1889.] Scientific News. 1 109 
tentional introductions ; e, Non-intentional introductions ; and /, 
Non-intentional importations. ... A number of interesting entomo- 
logical papers have lately been published in the Proceedings of the 
Iowa Academy of Sciences, by Professors Herbert Osborn and C. P. 
Gillette. . . . Professor A. J. Cook has published in a recent Bulletin 
of the Michigan Experiment Station an excellent discussion of insecti- 
cides. . . . Professor L. A. Forbes and his assistants have been engaged 
for some time in a study of the Aquatic life of Illinois ; and the first 
of a series of papers upon the subject has lately been distributed from 
the Illinois State Laboratory of Natural History. It is a descriptive 
catalogue of the animals of the Mississippi Bottoms near Quincy, Illi- 
nois, by Prof. H. Garman, formerly of the Laboratory force, but now 
entomologist of the Kentucky Experiment Station. 
Parasitic Castration of Typlocybae.' — M. A. Giard gives an 
accounliof his observations on the parasitic castration of Typlocybe 
by the hymenopterous larva Aphebpus melaleucus, and the dipterous 
larva Ateleneura spuria. Like their hosts these insects have two gen- 
erations in a year. The researches of Mr, James Edwards show that 
what, in a previous note, M. Giard called T. rosa L. should be dis- 
tinguished into T. Mppocastani J. Edw. and T. douglasi J. Edw. 
Aphelopus usually attacks the former and Atelenevra the latter. Para- 
sitism by Aphelopus generally causes the ovipositor to be much reduced, 
and incapable of penetration, but Ateleneura seems to have much less 
influence. The penis, on parasitic castration, undergoes considerable 
reductions, and the specific character is greatly modified.— -yi^wr^a/ 
Royal Microscopical Society. 
SCIENTIFIC NEWS. 
The Hayden gold medal for the advancement of geology, which is 
the gift of the widow of the late Prof. P. V. Hayden, has just been 
awarded by a committee of the Academy of Natural Sciences to Jas. 
Hall of Albany, N. Y. The Hayden medal fund amounts to $2,500, 
and from the interest a medal valued at $130 is to be presented an- 
nually to the person who has done the most during the year for the 
science which was Prof. Hayden's specialty. The award is in the 
hands of the Academy of Natural Sciences, and the committee con- 
sists of Profs. Frazer, Lesley, and Heilprin. 
» Comptes Rendus. c. IX. (1889), pp- 708-710. 
