HENRY L. VIERECK 
365 
NEW SPECIES OF NORTH AMERICAN BEES OF THE 
GENUS ANDRENA 
CONTAINED IN THE COLLECTIONS OF THE ACADEMY OF 
NATITLVL SCIENCES OF PHILADELPHIA 
BY HENRY L. VIERECK 
The following descriptions are contributions toward a mono- 
graph of the Pan-American species of Andrena. 
The proportions are in terms of divisions of a disc micrometer 
with 10 divisions to 1 mm., used in a Spencer Lens Company 
binocular with lOX Spencer ocular and 40 mm. Spencer objec- 
tive; each division appears to equal 42 /x. 
Andrena (Andrena) abacta' new species 
Type. — No. 4060, The Academ}’- of Natural Sciences of Phila- 
delphia. Type locality. — Texas. (No. 5, Belfrage?) 
Related to A. (A.) nigrae Robertson and A. (A.) snlictaria 
Robertson. It may prove to be a race of the latter species. 
Female. — Length 8 mm.; body greenish, mostly covered with whitish hairs; 
head with its facial line: transfacial line :: 43: 51, axial line : temporal line :: 
21 : 10, malar line : joint 3 of antennae : : 1 : 6, ocelloccipital line : greatest diameter 
of lateral ocellus :: 4:4, elevated portion of malar space virtually wanting, 
head covered with whitish hairs, front greenish and rather finely, longitudi- 
nally striate, not elevated into a welt along the fovea, fovea at most: ocellocular 
line :: 6:9, foveal band wanting at upper end of the inner eye margin, distance 
between fovea and ocelli : ocellocular line :: 2.5: 9, fovea attenuated below its 
middle where it is apparently only one-haK or a little more than half as wide 
as the greatest width of the fovea, the latter continued to a point apjmrently a 
little below the antennal line, fovea filled with pale golden hairs, fovarea 
represented by a beveled shiny space, face shiny, partly indistinctly reticulate, 
with indistinct punctures that are as many as four puncture widths apart, 
clyjieus brownish, slightly elevated above the apical margin, almost planate, 
sculptured like the face except that the punctures are larger and better defined, 
clypearea present but poorly defined, clypeus thinly hairy its sculpture not at 
all hidden by hairs, labrarea nearly semicircular in outline, its width at base : 
length down the middle :: 7: 2, labrarea at base apparently a little more than 
half as wide as the labrum, the latter with a fringe of pale golden hairs, labrum 
without a median longitudinal crista between the labrarea and apical edge of 
labrum, joint 3 of antennae : 4+5 :: 6:5, joint 4 and 5 thicker than long, the 
1 This specific name was proposed for this species by Prof. W. M. Davis. 
TRANS. AM. ENT. SOC., XLIII. 
