OF WASHINGTON. 45 
of equal width throughout, though much narrower than the main 
gallery, and are presumably made by the larvae. 
Mr. Schwarz further spoke on a large colony of Xyleborus 
pubescens which he found in March near Washington in the 
solid wood of Pinus inops. The tree was dead, and of the hun- 
dreds of beetles contained therein not one was alive. The beetles 
had honey-combed the solid wood in all directions, thus obscur- 
ing and obliterating the work of the parent beetles and their larvae. 
That the beetles were all dead appears to be a significant fact as 
throwing some light upon one of the means employed by nature 
to prevent excessive multiplication of these Scolytids. It appears 
that, during the development of this large brood, the wood of the 
tree had become dry and shrunken, so as to prevent the perfect 
beetles from issuing from the entrance hole made by the parent 
beetle. Among the numerous specimens cut out from the wood 
there were a few specimens of the hitherto unknown male of the 
Xyleborus, which strikingly differs from the female.* 
Mr. Schwarz also called attention to the fact that the Tomicus 
xylographus Say of Fitch's Fourth Report cannot be Say's spe- 
cies, but must, in all probability, be referred to Xyleborus ccelatus ; 
and, finally, that Xyleborus obesus Lee. is, in all probability, the 
male of X. pyri. 
Mr. Smith called attention to some features in the structure of 
the Saturniidce. The family, as he proposes to limit it, has two 
branches to each antennal joint in the $ ; no tongue, retracted 
head, short palpi ; plump body, hind legs short and weak, tibiae 
without spurs, tarsi without spines, no frenulum, veins not more 
than n, usually 10, sometimes only 9. The Attacince have the 
antennae pectinated to the tip in both sexes. Except in Telea 
and Actias the discal cell of both wings is open. He considers 
that Samia, Platysamia, Philosamia, and Callosamia are all 
congeneric, and explained the differences and agreements between 
them. Telea seems congeneric with some of the European spe- 
cies referred to Saturnia. In Hyperchiria io the antennae are as 
in Attacus, but simple or only serrate in tfce ?. In the Cerato- 
campince the pectinations never extend to the tip ; the 9 has the 
antennae simple, except in Adelocephala bicolor, in which they 
*The male is described in Entomolog. Amertc., ii, p. 41. 
