1916.] NATURAL SCIKNCKS Oh PHILADELPHIA. 563 



propodeum with its enclosure poorly defined, irregularly coarsely 

 rugose, rounded at apex, rest of upper lace indefinitely punctured 

 and coarsely irregularly sculptured between the punctures, covered 

 with pale ochreous hair, propodeal pleurae shining, finely reticulated 

 along the lower and anterior margin, elsewhere with a loose network 

 of fine rugae in the interstices of which the integument is indistinctly 

 reticulate and punctured, partly nearly hidden by pale ochreous 

 hairs; abdomen wit h its tergum nearly polished and finely punctured, 

 the punctures sparsest on the depressed portion of the first tergite, 

 second, third and fourth tergites uniformly sculptured, partly finely, 

 indistinctly reticulate, with their punctures two to six or seven punc- 

 ture widths apart, second'tergite with its elevated portion down the 

 middle : depressed portion :: 16 : 7, fifth tergite with its basal 

 blackish portion covered with poorly defined punctures that are as 

 many as six puncture widths apart, depressed portion of tergites 

 brownish with an apical whitish edge, anal process entire, truncate, 

 dark brownish at apex, tergum with rather conspicuous pale ochreous 

 hairs that are supplemented on the sides of the second, third and 

 fourth tergites by thin pale ochreous apical hair bands, hair at apex 

 of abdomen pale ochreous. In manipulating the head with a pair 

 of forceps in order to get a better view of the labrarea the clypeus 

 was almost symmetrically impressed. 

 Andrena (Andrena) littlefieldi new species. 



Type. — No. 4,014. The Academy of Natural Sciences of Phila- 

 delphia. 



Type Locality. — Colorado Springs, Colorado, April 22, Worthington 

 Littlefield collector (T. D. A. Cockerell). 



Related to A. (A.) polygoni Viereck and Cockerell and closely 

 resembles A. (A.) placida Smith. 



Male. — Length, 6.5 mm.; body black, covered with whitish hairs; 

 head with its facial line : transfacial line :: 40 : 52, axial line : tem- 

 poral line at most :: 13 : 14, black, its pubescence whitish throughout 

 except along the lower edge of the labrum where it is golden, clypeal 

 punctures shallow, not sharply defined, at most two puncture widths 

 apart, mostly adjoining or nearly so, the interstices polished, clypearea 

 wanting clypeus convex, mandibles black with reddish castaneou- 

 tips, palpi typical, joint 3 of antennae : 4 and 5 :: 6 : 9, 3 : 4 :: 3 : 2 

 and 3 : 5 :: 6 : 5, antennae blackish brown, labrarea widely, arcuately 

 emarginate, greatest length of labrarea nearly twice the shortesl 

 length and apparently a little more than one-fourth the width of the 

 labrarea at its base, cheeks rounded or subtrapezoidal, widest a 



