HYMENOPTERA OF THE HAWAIIAN ISLANDS. 235 



the following : — a spot on the head behind the base of the 

 antennse, the scutellum and postscutellum, and a large 

 spot below the tegulse. The posterior margin of the basal 

 segments of the hind body is more broadly yellow, the 

 basal segment itself ap]3ears a little more strongly trans- 

 verse, and the punctuation of the whole insect a little 

 more sparing. 



CRABRONIDiE. 



Crabro. 



As it seems desirable to furnish some further remarks 

 on the species of this genus already described^ I think it 

 will be well for me to make a brief review of them, 

 interpolating descriptions of the new species in my col- 

 lection.— 2". B. 



36. Crabro affinis. 



Crabro affinis, Smith, Pi'oc. Linn. Soc. xit. p. 677. 



In this species the eyes are only moderately separated 

 in front, and the space between them is not (as compared 

 with same space in C. mandibularis) strongly concave near 

 the base of the antennse. The punctuation of the head is 

 quite evidently (though not at all strongly) rugose, espe- 

 cially in the male, and there are very distinct traces of 

 longitudinal strigosity. The eyes are facetted excessively 

 finely in both sexes. The hind body is rather wide in the 

 middle, thus being strongly rounded laterally. 



I possess a single male taken in company with the 

 female I sent to Mr. Smith, and clearly conspecific. The 

 sexual differences here are very similar to those in C. man- 

 dibularis, Smith. The mandibles of the male are pitchy 

 black, the face and clypeus silvery, the basal joint of the 

 antennse reddish pitchy (paler at the base), and a little 

 dilated in the middle. The sexual character in the sixth 



SER. III. VOL. x. Q 



