AMERICAN HYMENOPTERA. 347 



inserted on the side below the middle of preceding joint. Protborax 

 narrowed before, sloping down to neck, its margin slightly rimmed. 

 Color black ; a large spoton mandibles, palpi, hinder edge of protborax, 

 a stripe along the pleura, a spot on coxce and the trochanters, straw- 

 white ; the four basal segments of abdomen, coxge and legs below tro- 

 chanters, yellow red ; wings iridescent, perfectly clear, with a large 

 round black spot at the outer end of fourth submarginal cell and a 

 smaller round spot in middle of outer discoidal cell; first marginal cell 

 not wide at stigma. Lanceolate cell of under wing more than two 

 thirds the length of that above, the bounding nerve of brachial cell 

 above not coinciding with recurrent nervure above, but received iu 

 discoidal cell. 



% . — The male has the antennae ferruginous beneath. The four 

 basal segments of tergum are mostly black above. The inner nerve of 

 first marginal cell is broken near stigma. 



Farmington, Conn, June. 1 9 , 3 S . 



Sub-family 6. XYELIDES, Westw. 



Xydidcs, Westw. Mod. Class, ii. 1840, App. 55. 

 Xyelidcs, Halliday. 



Antennee about lo-jointed, the third joint very much elongated; 

 ovipositor exserted, nearly as long as the abdomen. 



63. XYELA, Dalm. 



Xyela, Dalmann, Ins. Nov. Gen. Stockholm, 1S19. 

 Analecta Ent. " 1823, p. 27. 



Pinicola, Latr. Diet. d'Hist. Nat. 2nd Edition. 



Mastigocerus, Klug. 



Wings with three marginal cells, the first smallest, and four sub- 

 marginals, the second and third each with a recurrent nervure ; three 

 discoidal cells ; the second brachial small, pentagonal ; the lanceolate 

 cell with oblique cross line, under wings with two middle cells. An- 

 tennse, nine to 12-jointed, the third very long. Clypeus whole, labrum 

 in form of a long crescent, entire; mandibles unequal, three and four 

 toothed; maxillary palpi, 7-joiuted (Hartig 6-jointed ! Westw.), elonga- 

 ted and elbowed, the fourth joint being terminated by three minute, 

 fleshy joints ; labium 3-lobed, labial palpi 3-jointed. Ovipositor ex- 

 serted, nearly as long as body, enclosed by two compressed pilose 

 sheaths. It is membranous; of two plates (Westwood, Mod, Class ii. 

 Ill, from which he argues its agreement with Tentlircdinidie) slightly 

 serrated. Anterior tihise with two apical spurs; hinder tibiae with two 

 side spurs (Westwood), three side spurs, Hartig. 



