1947] 
Dilaridce and Berothidce 
151 
Bainbridge, Ga., April 6, 1943, at light, H. R. Dodge 
(!<?)• 
Larvae and pupae. — Jackson’s Isl., Md. (also known as 
Scott’s Isl. or Turkey Isl., located in Potomac River 11 
miles above Washington, D. C.), found May 19, 1913, near 
a larva of Micromalthus, while breaking up wood frag- 
ments taken from a decaying log, May 5; rearing unsuc- 
cessful; dead June 9; many other kinds of larvae in same 
log; E. A. Schwarz and H. S. Barber, 1 larva. 
Greenbelt, Md., April 13, 1938, beneath bark of moist 
rotten log, W. H. Anderson, 1 larva. 
College Park, Md., October 18, 1942, under bark of 
dead oak, W. H. Anderson, 1 larva. 
University Park, Md., January 28, 1945, in hard dead 
tulip-tree wood in galleries of living larvae of Pentar- 
thrinus and PMceophagus weevils, W. H. Anderson, 4 
larvae. Two pupae in cocoons recovered from same wood 
sample, but not in same gallery with the 4 larvae. 
Langley, Va., November 1, 1939, with bark from tree, 
W. H. Anderson, 1 larva. 
Biological notes: While the larvae of Nallachius have 
not been observed feeding, there is no doubt that they 
attack other insects, as indicated by the piercing-sucking 
jaws and their presence within the galleries of wood-in- 
habiting insects. They themselves are not equipped to 
bore in wood, though the rather heavy claws, particularly 
those of the front legs, are presumably well adapted to 
locomotion in galleries often somewhat choked with the 
frass of their would-be victims. The integument of most 
of the larval body is pale and weakly sclerotized, appar- 
ently an adaptation to a minimum exposure to light and 
the open air. Most adults evidently emerge during 
spring and early summer. Apparently there is a single 
generation per year and a 1-year life cycle. A large 
percentage of adults recorded were collected on or about 
tree trunks, and eggs are probably inserted into the 
cracks of dead wood or the crevices of or beneath dead 
bark. Judging from the long ovipositor, it is extremely 
unlikely that the eggs are stalked. 
