ON THE NORTH AMERICAN COSS{D 2. 55 
SrRUCTURE.—The female antennie are pectinate. The terminal seg- 
ment of the abdomen narrows and becomes elongated and cylindrical 
towards its extremity. The male secondaries are half the size of the 
female’s and obliquely and sqarely eut off along external margin, being 
also discolorous and of a bright yellow. The thorax is long and 
narrowed, elevated in front of the fore wings. The head is longer 
and more projected compared with Cossus, the prothorax narrowing 
anteriorly, neck-like. The labial palpi are longer and more distinct. 
The fore wing is more produced apically, longer and narrower ; the outer 
edge less full and more oblique. The vestiture is sparse, thin, flatly 
laid on in body and wings. The hard chitinous tegument is less 
hidden, and the whole insect has a certain coleopterous aspect, remind- 
ing us of the wood-boring Cerambycida, such as Prionus, quite strongly. 
The aspect is not moth-like, but hard and chitinous. Just as there isa 
certain resemblance between different species feeding on a particular 
plant, as the pine-feeders, so do all borers have some points in common. 
The generic characteristics all hold good with the second species of this 
genus. 
PRIONOXYSTUS QUERCIPERDA Fitch. 
(Plate II, Fig. 4.) 
This species is smaller than robinia, the 2? expanding 46 or 47™™, the ¢ 
about 10™™ less. The male hind wings seem translucent, but on hold- 
ing them obliquely in certain lights the yellow tint may be seen plainly. 
This smaller and rarer species occurs also in Texas. It is freer from 
reticulations and more transparent than amy other form. 
We have representatives of four genera of Cosside in the United 
States, viz., Hypopta, Cossus, Prionoxystus,and Cossula. As tothe species 
described under Cossus, several are incompletely described, and none 
are now so well known as C. centerensis, which has been studied by my 
son, Dr. Theodore P. Bailey, and myself. 
COSSULA MAGNIFICA Bailey. 
(Plate II, Figs. 1, 2, and 3.) 
[This species was described by Dr. Bailey in Papilio for July, 1882 
(Vol. II, No. 6, p. 94), with notes upon its habits. The larva bores into 
live-oak (Quercus virens) in Florida. No new matter was prepared on 
this species at the time of his death, and we do not consider it necessary 
to repeat the original description.—C. V. R.| 
