HYMENOPTERA OF THE HAWAIIAN ISLANDS. 229 



lucide argenteo-pilosis, femoribus anticis antice tes- 

 taceis ; alis hyalinisj parum infuscatis ; abdomine sat 

 nitido^ subtiliter minus crebre punctato ; antennarum 

 articulo primo subfusiformi, quinto abrupte incras- 

 satOj sexto valde acute dentato^ dente quam articulus 

 vix breviori. 

 Long. II millim. 



The space between the eyes is much as in the preceding 

 species, the granulation of the eyes being a little coarser 

 than the male C mandibularis, Smith. The head is very 

 finely and closely punctured, and is clothed with longish 

 fuscous hairs. The prothorax and mesothorax are finely 

 and closely (but not very smoothly) punctured, and are 

 clothed with fuscous hairs. On the scutellum, postscu- 

 tellum, and metathorax the punctuation becomes shallow, 

 sparing, and decidedly coarse (while there is also a fine 

 and close punctuation), and the hairs are long and whitish. 

 The basal segment of the hind body is clothed with long 

 whitish hairs, the remaining segments and near the apex 

 are devoid of hairs (in my specimen possibly abraded), and 

 on the penultimate and apical segments there are traces 

 of golden pubescence. The punctuation of the hind body, 

 even to the apex, is almost obsolete. The apical third of 

 the second ventral segment is strongly flattened or even a 

 little concave in the middle, nearly the whole of the third 

 segment is distinctly concave, and the remaining segments 

 are all strongly flattened. 



A single specimen of this very distinct insect occurred 

 on Konahuanui, Oahu, at an elevation of about 2500 feet. 



My collection contains a specimen of a female Crabro 

 with yellow mandibles, taken at Oahu, that may possibly 

 prove to be a female C. abnormis, with the punctuation 

 not quite in its typical condition. It resembles the male 



