AMERICAN ENTOMOLOGY. 67 



terior vitta and the scutel, it does not approach the suture at its 

 tip ; sutural edge black ; the series of punctures arc rather large 

 and profoundly impressed : beneath black, punctured : feet pale 

 testaceous. 



Obs. This is the C. birittatus of Melsheimer's Catalogue ; I 

 certainly would have adopted his name, had I not inadvertently 

 pre-occupied it with the description of the preceding species, 

 before I was acquainted with this insect. It can be readily per- 

 ceived to be specifically distinct from cither of those represented 

 with it on the accompanying plate, by the confluent density of 

 the thoracic punctures, as well as by its colors and their arrange- 

 ment. 



The lower left figure. 



[Belongs to Paclii/brcuJii/s. — Leg.] 



SCOLIA. Plate XXIX. 



Generic character. Thorax with the first segment very much 

 arcuated and contracted on the posterior middle ; antennae robust, 

 with short close set joints; the first joint long, cylindrical ; second 

 joint distinct ; superior wings not folded ; radial cellule detached 

 at tip from the anterior edge of the wing ; cubital cellules two 

 or three, the last one remote from the tip of the wing, the first 

 one placed on the same longitudinal line with the radial cellule ; 

 eyes emarginate ; stemmata three ) thighs thick, arcuated in the 

 females, compressed ; tail three spined in the males. 



Obx. A genus, in some respects, closely allied to Tijihia and 

 Plesia, but at once distinguishable by the emarginated eyes. 

 The thighs are remarkable for their thickness and curvature. 

 The form of the cubital cellules varies considerably, but to a 

 determinate and limited extent. In the distribution of the 

 nervures of the wings, Jurine remarks, they present more re- 

 markable anomalies, than are to be found in any other hymenop- 

 terous insects; "it would seem that nature, in circumscribing 

 the extent of the cubital cellules, has amused herself with vary- 

 ing them in several respects of manner and form, supplying to 

 one part what she retrenches from another." Latreille has 

 availed himself of these anomalies, to form divisions of the 

 numerous species of this genus. This author gives the following 

 account of the species : IMany of them are of a large size, and 



