252 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



similar, but the seventh is quite different. M. piliventris Morawitz 

 has the sixth abdominal segment serrate, but the anterior tarsi are 

 broadly dilated. 



Type.— Cat. No. 13536, U.S.N.M. 



MEGACHILE LADACENSIS, new species. 



Male. — Length, 11-114 mm.; black, the anterior femora in front, 

 their tibiae, extreme apex of middle and hind tibiae in front, and 

 middle and hind tarsi all ferruginous, the middle basitarsus suffused 

 with blackish basally; first three joints of anterior tarsi very pale 

 yellowish, last two ferruginous; head ordinary, rather broad; eyes 

 dull green; mandibles thick, with two apical teeth, which are more 

 or less reddish; beneath at base, the mandibles have a large process, 

 which fits into a little shelf on under side of head, the edge of which 

 is covered with ochreous tomentum; clypeus normal, shining and 

 minutely punctured; front minutely roughened; face covered with 

 long white hair; hair of vertex and thorax above thin, dull white; 

 meso thorax closely punctured, except in the middle of the disk, 

 where it is shining, with scattered punctures, but the posterior mid- 

 dle is dull; anterior edge of scutellum shining; tegulse ferruginous, 

 clouded with brownish toward base; wings hyaline, faintly dusky; 

 anterior coxae with stout dark spines, a little patch of orange pubes- 

 cence at the base of each; anterior tarsi little broadened, but with 

 a long white fringe behind, covering a yellowish one about half as 

 long; the light yellow basitarsus parallel-sided, more than twice as 

 long as broad, the inner apical corner produced, finger-like; hair on 

 inner side of hind tarsi very pale orange; hind spurs pale brownish; 

 abdomen shining, rather sparsely punctured, the hind margins of the 

 segments rather broadly testaceous or ferruginous; first two segments 

 with thin, long white hair; hind margins of second to fourth with thick 

 apical fringes of white hair, that on second developed only at sides, 

 that on third broadly interrupted, that on fourth entire; extreme 

 sides of third and fourth segments with some yellowish hair; no 

 black hair on abdomen anywhere ; fifth and sixth segments with long 

 ochreous or fulvous hair, the fifth with a white fringe under the 

 fulvous; projecting margin of sixth segment broadly shallowly 

 emarginate, and at sides variably inclined to be crenulate; seventh 

 segment with a strong median projection, and a little one on each 

 side; ventral segments broadly pale-margined, fourth emarginate. 



Habitat. — The type is labeled Rupshu, Ladak, 16,000 feet, July 

 21, 1897 (W.L.Abbott). 



Another male collected by Doctor Abbott is labeled Tsomorari 

 Lake, Rupshu, Ladak, 16,000 feet, July 31, 1897. Apparently close 

 to M. dentiventris Smith, but that has black tegulse, and the end of 

 the abdomen is different. 



Type.— Cat. No. 13537, U.S.N.M. 



