HYMENOl'TEKA— ICHNEUMONIIKE. 60U 



LITHOl'ORUS gen. iiov. {\iOo<, Topoi). 



Tliis gemis of IchneumoniclcB is undoubtedly alli'ul to Exyston, but 

 differs from it, as it does from all members of the family known to me, by 

 the separation of the first from the second cubital cell In' a weak nervure, 

 not shown in the plate, which extends entirely across the space usualK' left 

 open in this family, though almost alwaj^s closed in the Braconidje. It is 

 also remarkable for the flaring of the apical culiital cell. The antennte are 

 shorter than the body and the abdomen has the basal joint comparatively 

 stout, considerably enlargin*^, and the subapical joints more than twice as 

 broad as long. 



LiTllOTORUS CRESSONI. 

 PI. 10, Fif;-. 21. 



The single specimen is pi-eserved on a side view in which all the parts 

 but the legs are preserved, but the wings are somewhat obscured by over- 

 lapping. Apparentl}^ the areola is not closed externally, and tlie outer 

 cubital cell is opened unusually wide, while tlie radial cell is exceptionally 

 deep for its length ; the parts below the areola are obscure. The antenna; 

 are moderately stout, reaching to the middle of the abdomen, the joints 

 scarcely moniliform, twice as long as broad. The thorax is compact oval. 

 The abdomen beyond the basal joint is as long as the head and thorax 

 together ; the basal joint is more than twice as broad apically as at the base 

 and less than twice its greatest breadth. The whole body, but especially 

 the thorax, is dark colored. 



Length of body, 4"'"' ; of antenna;, 3°"" ; of wing, 3™'". 



Green River, Wyoming. One specimen, No. 131 (Dr. A. S. Packard). 



KHYSSA Gravenhorst. 

 Rhyssa juvenis. 



PI. 10, Fig. 19. 



Although smaller than anv species I have noted, and nuich smaller 

 than most known to me, I can find no characters in this single specimen 

 which do not occur in Rhyssa, except in the relative ])roportions of the tho- 

 rax and abdomen. Tlie specimen is preserved on a side view and in a gcn- 



VOL XIII 3!t 



