﻿TWO NEW BARK=BEETLES FROM COLORADO* 



By M. W. Blackman, Professor of Forest Entomology, New York 

 State Colleo'e of Forestry, Syracuse, N. Y. 



Ips guild i n. sp. 



Description of the adult female: Keddisli brown to black 

 in color; 2.7 mm. to 3.5 mm. long (type 3.37 mm.), 2.88 times as 

 long as wide. 



Froni of the head (Plate X, fig. 2) is flattened below, granu- 

 late-punctate, with the epistoma widely and deeply emarginate, and 

 bordered with yellow hairs, which are more numerous near the 

 median line ; convex above, densely, coarsely, rugosely punctured, 

 with an impunctate elevated median carina, hairs rather short 

 and sparse; the eyes are coarsely granulate, with the inner line 

 broadly and shallowly emarginate ; the antennae are much lighter 

 in color, the club with the first suture straight at center, recurved, 

 at the sides, second suture bisinuate. 



The pronotitui (Plate X, fig. 1) is 1.17 times as long as wide, 

 with the posterior angles broadly rounded, the sides subparallel 

 to a point well in front of the summit, broadly rounded in front; 

 the anterior area densely and coarsely asperate, transversely de- 

 pressed and densely granulate just behind the summit except in 

 the median line, which is slightly elevated, smooth, shining and 

 impunctate ; the rest of the disc, shining, sparsely punctured, the 

 sides with coarser, more numerous punctures. Vestiture confined 

 to the asperate area, sides and depressions behind the summit ; 

 wanting on most of the disc. 



The elytra (Plate X, fig. 1) are slightly wider than the thorax, 

 1.75 times as long as wide, with the sides parallel as far as the 

 origin of the declivity, thence arcuately narrowed with the end 

 truncate ; striae impressed, strial punctures coarse, deep, closely 

 placed; interspaces rather narrow, with fewer, finer punctures 

 arranged uniserially and becoming larger near the declivity where 

 both strial and interstrial punctures become somewhat confused. 

 The declivity (Plate X, figs. 1, 3) is abrupt, nearly perpendicu- 

 lar, concave, with numerous coarse, deep punctures ; the sutural in- 

 terspace elevated ; lateral margins prominent, each armed with three 

 prominent, slender, conical, sharp, slightly incurved teeth; the 

 first arising from the second interspace and directed candad- 

 mesad; the second longer, curved, from opposite the third inter- 

 space and directed similarly; followed by a ridge which usually 

 bears two large tubercles (or blunt, low, rudimentarj' teeth), the 

 first in the fourth, the second in the fifth interspace ; the third 

 tooth is slightlv larger than the second, onlv slightly curved and 



* Contribution No. 32 from tlie Department of Forest Entomologj-, Xew 

 York State College of Forestry, Syracuse, N. Y. 



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