ON SOME TERTIARY SAWFLIES 
(HYMENOPTERA, SYMPHYTA) FROM COLORADO 
By A. N. Zhelochovtzev 1 and A. P. Rasnitsyn 2 
Through the kindness of Professor F. M. Carpenter (Harvard 
University, Cambridge, Massachusetts) we have managed to locate 
some Tertiary sawflies originally described by Professor C. T. 
Brues, Professor T. D. A. Cockerell, and Dr. S. A. Rohwer. Since 
the original descriptions and illustrations of the fossils are no longer 
adequate for present needs, we have revised the descriptions, pro- 
vided new illustrations, and revised the taxomic positions of the 
species. The drawings have been made by A. Rasnitsyn and most 
of the determinations by A. Zhelochovtzev. 
We are indebted to Professor Carpenter for his help in locating 
this material and for providing us with photographs of those speci- 
mens which could not be loaned. 
Family Xyelidae 
Megaxyela petrefacta Brues 
Figure i 
Megaxyela petrajacta Brues, 1908: 271. fig. 10 . 
The distal position of the fork of SC, the straight lower margin 
of imcu cell and the large size of the insect confirm the membership 
of this species in Megaxyela Ashmead. The species apparently differs 
from all Recent species of the genus by the narrower ovipositor, 
which is similar to that of Macroxyela Kirby. 
Material examined: Holotype No. 2049 (Musuem of Compara- 
tive Zoology, Harvard University), Oligocene of Florissant, Colo- 
rado. 
Family Blasticotomidae 
Runaria ostenta (Brues) comb. nov. 
Figure 2 
Paremphytus ostentus: Brues, 1908: 265, fig. 6; Benson, 1942: 47. 
The completely reduced 4th antennal segment, the distal position 
of 2m-cu crossvein, and the short ovipositor allow us to include this 
species in the genus Runaria Malaise. It differs from Recent 
species by the enlargement of the head behind the eyes. 
Zoological Museum, University, Moscow, U.S.S.R. 
’Palaeontological Institute, Academy of Sciences, Moscow, U.S.S.R* 
Manuscript received, by the editor June 16, 1972 
315 
