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



which the small plate between the clypeus and the antennae 

 is blacky and several specimens in which the lateral yellow 

 vittse are abbreviated, but none in which the yellow colour- 

 ing is confined to the space in front of the antennae. The 

 least brightly coloured specimens_, moreover, differ from 

 P. facilis, Sm., in having the entire space between the 

 eyes and the clypeus yellow. The scape of the antennae 

 is not much dilated in the male, being more than twice 

 as long as wide, and moderately arched ; it is generally 

 black, and rarely displays the yellow line mentioned in the 

 original description. In both sexes the flagellum is yellow 

 (or at least ferruginous) beneath j in some instances the 

 whole flagellum, and even the scape, is red, the underside 

 of the former being then of a vivid yellow. The colouring 

 of the legs varies, even in the male, from that described 

 by Mr. Smith, to an almost uniform pitchy colour, save 

 that the front of the front tibiae is always pale, and the 

 tarsi are seldom obscured. The wings have scarcely any 

 trace of fuscous colouring in the male and not much in 

 the female. The size of the male varies from 7-10 millim. 

 long, that of the female from 8-1 1 millim. long. I have 

 this species from Maui, Lanaii, and Hawaii. Specimens 

 from Hawaii seem to be, as a rule, more obscurely coloured 

 than those from other localities. The brightly coloured 

 type occurs on Maui, near the sea-coast. 



4. Prosopis facilis. 



Prosopis facilis, Smith, Proc. Linn. Soc. siv. p. 683 ; Kirby, Ent. Month, 

 xvii. p. 85. 



Of this insect I have examined about 50 examples. It 

 is not very close to any other of the genus, nor does it 

 vary much. The original description is a good one, but 

 may advantageously be amplified a little. P. Bluckburni, 

 Sm., is, I think, its nearest ally. The head is moderately 



