura, line on posterior margin, spot above intermediate coxae, 



