2 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol.63. 



MEGACHILE ALOPECURA, new species. 



Male. — Length about 10.5 mm., with the general aspect of M. 

 poculifera; eyes blackish, green at lower end; face covered with 

 cream-colored hair, that on cheeks pure white ; mandibles broad, 

 black, with a red subapical spot, just before which is a broad tuft 

 of white hair; lower border of mandibles expanded into a keel, 

 above which is a shallow longitudinal depression or channel; ver- 

 tex closely but irregularly punctured; antennae black, slender and 

 simple; hair of thrbax white, a little brown on disk of mesothorax; 

 mesothorax and scutellum entirely dull, very densely rugosopunc- 

 tate: a line of white hair along posterior border of mesothorax; legs 

 black, with last joint of middle and hind tarsi clear red; anterior 

 tarsi light yellow, the basitarsus hollowed and boat-shaped, the edges 

 of the hollow fringed Avith reddish hair; posteriorly the anterior 

 tarsi have a long fringe, blackened apically, but there is no longi- 

 tudinal black stripe on the inner side, such as is seen in poculifera; 

 anterior coxae with stout diverging spines, and their trochanters 

 pointed or subcorneal below; middle femora stout but not toothed; 

 tegulae piceous with broadly reddened margins; wings smoky, 

 nervures dark, basal nervure falling short of nervulus, or meeting 

 it; abdomen with rather weak white hair bands on segments 2 and 

 3. that on 2 failing in middle; fourth segment with the band some- 

 what reddish; fifth and sixth segments covered with fox-red hair; 

 keel of sixth segment very broadly and quite deeph- emarginate 

 (general style of M. gemula Cresson), the margin somewhat irregu- 

 lar but not dentate ; no ventral spines. 



Two males: Victoria, Mexico, March 16. 



Easily known from M. gemula by the anterior tarsi, and from 

 M. poculifera by the characters of the anterior and middle legs. 



Typc.—Q2X. No. 25580, U.S.N.M. 



The above species of Megachile may be separated thus : 



Hair of pleura at least partly black 1. 



Hair of pleura all light 2. 



1. Larger; abdomen black, without light hair above totonaca Cresson. 



Smaller; abdomen with light hair bands laterally nigromixta Cockerell. 



2. Female: a broad pale ochreous band between mesothorax and scutellum. 



chrysophila Cockerell. 

 Male; a narrow white band between mesothorax and scutellum 3. 



3. Anterior tarsi with a short fringe of black hair along anterior edge. 



poculifera Cockerell. 

 Anterior tarsi with a longer fringe of red hair along anterior edge. 



alopecura Cockerell. 



COELIOXYS TOLTECA Cresson. 



One female. Differs from the next species by the form of the 

 scutellum. the black stigma, the first recurrent nervure entering sec- 

 ond submarginal cell far from base, and the basal nervure failing 

 to reach nervulus. Described from " Mexico." 



