ON THE NORTH AMERICAN COS81IX£. 55 



Stbuci i ki:.— The female antennae are pectinate. The terminal 

 ment of the abdomen narrows and becomes elongated and cylind 

 towards its extremity. The male secondaries are half the size of the 

 female's and obliquely and sqarely cnt off along external margin, being 

 also discolorons 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 Cos8US : 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 Ceramby cuke, such as Prionus, quite strongly. 

 The aspect is not moth-like, but hard and chitinous. Just as there is a 

 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. 



Prioxoxystus querctperda Fitch. 



(Plate II, Fig. 4.) 



This species is smaller than robinkv. the $ expanding 46 or 47 mm , tie 

 about 10 mm 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 any other form. 



We have representatives of four genera of Cossidcv in the United 

 States, viz., Hypopta, Cossus, Prionoxystus, and Cossuhi. As to the sp< 

 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 MAGNJFICA Bailey. 

 (Plate II, Figs. 1, 2, and 3.) 



[This species was described by Dr. Bailey in Papilio for July. 1882 

 (Vol. II, Xo. 6, p. 94), with notes upon its habits. The larva bores into 

 live-oak (Querent virens) in Florida. Xo 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.] 



