232 MESSRS. T. BLACKBURN AND P. CAMERON ON THE 



red pubescence^ which is still more conspicuous on the 

 whole of the penultimate segment in the female ; in this 

 sex the elongate apical segment also having a dense fringe 

 of long golden-red hairs. In both sexes the clypeus, front 

 of the headj and front tibiae are set with long golden-red 

 hairs. In the male the tooth on the sixth joint of the 

 antennae is only moderately developed^ and the ventral 

 segments resemble those of C, stygius, Kirby. 



This beautiful species is allied to C. stygius, Kirby, 

 which it resembles in having the eyes widely separated 

 and the space between them but little concave. The eyes 

 are excessively finely facetted, and the hind body is shaped 

 as in C. stygius &c. 



A single pair occurred on Haleakala, Maui, at an ele- 

 vation of about 5000 feet. 



45. Crabro rubro-caudatus. 



C. rubro-caudatus, sp. nov. ,^ . Vix nitidus, pubescens, 

 obscure punctatus, niger ; alis late cseruleis ; abdo- 

 mine in medio lato, segmentis sexto et septimo dense 

 aureo-pilosis. 



Long. 10 millim. 



The head and thorax are excessively finely punctured, 

 and are obscurely and confusedly sprinkled with a larger 

 system of punctures. The punctuation is rougher and 

 more obscure on the metathorax than on the anterior 

 parts, and there are some conspicuous oblique wrinkles 

 about its sides. The first five segments of the hind body 

 are brightly shining, and are distinctly finely and rather 

 closely punctured, without much pubescence ; the apical 

 two segments are very conspicuously and densely clothed 

 with long golden-red hair. The pubescence of the head 

 and thorax is rather dense, but not conspicuous, being of 

 a dark colour. The wings are of a beautiful clear blue 



