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other Hymenoptera in cockroach egg-cases, as well as the occurrences 
of both Chalcidids and Proctotrypids in the eggs of certain crickets, to 
say nothing of the fact that the large genus Scelio lives exclusively, so 
far as we know, in the egg-pods of AcridiidaB, should have been remem- 
bered. 
Mr. Townsend's misstatement has met the critical eye of M. A. Giard, 
of Paris, who has written us, giving a number of known instances of 
parasitism in Diptera and Neuroptera. He also remarks that Mr. 
Townseud has overlooked the recently discovered parasitism of Homop- 
tera by Elenchus. The subject of Parasitism in Insects was chosen for 
the annual address of the president of the Entomological Society of 
Washington for the year 1892, and was uppermost in our mind at the 
time, but we did not notice the above oversights, because they were in 
official minutes. 
COLORADO INSECTS. 
Under the title " Entomology of the Mid-Alpine Zone of Custer 
County, Colorado," Mr. T. D. A. Cockerell brings together the results 
of his somewhat extensive collecting during his residence in Colorado 
some years ago. He catalogues about a thousand species, which, 
although it may seem a small number to those who have collected only 
in regions of lower elevation, is probably fairly representative of at 
least the character of the insect fauna of the region described, which 
extends from 6,500 feet to 10,000 feet. It is essentially a zone of oak 
scrub and quaking aspen. The characteristic plants, birds, and mol- 
lusks of the region are mentioned briefly. The Coleopterous fauna is 
largely boreal, with a slight southern element and a fair number of 
species endemic in the Eocky Mountains. The butterflies are boreal, 
with a strong western element. The author discusses the question of 
zoological regions, particularly in reference to the system adopted by 
Dr. C. Hart Merriam, and briefly touches upon many interesting topics, 
such as the origin of the Eocky Mountain fauna, the fossil insects of 
Colorado, the glacial epoch, remnants of the ancient fauna, post-glacial 
development, and species-forming areas. The data are probably insuf- 
ficient for so comprehensive a summing up, but the paper is interesting 
and suggestive, and the list will form a basis upon which Colorado 
entomologists may work. 
LONDON -ENTOMOLOGICAL AND NATURAL HISTORY SOCIETY. 
The Transactions of the London Entomological and Natural History 
Society for 1893 has recently been issued in a pamphlet of some eighty 
pages of closely printed matter. It includes reports of the meetings of 
the Society from December 20, 1892, to December 5, 1893, together with 
abstracts of the papers read and an appendix consisting of papers pre- 
sented up to March 16, 1893. The following is a list of the more im- 
portant articles : Specific nomenclature, present, past, and future, by 
