48 ENTOMOLOGICAL SOCIETY 
iting samples of the work of both species and prefacing his re- 
marks by a classification of the North American Scolytids from 
the biological standpoint. The oviposition of the first-named 
species was observed by Mr. Smith and himself on April 25 in 
a stump of a freshly-felled Pinus inops. The parent beetle bores 
through the bark and then straight downward between the outer- 
most two layers of wood. The egg-grooves are rather large, usu- 
ally only upon one side of the primary gallery, and contain each 
from three to five eggs. Modifications in the primary galleries 
were observed when the beetle had entered the wood from the 
cut edge of the stump, and especially when several beetles had 
entered through the same hole. The work of Monar thrum mali 
was illustrated by several pieces of Red Oak wood. The parent 
beetle bores through the bark straight into the wood to a distance 
of from five to seven mm. Then follows a transverse gallery, 
and, in most cases, a second transverse gallery immediately behind 
the first ; in several instances there is still a third gallery. The 
secondary burrows, in which the larvae undergo their transforma- 
tions, and which, in all probability, are made by the larvae, start 
rectangularly upward or downward from the transverse galleries, 
and are but little longer than the beetle. Oviposition in this 
species has not yet been observed, and it remains also uncertain 
whether only one or several beetles have been at work when 
there are two or three transverse galleries present. 
Mr. Smith exhibited colored drawings sent to him by Mr. 
Moschler from Germany, illustrating variations in color and 
markings of the wings of Deiopeia bella.* 
JUNE 3, 1886. 
Eleven persons present. President Howard in the chair. 
Mr. Smith read a paper on the scent organs found protruding 
from a narrow opening between the seventh and eighth ventral 
segments of two Bombycid moths, Leucarctia acrcca and Pyrrh- 
arctia Isabella .f 
* See " On the American species of the genus Utetheisa, Hubner." By 
H. B. Moschler (Entom. Amer., ii, pp. 73-75); see also letter from A. 
G. Butler, /. c., p. 212. 
fThis paper has been published by Mr. Smith in Entomol. Amer., ii, 
pp. 79, 80, under the title, " Scent-organs in some Bombycid Moths." 
