224 IJULLKTIN 45, UNITED STATES NATIONAL MUSKUM. 



in^ the speck's coii^joiioiic. The typo of the gt'iius, r<»c»</< ticiiutlii J>ih'y, 

 has ^{ (lentjito niandiliU's. Those with L'deiitat*' inaiulil>h\s are IVom 

 ISouth Aiiu'rica and the West Indies, and are not inchule<l iiere. 



The only species wiiose parasitism is known was bred by Tiof. F. M. 

 Webster from the eg}^s of OvvunthnH niveun De (leer. 



Cacus cBcaiithi, k|). iiov., Riley. 

 (PI. XVI, Fig. 6, 9.) 



" (? 9 . Lc'»«;th, 2 to 2.20""". Black, snbopaque, closely pun<'tate, and 

 covered with a line, sericeous down. Head (juadrate, the cheeks 

 large, swollen, with striie converjfing' toward the mouth; nuindibles 

 and palpi, pale; anteiune with the base and apex of scape atul two 

 last funicular joints pale; pedicel rather long, thicker than the first 

 funicular joint; the latter h)nger and slenderer than the pedicel; 

 second funicular joint one-third shorter than the first; third and fourth 

 transverse. Thorax without mesouotal furrows; metatliorax with a 

 central carina and margined at apex; legs pale rufou.s, the coxaj 

 slightly dusky basally; wings hyaline, the marginal vein about half 

 the length of stigmal, the latter knobbed at tip, the i)Ostmarginal vein 

 long. Abdomen long, sublinear, narrowed at base, about one third 

 longer than the head and thorax together, and extending beyond the 

 tip of the wings when folded; first segment petioliform, striated, the 

 second and third longitudinally shagreened, nearly ecjual in length, the 

 following microscopically sculptured. 



''The $ agrees with the female very closely in shape, but the three 

 basal abdominal segments are striated and the antenna? are filiform, 

 brownish-yellow, the first and second funicle joints being abimt equal, 

 thrice as long as the pedicel, the third one-third shorter than the sec- 

 ond, the following to the last very slightly shorter and almost equal in 

 length, the last pointed, fusiform, and as long as the third flagellar 

 joint. 



"Habitat. — Lafayette, Ind. 



"Types in National 3Iuseum. 



"Bred by Prof. F. M. Webster, May 31, 1881, from the eggs of (Ecan- 

 thus niveus.^'' — [From Eiley^s MS.] -.^ - 



Auteris Forster. 



y . ' ' • Hym. Stud., ii, p. 101 (1856). 



(Type J. rM^<ar»i8 Fiirst.) 



Head transverse, the face convex or subconvex, not, or but slightly, 

 impressed above the antenuiv, the occiput and cheeks delicately mar- 

 gined; ocelli 3, triangularly arranged, the lateral about their width 

 from the border of the eye; eyes oval, usually pubescent. 



Antennae inserted at the clypeus, 12-jointed in both sexes, in $ cla- 



