CERAMBYCKXE 347 



6 Prothorax very short, fully one-half wider than long. Body unusually 

 small in size and rather stout; head with the median stria strongly 

 marked; prothorax black, pale at base and apex, confusedly, 

 minutely and densely vermiculato-rugulose, without a polished 

 median spot, the tubercles large, rather prominent, with their 

 summits broadly smooth, the lateral prominences bearing a minute 

 spicule; elytra much wider than the prothorax, short, barely three- 

 fifths longer than wide, parallel, the apices rather deeply sinuate, 

 the outer angle posteriorly spiculiform; erect black hairs few in 

 number and very short; surface unusually finely, moderately closely 

 punctate, confusedly toward the suture, sublinearly toward the 

 sides between the feebly tumescent lines, coarsely on the flanks, the 

 fine and very dense cinereous-white vestiture forming a very large 

 even anterior chevron, attaining the middle of the length, where it 

 joins the confusedly maculate remainder of the surface, the spots 

 fulvous, cinereous and black; at the middle laterally there is a 

 large and unusually sharply defined black area. Length ( 9 ) 

 4.3 mm.; width 1.6 mm. Massachusetts (Framingham), C. A. 

 Frost. Bred from Salix salicola n. sp. 



Prothorax about as long as wide, or never more than slightly abbrevi- 

 ated 7 



7 Elytral apices narrowly and deeply sinuate, the sutural tooth larger 

 than the lateral, which is sharply marked but not prolonged. Body 

 elongate, more depressed than usual, deep black; antennae (cf) 

 evidently longer than the body; prothorax slightly wider than long, 

 a little narrower at base than at apex, deep and subopaque black, 

 paler only along the apical and basal beads, finely, densely sculptured, 

 without smooth median area, the tubercles large and strong, their 

 summits smooth and shining, the lateral prominences strong, acutely 

 spiniform at their summits; elytra only a little wider than the 

 prothorax across the spines, parallel, nearly twice as long as wide, 

 rather closely pubescent, the vestiture black on the dark areas, 

 yellowish-white on the paler areas, the punctures moderate in size, 

 well separated, closer suturally and especially dense in the uniform 

 black basal area, seriate externally between the feebly tumid lines, 

 the flanks with unusually few punctures and only near the lower part; 

 pale dense vestiture forming a very dense and unusually large, ex- 

 ceptionally well defined area, in the form of a wide entire chevron, 

 the two posterior subsutural lobes of which nearly attain the middle 

 of the length, the anterior concave part more broken; posterior 

 pale and black confused maculation confined to but little more than 

 apical fourth; femora unusually strongly clavate. Length (cf) 

 6.5 mm.; width 2.0 mm. Colorado emarginatus n. sp. 



Elytral apices truncate, with sharply marked or more or less posteriorly 

 prominent outer angle. Body smaller, piceous-black to black and 

 more convex; pale elytral maculation occupying most of the surface, 

 the vacant black latero-medial area somewhat variable in extent, the 

 erect black hairs numerous and well developed; prothorax slightly 

 shorter than wide, the base barely perceptibly narrower than the 

 apex in either sex, the lateral prominences very acute, sometimes with 



