XV, 3 
Cockerell: The Black Halictine Bees 
277 
third submarginal cells about the same size, high and narrow, 
together smaller than first; first recurrent nervure meeting 
first transverse cubital; legs black, inner side of hind tarsi 
with bright ferruginous hair; hind spur pectinate; abdomen 
shining black, without evident punctures. The abdomen is like 
that of H. melanurops. 
Luzon, Mountain Province, Baguio {Baker). This species 
and the next two show a general relationship to some of the 
Australian forms. On the other hand, H. baguionis Crawf. is 
related to the Formosan H. perangulatus Ckll. ; so we have in 
the Philippines a meeting place of northern and southern groups 
of the genus. 
Halictus caroli sp. nov. 
Female. — Length, 6 millimeters; black, with broad abdomen; 
hair of head and thorax white, abundant at sides of thorax and 
long on clypeus; antenme black, with basal half of scape red 
in front; inner orbits rather strongly concave; face and front 
dullish; mesothorax and scutellum dull, without evident punc- 
tures; area of rnetathorax dull and granular, a little shining at 
apex, where there is a median sulcus; tegulae pale testaceous; 
wings faintly dusky, nervures and stigma piceous; second and 
third sumarginal cells high and narrow, about equal; first re- 
current nervure joining second submarginal cell near end; legs 
black, small joints of tarsi ferruginous ; abdomen black, shining, 
without bands or patches of tomentum; venter with a scopa of 
long curled hairs, tinged with ocherous at sides. 
Palawan, Puerto Princesa; sent by Prof. C. F. Baker, after 
whom it is named. 
Halictus mcgregori sp. nov. 
Female. — Length, 7 millimeters; black, with broad abdomen; 
hair of head and thorax scanty, but dense and dull white on 
tubercles, and sides of metathorax with a conspicuous white 
fringe; head broad, clypeus short; antenme black; supraclypeal 
area strongly convex; face and front moderately shining; me- 
sothorax and scutellum dull, without evident punctures; area 
of metathorax large, entirely opaque, faintly striate at sides 
toward base; posterior truncation hairy; tegulse ferruginous; 
wings dusky, nervures and stigma piceous; second and third 
submarginal cells high and narrow; first recurrent nervure 
meeting second transverse cubital; legs black, hind tibiae and 
tarsi with black hair on outer side and fulvous on inner; hind 
spur with a few large teeth; abdomen dullish, without band or 
