HENRY L. VIERECK 
397 
first transverse cubitus as the first transverse cubitus is to the stigma on the 
radial vein, nervulus interstitial and forming an acute angle with the first 
abscissa of the discoidal vein, membrane with a uniform yellomsh tinge, legs 
browTiish to blackish brown and covered with brownish golden and ochreous 
hairs, scopa atypical, its hairs branched, pale ochreous and forming a dense 
brush, hind metatarsi at most apparently as wide as the middle metatarsi; pro- 
podeum with its enclosure poorly defined, dullish and finely reticulated, rest 
of upper face of propodeum sculptured somewhat like the mesopleura but with 
less distinct punctures, and covered with finer pale ochreous hair, propodeal 
pleura with a few shallow punctures, propodeal floccus pale golden; abdomen 
with its tergum shiny and sculptured much like the face, the punctures mostly 
from two to six puncture widths apart on the first tergite, the punctures hardly 
closer on the succeeding tergites, tergites with an apical, almost whitish stramin- 
eous margin, second, third and fourth tergites wdth an apical pale golden hair 
band, second tergite with its elevated portion dovm the middle : depressed por- 
tion :: 29: 12, fifth tergite shiny, reticulate, its punctures coarser and closer 
together than on the other tergites, pygidium nearly planate, without a shallow 
furrow on each side, nearly truncate at apex, tergum with inconspicuous, pale, 
nearly erect hairs in addition to the hair bands, fimbria bright golden. 
Andrena (Ptilandrena) yaqniorum new species 
Type. — No. 4053, The Academy of Natural Sciences of Phila- 
delphia. Type locality. — jMexico. (No further data.) 
Related to A. (P.) erigenoides Viereck. 
Male. — Length 7.5 mm.; body black, mostly covered with white hair; head 
with its facial line : transfacial line :: 49: 59, axial line : temporal line :: 24: 13, 
temples trapezoidal, almost rounded, malar space virtually crowded out be- 
tween the eye and the base of the mandibles, head covered with white hairs 
except along the inner eye margin, upper eye margin, and outer eye margin 
above the middle of temples and on front where the hairs are black, front 
striato-punctuate, shiny, ocellocular line : ocelloccipital line :: 11:4, face 
polished, distinctly punctured, its punctures from one to three puncture widths 
apart, clypeus nearly planate, clypeus apparently slightly convex near apex, 
polished, and more sparsely punctured than the face, not much elevated directly 
above the apical margin, clypearea virtually wanting, sculpture of the clypeus 
not hidden by the moustache, labrarea with a broad rounded emargination, 
polished, its width at base : greatest length :: 8: 4, width at apex : length down 
the middle :: 4: 3, labrarea at base nearly half as wide as the labrum, the latter 
with a fringe of brownish golden hairs, joint 3 of antennae : 4 :: 6: 4, joint 4 a 
little thicker than long, joint 5 as long as thick, joints 6 to 11 inclusive a little 
longer than thick, the end joint nearly twice as long as thick, antennae dulLsh, 
flagel almost straight in outline, antennae blackish brovTi throughout, mandi- 
bles atypical, rather robust, extending to the outer edge of the labrum and 
nearly to end of the basal third of its fellow, black except for the apical third 
which is reddish brovTi, palpi nearly typical; thorax covered with an abundance 
of white hairs, hairs of dorsulum mostly black and shorter than the hair of 
TRANS. AM. ENT. SOC., XLIII. 
