HYMENOPTERA OF THE HAWAIIAN ISLANDS. 207 



rounded apex of the clypeus. In the male the face is en- 

 tirely (or almost entirely) yellow in front of the antennae, 

 but the yellow colouring does not pass the antennae back- 

 wai"ds. The flagellum is testaceous on the underside^ in 

 some specimens entirely ferruginous. The front tibiae of 

 the male are testaceous in front. In both sexes the hind 

 body is reddish (in some specimens quite red) . The basal 

 joint of the antennae in the male is strongly compressed, 

 its flat face being scarcely longer than broad. The hind 

 body beneath is almost impunctate and very shining in 

 the same sex, while across each segment runs a transverse, 

 rounded, and sinuated ridge, more strongly developed in 

 some specimens than in others. 



I possess two specimens of this insect from Maui and 

 five from Lanai. One of them (taken in company with 

 the males) is a female, and closely resembles the female of 

 P. Blackburni, Sm. 



9. Prosopis hilaris. 



Frosopis hilaris, Smith, Proc. Linn. Soc. xiv. p. 683 ; Kirby, Ent. Month. 

 Mag. xvii. p. 85. 



The male has been well described by Mr. Smith. The 

 female closely resembles it, being, however, somewhat 

 larger (9-9! millim. long). The colouring is precisely 

 similar, save that bright yellow is replaced by obscure 

 testaceous. The basal joint of the antennae is, of course, 

 not dilated, and the apical segments of the hind body 

 present the usual sexual differences. 



10. Prosopis volatilis. 



Prosopis volatilis, Smith, Proc. Linn. Soc. xiv. p. 683 ; Eirby, Ent. Month, 

 xyii. p. 85. 



This species (the male of which has been well described 

 by Mr. Smith) was taken on Oahu (not Kauai, as stated in 

 the original description). I have not seen the female. 



