54 BULLETIN NO. 3, DIVISION OF ENTOMOLJGV. 



Cossus angbezi Bailey. 



(Plate II, Fig. 6.) 



"We repeat the original description of this species, given in Papiliofbr 

 June, 1882 (Yol. II, No. 6, p. 93) : 



Cossus angrkzi. li. s. 9 • Head somewhat narrow on tlie vertex. Collar ami bead 

 yellowish gray, thorax black; the edges of the tegulae sbaded with yellowish gray. 

 Fore wings with a nearly white ground, shaded with black, and with black reticula- 

 tions. Hind wings yellowish gray, mottled with blackish outwardly. The fore wings 

 have the costal edge pale, marked with black; the black shading obtains on costa at 

 apical third, and over the whole wing at terminal third, extending obliquely down- 

 wards and inwards; there are a series of interspacial longitudinal black streaks be- 

 fore the margin, more or less defined. Fringes whitish, dotted with black opposite 

 the ends of the veins, which latter conversely are whitish. Thorax shaded with yel- 

 lowish gray behind. Abdomen dark gray. Beneath the wings repeat the markings 

 very distinctly, owing to the strong contrast of the pale ground color with the black 

 markings. Expanse, 82 mi ". 1 9- Wells, Elko Co. , Nevada. From the late Mrs. 

 Caroline Chase. Type, coll. James S. Bailey. 



This I believe is a true Cossus, although the $ is uot known to me. 

 The shape of the wing is as in centeremis. The structure is that of 

 Cospus, and uot of Prionoxystus. The thorax is subquadrate, the vest- 

 iture short and thick. The interspacial black dashes along the prima- 

 ries subterminally distinguish it specifically. The pre-apical transverse 

 black streak or line resembles that of C. center ensis. The hind wings 

 are faintly reticulated. The ground color is a yellowish white. The 

 biack blotches on fore wings of robinicv are here wanting, while there is 

 n diffuse discal shade blotch, another above and beyond it on costa, and 

 the wing shows a wide, soft, blackish shading, obliquely edged inwardly 

 and covering the outer portions of the wing. Except the antennas my 

 type is perfect. Beneath it is strongly marked, and reminds one of 

 C. robinice Peck, but the shape of the wiug is not like that species. 

 The thorax is black above, not gray with black stripe on tegulse, and 

 the collar is discolorous, pale yellowish gray. This species ought to be 

 recognizable. The shape of the thorax is like Cossus, as is the vestiture, 

 so that I am not prepared to find that the male has the peculiarities of 

 C. robinice and querciperda Fitch. I hope Western collectors will solve 

 the question. But I cannot regard angrezi as having anything to do 

 with the question of a Western representative of robinue. From Her- 

 rich Schaefer's figure, and what has been published, I believe that robi- 

 nice is found across the continent. 



Prionoxystus robini^ Peck. 



1 have a female with extended ovipositor. We have probably only 

 one species, reaching from California to the East, and this is phy tophagic, 

 feeding on the oak, willow, as well as the locust and other trees. No 

 difference by which these forms can be separated is appreciable. The 

 female is redescribed as crepara by Dr. Harris. The insect was common 

 in 1882 in different localities in New York State. 



