122 THE ENTOMOLOGIST. 



species, quite agreeing with the modern Pimplinae, and referable 

 to Pimpla in the old, broad sense : 



Pimpla eocenica, n. sp. 



Ferruginous, with black head and terebra, and mesothorax 

 and scutellum fuscous, perhaps black in life. Wings clear, the 

 venation rather dilute fuscous. Head rather small ; thorax convex 

 dorsally in profile ; abdomen broadly sessile, very obtuse apically. 

 Head and thorax, 3'5 mm.; anterior wing, 6*5 mm.; abdomen, 

 4"5 mm.; terebra projecting 1'95 mm. beyond abdomen. 

 Measurements of anterior wing in microns : basal nervure, 960 ; 

 depth of stigma, 400 ; depth of marginal cell above areolet, 655 ; 

 depth of areolet 208, its length 512. Green Kiver shales, spring 



at head of Little Duck Creek, Cathedral Bluffs, Colorada. (Dean 

 E. Winchester, U.S. Geological Survey.) Among the Florissant 

 species this is nearest to P. rediviva, Brues, differing in the 

 coloration and the long areolet. The coloration recalls that of 

 the living Mesostenus thoracicus, Cresson. The shape of the 

 areolet suggests Theronia and related genera, and it might be 

 permissible to refer the species to Theronia. In any event, we 

 have definite proof of the existence of typical Pimplines as far 

 back as the Eocene, and there is so far no proof that any of the 

 Eocene species should be separated from modern genera. 



Thus, although we dismiss Ephialtites as unsatisfactory 

 evidence, it cannot be doubted that the Ichneumonidae, so well 

 developed in the early Tertiary, originated at least as early as the 

 later Mesozoic. 



THE VAEIATION OF SARROTHRIPUS REVAYANA, 



SCOPOLI. 

 By W. G. Sheldon, F.Z.S., F.E.S. 



(Concluded from p. 106.) 



Afzeliana Group. 



The principal characteristic of this grouj) is the develop- 

 ment of the dark triangular central costal blotch, which in the 

 majority of the forms extends half-way across the superiors. 



