2. TEICHIOSOMA. 11 



6. Trichiosoma triangulum. 



Trichiosoma triangulum, Kirb. Faun, Bor.-Amer., Ins. p. 251 (1837); 



Nort. Trans. Amer. Ent. Soc. i. p. 48 (1867). 

 Tricliiosoma bicolor, Nort. P. Host. Soc. viii. p. 150 (1861). 

 Trichiosoma triangulum, Tar. aleutiana, Cress. Trans. Amer. Ent. 



Soc. viii. p. 1 (1880). 



Hob. North of North America. 



a-g. <$ 2 ■ St. Martin's Falls. Dr. Bamston. 



h. $ . Nova Scotia. Presented bv F. Walker. 



i. 6. 



7. Trichiosoma lanuginosum. 



Trichiosoma lanuginosa. Nort. Trans. Amer. Ent. Soc. i. p. 44 

 (1867). 



Hab. California. 



8. Trichiosoma crassum. 



(Plate I. fig. 5.) 



Exp. al. 1 poll. 7 lin., long. corp. 9 lin. 



Probably allied to T. lanuginosum ; body shorter and thicker 

 than in T. lucorum, &c. ; head broad ; club of the antennae abruptly 

 pear-shaped. Black ; prothorax, scutellum, and base of abdomen 

 densely clothed with yellowish-grey hairs, which are particularly 

 thick on the sides of the pectus. Head and thorax finely punctured; 

 cheeks hairy behind. Undersurface with scattered hairs. Abdo- 

 men nearly bare above, except at base ; extremity and edges of the 

 segments rufous beneath. Femora blue-black ; tibise and tarsi tes- 

 taceous. Wings rather long and narrow, yellowish hyaline, smoky 

 yellow along the costa ; hind margin scarcely more clouded than the 

 rest of the wing. 



Hab. Newfoundland. 

 a. 2 • (Type of species.) Newfoundland. W. C. St. John, Esq. 



9. Trichiosoma marginale. 



Trichiosoma marginale, Leach, Zool. Misc. iii. p. 109, n. 3 (1817). 

 Cimbex trichiosoma, St.-Farg. Mon. Tenthr. p. 34, n. 93 (1823). 



Hab. ?* 



* The type appears to be lost ; and the description does not agree exactly 

 with any specimen in the Museum collection. Zaddach treats this insect as a 

 variety of T. vitellina. 



