1975] 
Lawrence & Stephan — Cerylonidae 
159 
Distribution. Northern and eastern North America, from south- 
eastern British Columbia and central Alberta to southern Quebec 
and Maine, and south to Texas and the Carolinas. More commonly 
collected in the northern part of the range. 
Biology. Collected under bark of Acer , Fagus, and Picea, and in 
the following fungi : Pleurotus sp., Fomes fomentarius, Phellinus 
igniarius , and Bjerkandera adusta. Larvae collected in July in New 
Hampshire, under bark of hardwoods. 
The name Cerylon castaneus has usually been associated with the 
species called C. unicolor in this paper, and in most collections these 
two names are confused, Casey’s clypeale and sticticum being ap- 
plied to specimens with expanded pronotum and notched clypeus. 
In Say’s description, the point is made that the thorax is widely and 
slightly indented at base, each side of middle. This could refer to 
the basal narrowing of the pronotum, but it may also refer to discal 
impressions. Specimens under the name castaneum in the LeConte 
collection are definitely of the type with apically expanded pronotum 
and notched clypeus in the male, and we are considering this as 
Say’s species. The first specimen in the series has an orange disc 
(referring to southern states) and it is a female. Two other speci- 
mens have faded discs, so that the locality is uncertain. A fourth 
specimen bears the label “Can.” and is a male. Since the species is 
much more common in the northern part of the continent, we have 
chosen this last specimen as Neotype. 
Cerylon conditum, New Species 
This species is in the size range of C. distans, but differs from 
that species by the more elongate pronotum, more approximate meso- 
coxae, and notched clypeus in the male. Cerylon unicolor is usually 
smaller, and less elongate, without the notched clypeus in the male, 
while C. castaneum differs in having the pronotum strongly expanded 
apically and the elytral intervals flat. 
Description. Length 2. 2-2. 7 mm. Color dark reddish-brown; 
vestiture of very short, erect hairs, barely visible under 50 X mag- 
nification. Antennae about 0.75 X as long as pronotal width; seg- 
ment 3 1.25 X as long as 4; club 1.3 X as long as wide. Clypeus 
slightly emarginate in 9 , deeply notched in cf. Pronotum (fig. 16) 
0.95 X as long as wide, sides subparallel or slightly diverging, for 
basal three-fourths, converging apically to rounded angles; disc very 
slightly convex at middle, slightly sloping anterolaterally, with 2 
