128 Mr. T. I). A. Cockerell — Descriptions and 



middle of thorax above. Smith does not mention this hair, 

 but I have examined his type. 



Melissodes nivea, Robertson. 

 Falls Church, Virginia, 4 S , Sept. 4 and 8 {N. Banks). 



Andrena nigroi, Robertson. 



Boulder, Colorado [Rohwer). 



New to Colorado, At Boulder, on May 22, 1907, 

 Mr. Rohwer took females of three species of Andrena^ all 

 liaving red abdomens, at the flowers of Salix luteosericea, 

 Rydberg. These, upon examination, prove to be A. nigrce, 

 Robertson, A. Marine, Robertson, and A. erythrogastra 

 (Ashmead). The known range of nigrce is extended about 

 800 miles Avestward. 



Andrena saccJiarina^ sp. n., Cockerell and Rohwer. 



^ . — Length about 8 mm. 



Black, with greyish-white hair, not nearly dense enough on 

 thorax above to hide the surface. Head rather large, quadrate, 

 facial quadrangle much broader than long ; front with coarse 

 vertical striae ; cheeks broad, with the rounded posterior angle 

 a little above level of middle of eye. Antennae long, third 

 joint longer than fourth, but a trifle shorter than 4 + 5 ; 

 "flagellum very obscurely brownish beneath, the middle joints 

 longer than broad. Mandibles strongly grooved, bidentate, 

 the apex reddish ; process of labrum broadly rounded, not at 

 all emarginate ; malar space large and shining ; clypeus much 

 jiroducedj mainly light yellow^ with strong but very sparse 

 punctures ; the yellow is invaded by black above and below, 

 so that its lower margin is convex (the apical margin of 

 clypeus being black) and its upper part is notched above and 

 deeply on each side ; mesothorax and scutellum dull, minutely 

 tessellate, with sparse feeble punctures ; area of metathorax 

 merely roughened, scarcely defined ; tegulie dark in front, 

 shining brown behind. Wings yellowish, iridescent, stigma 

 (of normal size) and nervures ferruginous ; second s.m. 

 narrow, receiving the r. n. near its middle. Legs black, with 

 light hair. Abdomen with a sericeous surface, not punctured, 

 the hind margins of the segments obscurely reddish, and with 

 very thin, not conspicuous, bands of wliite hair. 



On account of the produced clypeus and large malar space 

 this is related to A. Ie2)tantht, V. & C, but it is a very distinct 



