36 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



sharp and prominent keel: mandibles long and slender, dark red 

 apically and with a small inner tooth. Process of labrum broad and 

 rounded. Clypeus very wide, with a broad median smooth very 

 sparsely punctured microscopically tessellate area, sides with small 

 and rather numerous punctures. Front dull, coarsely vertically 

 striate; sides of vertex smooth and shiny. Flagellum obscurely 

 brownish beneath, first joint dull, contrasting with the remaining 

 joints, which are shining. Third antennal joint not twice as long as 

 fourth; fifth not much longer than fourth. Meso thorax dull in front, 

 but posteriorly shining, with scattered extremely minute punctures; 

 scutelium shining; area of metathorax rather shining, without ridges, 

 but with a median impressed line. Wings strongly brownish, stigma 

 and nervures dark red brown, stigma narrow. Basal nervure falling 

 just short of transverse median. Second submarginal cell large, re- 

 ceiving first recurrent nervure beyond the beginning on its last third. 

 Hind legs long and slender. Abdomen broad and convex, shiny, not 

 evidently punctured, hind margins of segments very obscurely brown- 

 ish. Pubescence scanty, but forming thin bands at sides of first three 

 segments and entire ones on fourth and fifth. 



Apical plate broadly truncate. " 



(This has the exact structure of occidentalis, but the type of that 

 species is smaller, with dull ferruginous hind tarsi, and clear ferrugin- 

 ous tegulae. However, an occidentalis from Beulah, Sapello Canyon, 

 New Mexico, no larger than the type, has dark reddish-brown tegulae 

 and hind tarsi dull brown.) 



c 44 . Cheeks in lateral outline obtusely angled, without a distinct convexity below the 

 angle; cheeks very broad. 



ANDRENA DURANGOENSIS, new species. 



Durango, Colorado. May 19, 1899. (Oslar.) 



Male. — Length, 10 J mm. Black, with long grayish white hair, a 

 little black at sides of front above, but this is very inconspicuous and 

 easily overlooked. Head extremely large and broad, facial quad- 

 rangle much longer than broad; process of labrum emarginate; 

 mandibles long and slender, curved downward; clypeus shining, 

 sparsely punctured, flattened in middle; sides of front dull, but 

 vertex shining; malar space rather large. Antennae slender, flagel- 

 lum obscure brown beneath. Third antennal joint not greatly longer 

 than fourth; fourth much longer than wide; fifth a little longer than 

 fourth. Cheeks extremely large, shining, convex, obtusely rectangu- 

 lar behind. Mesothorax small, dull and granular, as also scutelium, 

 postscutellum and metathorax, but sides of prothorax smooth and 

 brilliantly shining. Tegulae dark brown. Wings brownish hyaline, 

 apical margin darker. Stigma and nervures dark reddish. Basal 

 nervure falling short of transverse median, the large second sub- 



