COCKERELL— XORTH AMERICAS' HUES 
1906] 
33 
NORTH AMERICAN' BEES OE THE GENERA ANDRENA AND 
MELI TTA IN THE BREITSH MUSEUM. 
BV T. D. A. COCKERELL, BOULDER, COLORADO. 
Andrena aliena. Smith. 
St. John’s Bluff. Mr. Viereck sent .a species of the Trtichandreua group 
from Georgia, which was taken for alicna : but the true aliena is quite different 
and apparently should be referred to the /'Alandrcna group. Its distinctive 
characters, in comparison with the Georgia species, are as follows: 
Larger ; fimbria lighter and redder ; hair-bands very distinct on segments 2 
to 4, but broadly interrupted on 2 ; hind margins of abdominal segments strongly 
yellowish; punctures of abdomen much less strong and distinct, es])ecially on 
first segment ; area of metalhorax triangular, delii ately transversely striate, not 
at all longitudinally ridged, not bounded by an elevated rim ; wings practic- 
ally clear; tegulae small, dark reddish, conve.x, e.xtreniely shiny; mesothorax 
shining ; tibiae and tarsi tlark, nowhere strongly reddened: facial foveae prac- 
tically obsolete (a short area without ininctures or pubescence adjacent to 
upper part of eye); hair at sides of face very white; a strong raised line from 
middle ocellus to level of antennae antennal joint 3 about as long as 4^5; 
eyes converging below ; stigma narrow, dark reddish, the parts before and behind 
the marginal nervure about equal ; first recurrent nervure joining second sub- 
marginal cell at or almost at its middle; marginal cell narrow, its ti]i distinctly 
away from costa ; outer scopa of hind tibiae very long, somewhat dusky, espec- 
ially towards base, and very strongly plumose. .Altogether, this is a remark- 
able species. 
A/idrena friyida^ Smith 
Mr. Viereck sent for comparison a presumed friyida from Seattle, Wash- 
Comparison with the type showed that they had the same general appearance, 
pubescence, etc. but although very closely allied, they are not the same s])ecies. 
The tyne differed as follows: stigma lighter and yellower ; secoml sub- 
marginal cell larger, and basal nervure meeting transverse-medial ; abdomen 
broader ; ,.ind margins of abdominal segments dark reddish ; third antennal 
joint longer than 4^5; facial fovea broad, dark |nu]tle-brown (black in Seattle 
insect); lateral hairs of face, overlapping ftivea, black; process of labrum all 
shiny, narrowly subinarginately truncate, with sloping sides (in the Seattle insect 
with a dull apical protuberant area.) 
