126 
Psyche 
[June 
siderably increased. Whenever a large number of caterpillars 
are supplied to one wasp, however, numerous moths appear so 
that many caterpillars escape being parasitized 
No data were collected on the duration of the different 
stages of development, but under variable conditions of room- 
temperature records were taken of times of setting parents and 
of collecting progeny. Maximum periods for a complete genera- 
tion thus ranged from 27 to 48 days inclusive with frequencies 
given in two-day intervals as follows: — 44, 59, 126, 151, 143, 100, 
88, 48, 20, 20, 15. These numbers show that the generation 
extends on the average slightly over a month, but may be some- 
what shorter, while laggards may extend the time considerably. 
THE JURASSIC INSECTS OF TURKESTAN 
By T. D. A. Cockerell, 
University of Colorado. 
In 1920 a very remarkable deposit of fossil insects of Jurassic 
age was discovered in the vicinity of Galkino, in Turkestan. 
The locality is within the territory of the so-called Cossack 
Republic, and is reached by the railway running east from Arys. 
Many of these insects have already been described by Martynov 
in Bull. Acad. Sci., Russia, (’25), but when I recently visited the 
Museum of the Academy at Leningrad, I was shown an amazing 
series of specimens, which when made known will profoundly 
influence many of our ideas concerning the age and evolution of 
various insect groups. The publications of Martynov on the 
Jurassic and Permian fossil insects will certainly be among the 
most important contributions to entomology in the next decade. 
My wife and I had meant to visit the Galkino locality, but 
when we tried to make the necessary arrangements at Tashkent, 
so many difficulties presented themselves that it was imprac- 
ticable to do anything. However, I was kindly permitted to 
study and describe some of the Galkino specimens in the Middle 
Asian Museum at Tashkent. Mr. Yankowsky, the director of 
