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



The punctuation of the head and thorax is rather deep, 

 hut not coarse^ and is somewhat sparsely distributed, 

 becoming even more sparing on the scutellum and post- 

 scutellum. The metathorax is feebly rugose. The basal 

 segment of the hind body is strongly and moderately 

 closely punctate, while the punctures of the second seg- 

 ment are fine, becoming coarser towards the apex, and the 

 punctuation so continues on the other segments. The 

 tibiee and tarsi are much clothed with ashy pubescence, 

 and there is a good deal of whitish pubescence on the 

 body. 



The male has the following parts yellow, viz. : — The 

 clypeus (wholly or in part), the front of the scape and the 

 apical joint of the antennae, some spots on the prothorax, 

 on the tegulse, and on the tibiae, and the dorsal hind 

 margin of the basal two segments of the hind body. 

 Some or other of these markings are wanting in most 

 specimens, but I have seen none in which the clypeus is 

 not entirely (or very nearly so) of a bright yellow colour. 

 The female is quite devoid of colour, save that in some 

 specimens the apical dorsal margin of one or both of the 

 basal two segments of the hind body is obscurely tes- 

 taceous. 



This insect occurs on the sandy isthmus forming the 

 middle of the island Maui, and on the adjacent lower 

 slopes of Haleakala. 



N.B. I possess a single male specimen of an Odynerus 

 captured on Oahu, which is probably distinct from the 

 species last described, but is too closely allied to be treated 

 as new without the examination of a series of examples, 

 especially in consideration of my knowledge of the extent 

 to which the coloured markings of the Hawaiian Odyneri 

 vary. It has all the yellow markings of a male 0. insuli- 

 cola (except those on the flagellum), with the addition of 



