April-June, 1920 Bulletin Brooklyn Entomological Society 41 



placed in Clytus where one might otherwise be inclined to put it. 

 The color pattern is also not that of the members of that genus. 



Xylotrechus cinereus n. sp. 



Black, clothed with a few long hairs scattered along sides of prothorax 

 and on ventral surface and with short, cinereous pubescence distributed 

 sparsely over the front of head, base of antennae and legs, more densely 

 over the sides of prothorax and entire under surface, especially marked 

 along the posterior margins of the sclerites, both thoracic and abdominal, 

 and formed into a well defined design on the elytra consisting of a short 

 transverse bar slightly posterior to the base, a line running along the su- 

 ture from the scutellum to the middle thence at right angles to the margin, 

 a third transverse bar midway between this last and apex, often broken 

 and with outer portion a bit more posteriorly, and with an additional gen- 

 eral suffusion of gray over the basal area of elytra and scutellum and also 

 over the apical half. Head granulate, moderately finely and evenly punc- 

 tulate, frontal carinae well defined; antennae barely reaching the middle of 

 body. Prothorax four fifths as long as broad, as broad as base of elytra, 

 sides broadly rounded at middle, gradually narrowed apically and slightly 

 constricted at base, disc granulate and punctate like head. Elytra over 

 twice as long as broad, sides fairly straight and convergent toward apex, 

 the apices obliquely truncate and pointed at tip, the disc rather finely 

 closely punctate and with many fine transverse rugae. Male, length 15 

 mm., breadth 5 mm. ; female, length 18 mm., breadth 6 mm. 



Type male and female in my collection, the male from near 

 Fallen Leaf Lake, Lake Tahoe, Cal., July 26, 191 5, taken on 

 Abies concolor Lindl. and Gord. by myself, the female from At- 

 woods Mill, Tulare Co., Cal., July 29, 1913. A paratype male 

 from Tallac, Eldorado Co., Cal., July 20, 1899, belongs to Dr. F. 

 E. Blaisdell and another paratype male, with vestiture yellowish, 

 but otherwise identical with the others, from Fallen Leaf Lake, 

 Lake Tahoe, Cal., July 9, 191 5, is in Mr. Ralph Hopping's collec- 

 tion. Numerous other specimens have also been seen. 



This species which has been previously considered to be but a 

 race of the widely distributed X'. undulatus Say not only differs 

 from that species by its color and distinctive color pattern but by 

 having a different food tree. It always breeds in the true firs, 

 Abies, as both Mr. Hopping and I have many times observed, 

 whereas undulatus lives in either the true spruces, Picea, or their 

 closer relative like Pseudofsuga. The pile of cinereus is usually 

 white, is always more or less diffusely scattered over the pro- 



