153 



9 , Color black ; head and thorax thinly pubescent ; legs sericeous ; 

 labrum black ; head and thorax densely punctured ; pleura coarsely 

 and mesothorax sparsely punctured ; abdomen rufous ; apical half of 

 seventh segment and the two apical segments black ; seventh segment 

 black beneath ; wings faintly clouded in middle ; legs black ; knees 

 of anterior pair, and, in some cases, part of tibiae ferruginous. 



$ . The male has more pubescence upon the face, and sometimes 

 more than three apical segments of abdomen black. Hab. Conn., Me. 



Fifty-three specimens examined. (9-25, (5-28.) Two received 

 from Mr. Packard. A large number were taken in April on the 

 Salix vitellina This can readily be distinguished from D. apricus by 

 its black legs ; and by the color, which in that inclines to honey- 

 yellow. 



5. D. siMiLis, (n. sp.) Black ; the prothorax, collar, and abdomen 

 rufous ; two apical segments of abdomen black. (Long. 0.33, Ex. 

 alar. 0.60 in.) 



? . Black ; liead and pleura coarsely punctured, sericeous ; clypeus 

 moderately emarginate ; palpi fiiscous ; prothorax, collar, and wing 

 scale rufous ; abdomen rufous ; two apical segments black ; legs black ; 

 anterior femora at tip, and tibiae at base rufous (tibiae indistinctly 

 rufous throughout) ; wings hyaline ; nervures black. Hab. Conn., 

 Maine, (H. Coll.) 



Three specimens examined. 

 - 6. D. MACULicoLLis, (n. sp.) Black; thorax ferruginous, before ; 

 abdomen dark ferruginous. (Long. 0.35, Ex. alar. 0.70 in.) 



9 . Black, antennse short ; head wide, vertex coarsely punctured ; 

 front of prothorax, collar, and anterior edge of pleura ferruginous ; 

 abdomen stout, dark, indistinctly ferruginous above and on sides, 

 black beneath ; legs black ; wings somewhat clouded. 



One specimen received from Mr. Akhurst, Brooklyn, L. I. It re- 

 sembles D. hicolor more nearly than any other, but is quite distinct. 



7. D. BicOLOR. (Tenth, bicolor. P. de Beauv. Ins. Af. and Am. 

 97.9.) "Yellow; antennae, head and spots on thorax, breast, scutel- 

 lum, feet, oviduct, and veins of the wings black." The head and 

 thorax are punctured, very coarsely on vertex ; head as wide as thorax ; 

 mandibles rufous at tip. In some cases the black spot on metathorax 

 is wanting ; both pairs of wings clouded at base. The abdomen is 

 short and stout. Hab. Mass. (H. Coll.), Conn., N. Y. (9 Long. 

 0.30, Ex. alar. 0.60 in.) 



Three specimens. 



8. D. ABDOMiNALis, (u. sp.) Black ; abdomen rufous. (Long. 

 0.33, Ex. alar. 0.68 in.) 



9 . Black ; clypeus angulate, deeply emarginate ; head and thorax 

 coarsely and rather sparsely punctured, sericeous, face with long. 



