AMERICAN HYMENOPTERA. 127 



Megachile inf'ragilis. — %, — Form rather narrow, black; finely and 

 very densely punctured, face, cheeks and thorax densely clothed with a long 

 yellow or pale ochraceous pubescence, which on vertex and disk of meso- 

 thorax is fuscous; wings dusky at tips; legs slender, clothed with yellowish 

 pubescence, tarsi simple, slender and rufo-testaceous at tips; abdomen clothed 

 with long yellow or whitish pubescence on two basal segments, and fringed at 

 apex with short yellow or whitish hairs, interrupted on middle of segments 

 two and three; middle of segments 3 — 5 with short black hair; sixth segment 

 depressed on apical middle, the tip transversely compressed, broadly rounded, 

 sometimes subtruneate; sides of venter with long pale pubescence. Length 

 .35— .40 inch. 



Hab. — New York, (Comstock). This is narrower than hrevis, and 

 differs also by the apex of sixth abdominal sej^jment being entire. 

 The pubescence in fresh specimens is bright yellow. 



Jflegacliile petulans. — %. — Form short, broad, robust; black, rather 

 shining, closely and finely punctured, clothed with yellow pubescence, very 

 dense on face and clypeus and moderately so on thorax behind and laterally, 

 on cheeks and thorax beneath it is white, on vertex, mesothorax and scutellum 

 mixed with black; head broad; a line of dense appressed ochraceous pubes- 

 cence at base of scutellum; wings dusky at apex; legs slender, clothed with 

 long pale pubescence, anterior coxse each with a long black spine, their tarsi 

 simple: abdomen quadrate, finely punctured, base of second and third seg- 

 ments deeply transversely depressed, first segment with long yellow pubes- 

 cence, apical margin of segments 2 — 4 with a narrow fringe of same and base 

 of the segments more or less ochraceous, sixth segment covered entirely with 

 ochraceous, the apex broadly and deeply emarginate, the margin not serrate. 

 Length .40 inch. 



Hub. — North Carolina, Georgia, (Morrison). Eight specimens. 

 Closely resembles brevis Say, but easily separated by the apex of sixth 

 abdominal segment not having the edge serrate as in that species. 



Megacliile perbrevis. — %. — Small, short, robust, black, densely and 

 finely punctured, clothed with a yellow pubescence, long and dense on face, 

 clypeus, thorax except above, and on base of abdomen, on the cheeks and 

 thorax beneath it is white; head broad; disk of mesothorax almost entirely 

 nude; wings faintly dusky on apical margin; legs slender, clothed with long 

 pale pubescence, tips of tarsi testaceous, anterior coxae each with a, stout black 

 spine, their tarsi simple; abdomen very short, quadrate, clothed with yellow 

 pubescence, short and dense on apical margin of the segments; sixth segment 

 with dense appressed ochraceous pubescence, the apical margin transversely 

 compressed, notched medially and coarsely unevenly serrate on each side; 

 apical segment carinate and slightly toothed medially; sides of venter with 

 Jong white pubescence. Length .35 inch. 



Hab. — Texas, (Belfrage). Three specimens. 



Mogachile mexicana. — 9'— form broad, robust, black; face, cheeks 

 beneath, thorax behind, laterally and beneath with dense white pubescence, 

 that on vertex, mesothorax and scutellum black; mesothorax almost nude, 

 opaque, finely and sparsely punctured; a narrow line on anterior margin of 



