1947] 
Dilaridee and Berothidce 
147 
Berothidae. The only sizable collection of Nallachius 
adults yet reported is that of Steyskal (1944), who col- 
lected six females and 21 males of americanus flying 
around a single dead tree in Detroit, Mich., during the 
months of June and July. It is possible that larvae oc- 
Fig. 1. Nallachius americanus (McL.), female, dorsal view of right wings. 
Length of front wing, 7.5 mm. Brookline, Pittsburgh, Pa. 
Photograph by F. M. Carpenter. 
curred in this tree, and also that oviposition was in 
progress. 
Previously unreported adult material of N. americanus 
consists of four males and four females from the Pitts- 
burgh area of Pennsylvania, one male from Odenton, Md., 
and a male from Bainbridge, Ga. (Detailed data appear 
