620 TERTlAllY INSECTS OF NORTH AMERICA. 



Family SPHEGID^E Westwood. 

 DIDINEIS Wesmael. 



DiDINEIS SOLIDESCENS. 

 PI. 10, I<^ig. 30. 



The body of the single specimen known is preserved on a side view 

 but partially dorsal, and though the antennpe, and legs are destroyed, the 

 wings are tolerably well preserved. Tliere is, however, no sign of any spine 

 on the sides of the metanotum, the thorax here appearing to be well rounded ; 

 nor would the abdomen appear to be so closely narrowed at the base as in 

 Didineis. The neuration of the wings agrees very closely with that of 

 Didineis lunicornis Fabr. sp., (except in the very nuich larger size and sub- 

 triangular shaj^e of the marginal cell, the width of which is nearly one-third 

 that of the wing. The middle discoidal cell also is remarkable for its ex- 

 treme length, being at least three times as long as its basal breadth. The 

 body is not very darkly colored on the stone, being of a rather pale testa- 

 ceous tint, but the apical half or less of the abdominal segments are paler 

 than the rest. 



Length of body, 7""" : (jf wing, 5:2i}""". 



Green River, Wyoming. One specimen, Nos. 132 and 263 (Dr. A. S. 

 Packard). 



