OF WASHINGTON, VOLUME XVIII, 1916 215 



Xylotrechus aceris n. sp. 



Male: Form and color like quadrimaculatus Hald., but differs from 

 that species in the markings of the thorax in which it resembles convergens 

 Lee. very closely. Head with the two frontal carinae distinct, united at 

 each end and rather widely separated in the middle, the sculpture is very 

 minute, dense and dull, except in an abruptly defined basal band ascend- 

 ing at the sides along the inner margin of the eyes, this band being shin- 

 ing and coarsely punctate. Antennae thick, compact and reaching just a 

 little past the humeri, joints of equal width throughout, the third just a 

 little longer than the first. Thorax as long as wide, coarsely granulate, 

 especially at the middle where the granules become confluent forming short 

 transverse rugae, sides feebly arcuate, slightly sinuate and narrowed near 

 base, a spot in each of the four angles above of sparse white pubescence. 

 Elytra a little more than twice as long as wide, at base a little wider than 

 thorax at middle, sides nearly straight, distinctly convergent from base 

 to apex, the latter obliquely truncate, outer angle acute but not spini- 

 form, color fuscous-black varying to sepia, a narroAv inconspicuous band 

 reaching from the scutellum to ne"ar the lateral margin at middle, then 

 bent forward along the margin for a short distance forming an acute angle, 

 and another oblique band reaching from the suture near middle to the 

 lateral margin at apical third of sparse white pubescence, surface between 

 these bands, also humeral and apical portions sprinkled with sparse semi- 

 erect white hairs. Body beneath black, shining, pro- and mesosternum 

 densely and roughly punctate, sparsely clothed with long white hairs, 

 a conspicuous spot on the posterior half of the metasternal episternum, 

 and similar ones upon the lateral posterior margins of the first, second, and 

 third segment of the abdomen, composed of dense short recumbent white 

 hairs; abdomen with punctures very fine and distant, surface clothed with 

 long erect inconspicuous hairs. Legs slender, the posterior femora rather 

 far from attaining the tips of the elytra, sparsely clothed with long erect 

 white hairs. Length 10 to 12 mm.; width 2.5 to 3 mm.' 



Female: Differs from the male only in the absence of the shining basal 

 band on the head, which is only traceable by the coarser punctures at the 

 base of the occiput in the female. Antennae not noticeably shorter than 

 in the male. The color is somewhat darker than in the male but this is 

 due to the type being a reared specimen and had not fully colored before 

 being killed. 



Type-locality: Washington, District of Columbia. 



Other localities: Newark, Delaware; Frankford, Kentucky: 

 Charter! )ak, Stoverdale, Linglestown, and Highspire, Pennsylvania. 



Type and allotype: Cat. No. 20626 U. S. N. M. All paia- 

 types ;ire in the U. S. Nat. Museum except three which are in 

 the author's collection. 



Described from five males and eight females; types MIH! two 

 females recorded under Bureau of Entomology Number Hopk. 



