BRUESI PARASITIC HYMENOPTERA. 51 



Type.— No. 2135, M. C. Z., Florissant, Col. (No. 16,372, S. H. 

 Scudder Coll.). 



POLYSPHINCTA PETRORUM, Sp. IIOV. (Fig. 37.) 



Female. Length 8-9 mm. Entirely black, except the last abdominal seg- 

 ment and the apical part of the venter. Antennae nearly three-fourths as 

 long as the body, the basal joints of the flagellum very long, fully five or more 

 times as long as thick, apical joints suddenly becoming much shorter, sub- 

 quadrate. Thorax distinctly punctulate, the pleurae and metanotum in 

 great part finely rugose. Metathorax apparently completely areolated with 

 the exception of the apical pleu- 

 ral areas; the spiracle large, 

 oval. Abdomen nearly twice as 

 long as the head and thorax to- 

 gether, much enlarged apically. 

 First segment longitudinally 

 aciculate and rugulose, with Fig. 37.— Polysphincta petrorum, sp. nov. 

 lateral carinae. Following seg- Type, 



ments not coarsely sculptured. 



Ovipositor not entirely preserved, more than one-half the length of the 

 abdomen. Wings subhyaline, stigma and veins piceous. Marginal cell rather 

 broad and short; transverse cubitus long, separated by about its own length 

 from the recurrent nervure. Discocubital cell long; the discocubital vein 

 rather sharply but only slightly bent at its middle. Median and submedian 

 cells of equal length, the transverse median nervure scarcely oblique. 



Type.— No. 2136, M. C. Z., Florissant, Col. (No. 12,947, S. H. 

 Scudder Coll.). 



Polysphincta saxea Scudder. 



Rept. Geol. Surv. Canada, 1875-76, 1877, p. 268. 

 This is probably a Polysphincta. 



Pimpla Fabricius. 



Key to the Florissant species of Pimpla. 



1. Discocubital vein with a long stump of a vein, areolet with a 

 rather long petiole above; abdomen conspicuously banded. 



P. appendigera Brues. 



Discocubital vein without a stump, or at most with a slight trace 



of one 2. 



