70 MAINE AGRICULTURAL LXPKRIMENT STATION. I912. 



of the first 4 segments narrowly brown and the whole of 5 and 

 6 (lark brown or black; hypopygium yellow (Figs. 39, 40) 

 Fore metatarsus about i.io longer than the tibia. Wings hya- 

 line, tinged with yellow (Fig. 167). 



Female. Hind margins of all abdominal segments widely 

 brown, produced forward on the median line. Ithaca, N. Y.. 

 July, reared from a shelving mushroom. 



10. E.rccliia ntigatoria n. sp. 

 Male. Length 4.5 mm. Pleura dusky yellow to light brown. 

 Abdomen dark brown, venter of first 3 segments yellow, ex- 

 tending up on the sides of the third segment; hypopygium yel- 

 low (Fig. 41). Fore metatarsus about 1.15 longer than the 

 tibia. Wings hyaline, tinged with yellow (Fig. 168). Kings- 

 ton, R. I. (J.B.). Nov., Price Co., Wis.' (W.M.W.) Aug., 

 Ithaca, N. Y. ! July, Aug. 



II. Excchia nativa n. sp. 



Male. Length 4.5 mm. Pleura brown, the abdomen as in B. 

 nugatoria, but the anterior margin of the 4 segments on each 

 side with oval yellow spot; hypopygium yellow (Fig. 42). Fore 

 metatarsvTs about 1.15 longer than the tibia. Wings hyaline, 

 tinged with yellow (Fig. 169). Orono, Me.! Oct.; Ithaca, N. 

 Y., Nov. Reared from CoIIybia sp.? 



Female. A specimen from Montpelier, Vt., (C.W.J.) June, 

 which I believe belongs here, is similar to the male but each 

 segment of the abdomen is widely margined with brown on 

 sides and dorsum, produced forward on the median line. 



12. Excchia interrupt a Zetterstedt. 

 Dept. Scand. XL 4240. 1852. 

 Male. Length 3.5-4 mm. Similar to E. nugatoria but the 

 fourth segment is also largely yellow on the venter and sides. 

 Hypopygium as figured (Fig. 43). 



Female. First and sixth abdominal segments dark brown, 

 the intermediate segments with dark triangles, smallest on the 

 fourth and fifth, caudal segments yellow. "Europe and Green- 

 land." 



