Insects Bred from American Larch 59 
Several bark beetles have already been mentioned as asso- 
ciated with C. pusillus in larch. In addition to these 
Asemum moestum and Serropalpus barbatus were bred from 
the same material, but these being wood-boring forms, their 
relations to the minute scolytid would not be at all close. 
Phyllobaenus dislocatus is the only predator associated and 
no parasites were bred from the same material. 
Drycoetes americanus Hopkins. 
Dryocoetes americanus, according to Hopkins (1915, 
p- 51) is the eastern North American species which has 
heretofore been confused with D. septentriones and D. auto- 
graphus. It has been recorded as the latter species, from 
Alaska, Hudson Bay Territory, Lake Superior, New Jersey, 
southwestern Pennsylvania, Virginia and West Virginia 
(Felt, 1906, pp. 672). It is probably found through the 
Rocky Mountain region also, for Fall and Cockerell (1907, 
pp. 217) lists it among the Coleoptera of New Mexico, and 
Hopkins (1915, pp. 51) states, ‘‘ Specimens from the Rocky 
Mountain region show minor differences that are hardly dis- 
tinctive enough to justify the designation of a different 
species.” Several species of coniferous woods have served 
as hosts for this scolytid. It was first recorded from red 
spruce (Picea rubens) in West Virginia in 1890 by Dr. 
Hopkins. In 1891 he reported a parasite — Spathius cana- 
densis Ashm.—from the bark of dead Piceae | Abies] excelsa 
in mines of D. autographus. Later it was taken from partly 
living and dead bark of black and Norway spruce and had 
also been found in pitch pine (Hopkins, 1899, pp. 445). 
It has also been taken from white pine and red spruce by 
the senior author at Cicero Swamp, N. Y., in September of 
1914; at Cranberry Lake, N. Y., in June, 1915 and 1916; 
and in Greene Co., N. Y., in 1914 and 1915. 
Very little in detail is recorded about the habits of this 
insect. It has generally been considered as preferring 
greatly weakened or dead bark in which to make its burrows. 
Another prominent characteristic is that the beetle almost 
