BIU'ES: PARASITIC EYMENOPTERA. 49 



Five genera of Pimplini, Rhyssa, Glypta, Polysphineta, Pimpla, 

 and Xylonomus have been found in Tertiary deposits and all of these 

 occur at Florissant. Glypta has been found by Scudder also in the 

 Oligocene of Green River, Wyoming, Pimpla in a number of European 

 localities and also at Quesnel, British Columbia, Rhyssa at Radoboj 

 and at Green River. Of the entire number Pimpla is the most abun- 

 dant, being represented by many species. 



Glypta aurora, sp. nov. (Fig. 35.) 



Female. Length 9 mm. Black, sutures and tip of abdomen more or less 

 light colored. Antennae short, about half the length of the abdomen; basal 

 joints long; those at the middle and beyond nearly quadrate. Structure of 

 thorax not discernible. First abdominal segment with very strong deep 

 oblique grooves posterior- 

 ly, repeated less strongly 

 on the second and third 

 segments. Ovipositor pre- 

 served only at the ex- 

 treme base. Wings hya- 

 line, the stigma and veins 

 piceous. Stigma and mar- Fig. 35. — Glypta aurora, sp. nov. Type, 



ginal cell very elongate 



and narrow; areolet wanting, the recurrent nervure received nearly the 

 length of the transverse cubitus beyond the base of the latter. Discocubital 

 cell rather long, the discocubital vein rather sharply bent at its middle. 

 Median cell shorter than the submedian; transverse median vein oblique. 



Type.— No. 2133, M. C. Z., Florissant, Col. (No. 8153, S. H. 

 Scudder Coll. Not very well preserved, but the only species of Glypta 

 in the collection. 



Polysphincta Gravenhorst. 



Key to the Florissant species of Polysphincta. 



1. Small, slender species, 6 mm. in length, median cell distinctly 



shorter than the submedian .... P. mortuaria, sp. nov. 

 Larger species, median and submedian cells of equal length . 2. 



2. Length 12.5 mm.; transverse cubital nervure very short, not 



more than one-sixth as long as the greatest width of the marginal 



cell .P. inundata, sp. nov. 



Length about 8 or 9 mm.; transverse cubital nervure fully one- 

 third as long as the greatest width of the marginal cell. 



P. petrorum, sp. nov. 



