238 Mr. T. D. A. Cockerell—Deseriptions and 
oblique light. Abdomen shining, basal transverse depressions 
of second and third segments very deep; segments 1 to 5 
with narrow, entire, white hair-bands; fifth segment with 
short but coarse black hair before the band; sixth segment 
dorsally rugose, not tomentose, but with erect black hairs, the 
apical keel strongly bilobed, the large subtriangular lobes 
convex on outer margin and slightly concave within, the 
whole suggesting the opened mouth of some bird or fish; no 
subapical ventral armature. 
Trinidad, West Indies, June 6 (Aug. Busck). U.S. 
National Museum. 
A very distinct little species, superficially like M/. multidens, 
Fox, from. Jamaica, but structurally quite different. The 
obscure reddish stigma is quite well developed, whereas that 
of multidens is obsolete. The real affinity seems to be with 
such species as MM. disparipennis, Ckll., from Texas, and 
M. perpunctata, Ckll., from Mexico. These latter have the 
darkening of the marginal cell and adjacent parts much more 
intense, : 
Megachile holomelena, sp. n. 
@ —Length 12 mm. ; anterior wing 8 mm. 
Black, robust, the body and pubescence entirely black, the 
flagellum very fap sinh brownish beneath ; mandibles 
broad, obtusely quadridentate ; clypeus short and broad, 
densely punctured but clistening, the lower margin in middle 
smooth and polished, the edge straight and without any 
denticle ; supraclypeal area smooth and shining in middle; 
mesothorax very finely and closely punctured, not shining ; 
scutellum shining on dise, but well punctured ; tegule black. 
Wings brownish hyaline, a dark shade along costal side of 
marginal cell. Spurs of anterior tibize red. Abdomen. 
shining, last ventral segment truncate-subemarginate.. 
Chubut, Patagonia (from W. F. H. Rosenberg). U.S. 
National Museum. 
The hair on inner side of tarsi is black, not red as in 
M. chubutana, Schrottky. The insect is smaller than 
M. melancholica, Joerg., the wings are not yellowish, and 
the abdomen is much more hairy dorsally, especially toward 
the base. 
Megachile atramentata, sp. n. 
? —Length 12 mm. ; anterior wing 9 mm, 
Black, ree the body, antennze, and tegule wholly 
black ; the pubescence black, very obscurely reddish on innér 
