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triangular form between the base of the antennae, 
and also runs back as a gradually narrowing vitta 
adjacent to the eyes on either side of the head. The 
extent of this colouring is subject to occasional variety ; 
I have a specimen in which the small plate between 
the clypeus and the antennae is black, and several 
specimens in which the lateral yellow vittae are 
abbreviated, but none in which the yellow colouring 
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; in some instances the whole 
flagellum, and even the scape, is red, the underside of 
the former being then of a vivid yellow. The colour- 
ing 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 to 10 mm. long., that of the female 
from 8 to 11 mm. long. I have this species from 
Maui, Lanai, 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. — Pkosopis facilis. 
Prosopis facilis, Smith, Proc. Lin. vSoc., XIV., p. 683; 
Kirby, Ent. Mo. Mag., XVII., p. 85. 
