102 INSECUTOR INSCITI/E MENSTRUUS 



tance about equal to length of scape ; mandibles bidentate ; labrum with 

 a median tubercle ; clypeus roughened with irregular punctures, with a 

 shining vertical ridge on the median third or more, the lower margin in 

 middle broadly depressed, smooth and shining ; antennae wholly dark, 

 third joint nearly as long as following three together ; hair of head black, 

 mixed with fuscous on face, and with white on vertex ; thorax green, the 

 mesothorax (except the broadly blackened disk) yellowish green, the sides 

 wath various shades of blue-green and yellowish green ; mesothorax and 

 scutellum closely punctured ; hair of thorax short and quite dense, mainly 

 grayish-white, but fuscous on tubercles, behind wings, and on middle of 

 mesothorax ; tegulae dark green ; wings fuliginous, shining purple, the 

 apex slightly pallid ; femora submetallic, tibiae blue-green, tarsi piceous ; 

 hair of legs mainly black, but hind tibiae vsath much whitish hair on pos- 

 terior side ; hind tibiae with a small rounded black tubercle on outer side 

 before the middle, and the outwardly directed apical margin bilobed ; 

 abdomen shining bluish green, the color subglaucous, not very bright ; 

 punctures irregular but strong, closer on second and third segments than 

 on fourth ; first segment with much white hair, second with white hair at 

 extreme sides, fourth with a thin and narrow apical band of white haur ; 

 sixth segment and apex with dense black hair ; venter with white hair in 

 middle and much black laterally. 



Female: Length about 24 mm. ; similar to the male in most respects; 

 face broad ; vertex strongly green ; median line on clypeus very feeble ; 

 cheeks flattened or subconcave behind eyes, with large sparse punctures ; 

 black area on mesothorax very large ; hind tibiae with a large bidentate 

 process a little beyond the middle, and an oblique keel before that ; hair 

 of hind tibiae and tarsi black ; wings very dark ; no hair band on fourth 

 abdominal segment ; sides of venter with tufts or patches of white hair, 

 conspicuous from above toward apex. There is a small tubercle before 

 the anterior ocellus. 



Habitat : Yreka, California, bred from nests in Librocedrus decunens 

 by Mr. H. E. Burke, March 25, 1912. One male (type), two females. 

 This species is readily known from X. arizonensis by the abundant pale 

 hziir of the thorax, and in the male by the pale hair band on the abdo- 

 men. The wings are grayer in tint than those of arizonensis, which are 

 dark reddish fuliginous. Comparing individual specimens of librocedri 

 with arizonensis, differences of sculpture can be detected, but in view of 

 the variability of arizonensis these do not appear to be specific. The 



