144 WILLIAM J. FOX. 



sometimes, tips of fore and medial femora, tibi», except apex of hind pair and 

 an inconstant dark spot on other pairs, tai'si (apical joints darker) and a long, 

 narrow, somewhat sinuous spot on dorsal abdominal segments 2-5, yellow, the 

 spots on segment five usually united ; fii-st segment rarely spotted, tegulse entirely 

 testaceous. Length 8-9 mm. 



% . — First two joints of rtagellum strongly dentate beneath, the third and 

 fourth joints indistinctly so, the combined length of joints 1 and 2 as great as 

 that of the following four joints united ; head more strongly punctured than in 

 the female; dorsulum closely and rather strongly punctured, .somewhat granular 

 in a|>pearance ; middle segment .sculptured as in the 9, but more coarsely, in 

 some sijecimens the upper and posterior faces are coarsely rugose, central furrow 

 variable, in some specimens absent, or indistinct ; marked and colored about as 

 in the 9 - the pedicellum and mandibles black. Length 6-7 mm. 



Hudson Bay (Smith); Canada; New Hampshire; Connecticut 

 (Norton); New York; New Jersey; Pennsylvania; District of 

 Cohimbia ; Virginia ; Louisiana ; Illinois and Michigan ( Gillette). 

 Three females I refer here with some doubt ; they are smaller 6-7 

 mm., and the space between the hind ocelli distinctly greater than 

 that between them and nearest eye-margin. The C. obscurii^s de- 

 scribed by Provancher is evidently a % chrymrginus ; and the £ 

 described by the same authoi- under the name effosns I take to be % 

 of motddimx (:= cridata.'<). Packard's denticnlatu!< is evidently the 

 S of ohxcaru!^, and his effosns simply an abnormal form of the first 

 mentioned species. 



12. C'rabro ^raoiIi*i$!«iiniis Pack. 



Cnihro cuntujHiis Cresson (in part), I. c., p. 484, 9- 



Crnbro gracilissimus Packard, 1. «•., j). 78, % . 

 9 . — Differs from that of obsennis as follows : dorsulum and .scutellum a little 

 more strongly sculptured ; mesopleurfe less finely striated ; upper surface of mid- 

 dle segment with distinct, though not coarse, irregular striatious, not separated 

 from th(\ jiosterior face by foveie, lateral ridges of posterior face feebly ridged, 

 sides finely striated ; colored similarly to obscKrns, the metanotal spot usually 

 wanting, although sometimes present: abdominal spots variable, all united or 

 nearly so in some individuals and others with the finst segment maculated ; teguhe 

 with a yellow dot anteriorly ; pedicellum entirely black. Length -8 11 mm. 



% . — This sex is very close to that of ohsciirus : the sculpture of middle .segment 

 is not so coarse, the transverse series of fovese separating the upper surface from 

 the posterior face is narrower and not quite so strong, and the lateral ridges of 

 posterior face are scarcely developed : the abdominal markings vary as in the 9 , 

 and the spot on the tegulse is not always present. Length 6-8 mm. 



South Dakota (Aldrich); ('olorado; Nevada; California; Mt. 

 Hood, Oregon ; WashingtoiL The color of the markings varies 

 from pale to deep yellow. Cresson confused the female of this spe- 

 cies with C. conUijims ; this is shown by the types of that species. 



