94*7 

 ODYNERUS. 4 * ' 



Division ODYNERUS. 



Sauss., IIFdivis., Sect. IP (Et. Vesp. I, 177); Divis. Epsilon, 

 Sect. II" (ibid. Ill, 254). 



Forms as in Division Pachodynerus, but often more elongate; 

 the thorax more cubical, always in shape of an elongate- 

 square, often rather narrowed behind. Abdomen conical as 

 in Pachodynerus, or ovate-conical, but the first segment 



ALWAYS FULLY INCLUDING THE BASE OF THE 2d. {By excep- 

 tion, irregularly contracted at base of the 2d segment, the first 

 segment being smaller, ratter cup-shaped.— 0. Morelii.)— 

 Aniennse of the males terminated by a Jwok. 



The Odyneri of this Division have forms quite approximating to 

 those of Division Pachodynerus, forms which have been described 

 above, and they differ from these principally in the antennae of 

 the males which have the 13th joint recurved into a little hook. 

 • As these forms are not exactly alike in all, we arrange the spe- 

 cies in a series in which we can follow the thorax as it becomes 

 more elongate, and rather contracted behind, with the metathorax 

 becoming more and more rounded, losing its sharp edges, while 

 the abdomen is less conical and more and more ovate-conical. 



This Division includes quite varied types, principally charac- 

 terized by the modifications of the metathorax (which is sharp, 

 spined or rounded, and blunt), and by the form of the abdomen, 

 quite conical or elongate and more ovate. The more elongate 

 species pass into the forms of the Division Stenodynerus. As 

 these distinctions are difficult to establish, I have prepared a 

 tabular statement of them. 



Table to assist in distinguishing the Division Odynerus and Stenodynerus, 

 with regard to Pachodynerus. 



( Pachodynerus. 

 f Post-scutel truncate ; abdomen conical. j Odynerus. 



I Post-scutel truncate; abdomen spindle-shaped, the 

 "> first segment rather subpetiolate or funnel-shaped. Stenodynerus. 

 Post-scutel not truncate ; oblique, posteriorly angulate, 



. . Stenodi/nerus. 



punctate, 

 m, i -„oi Parhodi/nerus. 



Thorax cubical. ■' 



i Pachodynerus. 

 Odynerus. 

 Stenodynerus. 



