280 EDWARD NORTON. 



iind apex black; cox^x? half the leiii^th of abdomen, ppurs of posterior 

 tibi;T? very long-, les^s black, anterior pair before and a spot on posterior 

 tibijie whitish ; posterior tarsi ferruginous in part; wings subviolaceous, 

 nervures black, lanceolate cell closed. 



Cape Mendocino, Cal., (Cambr. Mus. Coll. by A. Agrssiz, Jr.) 

 It will doubtless be thought that, in this genus and in Ttnlhredo, 

 an unnecessary number of species has been formed, especially as some 

 of the variations seem very slight. But they are very distinct and ap- 

 pear to be permanent. At some future time, when our species are bet- 

 ter known, they can probably be grouped to advantage by certain affi- 

 nities of form and color, which are not so easy to define at present. 



Section 2. {Pachvprotasis) , Ilartig. 

 Tenthredo {All), Fam. IV, King. 



Anteinije longer tlian to base of abdomen, setaceous. Lanceolate cell with 

 short, straight cross line or closed. 

 ?.0. M. (Pachyprotasis) Omega, n. sp. 



Black ; two lines enclosing ocelli, mouth, cheeks, tegulae, V-spot, scutel, three 

 spots on pleura, a s])ot on pectus and most of venter white. Length 0.26. Br. 

 wings 0'56 inch. 



$ . Body rather stout, cylindrical, shining black ; antenna) two- 

 thirds the length of body, slender, thii-d joint scarcely longer than 4th. 

 the basal joint white beneath; two lines extending from sutures of 

 vertex near occiput down inner orbits to mouth, two lines above anten- 

 nae, face below and cheeks, straw-white ; tegula), hinder and lower 

 edge of anterior angle. A^-spot, scutel, a large irregular spot like an to 

 on pleura, spot on breast and part of venter straw-white ; all the coxa; 

 (except a slender line on hinder pair and their base above), the tro- 

 chanters, the four anterior legs (with a black line above) and basal 

 half of posterior femora whitish, remainder black; wings faintly cloud- 

 ed, lanceolate cell rather widely closed in middle. 



% . The male has the antennae very long and slender, basal lialf 

 white beneath, abdomen slender. 



Massachusetts, (Coll. Am. Ent. Soc.) ; Connecticut, Labrador, (A. 

 8. Packard, Jr.); Wisconsin and Lake Saskatchewan, (Smiths. Inst.) 



Five specimens. 



[to be continued.] 



