HYMENOPTERA OP THE HAWAIIAN ISLANDS. 203 



elongate^ but decidedly less so than in P. Blackburni, the 

 width from eye to eye in front of the base of the antennae 

 being about the same as the length from the base of the 

 antennae to the apex of the clypeus. The apex of the 

 clypeus is ronnded. There is a very distinct elongate 

 depression on either side of the head close to the eyes. 

 The clypeus and the plate between it and the antennae are 

 yellow in the male^ as also is a narrow space on either side 

 of the clypeus, but the yellow colouring extends laterally 

 to the eyes only in the extreme front, and does not extend 

 at all behind the antennae, so that the head even in front 

 of the antennae is only partially yellow. The antennae are 

 uniformly of a blackish colour, the basal joint being not 

 much dilated but very strongly arched in the male. The 

 punctuation does not differ much from that of P. Black- 

 burni, the upper surface of the hind body showing no 

 distinct punctures. The legs are of a blackish colour, 

 except the front tibiae and tarsi of the male, which are 

 more or less testaceous in front. The size of the male 

 varies from 6|-io millim. long, that of the female from 

 7-1 Oj millim, long. 



The original types of P. facilis, Sm., were from the 

 Pauoa Valley, Oahu (not from Maui as stated by Mr. 

 Smith). The insect, however, occurs on Maui and also 

 on Hawaii. 



The only colour vars. I possess of the male have the 

 plate between the clypeus and the antennae black. 



5. Prosopis flavifrons. 



Prosopis flavifrons, Kirby, Ent. Month. Mag. xyii. p. 85 (^ ). 

 Allied (but not very closely I think) to P. Blackburni, 

 Sm., and P. facilis, Sm. This insect may be readily iden- 

 tified by the following characters : — The yellow mark on 

 the face occupies the whole space in front of the antennae, 



