143 
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. 
Blackburni, Sm., is, I think, its nearest ally. The 
head is moderately elongate, but decidedly less so 
than in P. Blachhurni, 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 
rounded. 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 punctua- 
tion does not differ much from that of P. Blachhurni, 
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 J to 10 mm. long, that of the 
female from 7 to 10 J mm. long. 
The original types of P. facilis, Sm., were from the Pauoa 
Yalley, Oahu (not from Maui as stated by Mr. Smith). 
The insect, however, occurs on Maui and also on 
Hawaii. 
The only colour vars. I possesss of the $ have the plate 
between the clypeus and the antennae black. 
