se P. Cameron. 
apices of the joints and a line on the basal joint, pale 
yellow. Wings hyaline, highly iridescent, the nervures and 
stiema black. — Length 24 mm. 
Belize. 
Occiput, front and vertex thickly covered with long 
white hair, the pleurae with shorter white hair. Underside 
of scape yellow, the basal joints of flagellum brownish 
. below. Fore oceilus round, large, the posterior large, 
oblong. Basal half of clypeus keeled in the middie. Basal 
half of mesonotum depressed and keeled in the middle, 
the keel gradually narrowed towards the apex. Cheeks 
and clypeus with a silvery pubescence. 
The only species with which that here described can 
be coniounded is punctatfa F. They may be separated thus: 
1. Clypeus black, except at apex, mesonotum without 2 central lines, 
the line on scutellum interrupted, abdomen with 6 central spots, 
colour pale yellow. M. beligensis. 
— Clypeus yellow, with a befid black mark; mesonotum wita 2 yellow 
lines, the line on scutellum continuous, abdomen with 8 central spots, 
the yellow bright. M. punctata. 
Descriplion of a new species of Dielis 
from Ecuador. (Hym. 
By P. Cameron. 
Dielis ecuadorensis sp. nov. 9. 
Black ; the head and thorax densely covered with 
long white pubescence, the pubescence on the pro- and 
mesonotum tinged with fulvous, the abdominal segments 
iringed with white, sliehtly tinged with fulvous, hair; 
wings with the costa and nervures bricht ferruginous ; 
2nd cubital cellule not reaching to apex of the radial; its 
apex obliquely sloped, straight, not rounded, forming a 
sharp angle below ; calcaria black, the tibial spines black ; 
the tarsal spines black, slightly tinged with rufous. — 
Length 23 mm. 
Apex of clypeus stoutiy, irregularly, longitudinally 
striated, Front and vertex smooth, except for a band of 
large punctures across the ocelli, extending to the eyes. 
Pubescence on front, long, dense and pale. Mesonotum 
strongly punctured except for a large smooth square in 
the centre, commencing shortiy behind the middle, the 
