AMERICAN HYMENOPTERA. 129 



pair subdilated; wings tinged with yellow, dusky on apical margin; abdomen 

 short, broad at base, finely not closely punctured, shining, subiridescent, with 

 short black hair, basal segment with long thin yellowish pubescence, lateral 

 apical margin of segments 2 — 5 with a narrow pale fringe; apical segment 

 dense pale ochraceous; ventral scopa black, mixed with pale on middle. 

 Length .43 inch. 



Hah. — Mexico, (Sumichrast). Two specimens. 



Megachile montezuma.— 9 -—Form broad, robust, black ; head, thorax 

 and base of abdomen rather densely pubescent, pale on face, cheeks and thorax 

 beneath, and fulvous, more or less mixed with black, on vertex, thorax above 

 and behind and base of abdomen ; a small triangular smooth flat space above 

 clypeus; flagellum rufo- testaceous beneath ; mesothorax very finely and densely 

 punctured; tegulse fulvous; wings tinged with yellow, dusky on apical margin; 

 legs black or piceous, clothed with pale pubescence, yellow on tarsi: abdomen 

 clothed with short black pubescence, long on extreme sides, apical margin of 

 segments 2 — 5 with a fringe of short dense yellow pubescence; apical segment 

 densely ochraceous; ventral scopa fulvous, that on apical segments mixed with 

 black on the extreme sides. Length .43 inch. 



% . — Small, short, robust, head broad, the pubescence longer than in 9 , that 

 on face, clypeus and cheeks long, very dense and pale yellow; antennae reach- 

 ing to base of abdomen; wings strongly tinged with yellow; legs piceous, 

 clothed with long pale pubescence, anterior tibiae broadly dilated, their tarsi 

 slender, simple; abdomen short, quadrate, the apical fasciae paler than in 9 , 

 sixth segment sinuate at tip. Length .30 inch. 



Hah. — Mexico, (Sumichrast), Three specimens. The 9 resembles 

 that of azteca, and the S is remarkable for the dilated anterior tibiae, 



megachile tolnca.— % .—Form short, robust, black, opaque; head broader 

 than thorax, the pubescence on face and cheeks is long dense and yellow, that 

 on vertex fuscous, and that on cheeks white and very long beneath; antennse 

 long, flagellum dull testaceous beneath; thorax and base of abdomen with 

 dense fulvous pubescence, the former on sides and beneath pale, that on disk 

 of mesothorax short and thin, the surface very densely sculptured; tegulaj and 

 legs fulvous, coxae and trochanters black; anterior coxae each with an acute 

 black spine, their tarsi slender, simple, fringed beneath with long pale pubes- 

 cence; wings faintly dusky on apical margin; abdomen short, quadrate, seg- 

 ments 2 — 6 fringed at apex with dense yellow pubescence, base of fifth segment 

 and the sixth entirely densely ochraceous, the apex of the latter transversely 

 pinched, entire, immediately beneath the tips are two short acute distant teeth. 

 Length .35 inch. 



Hah. — Mexico, (Sumichrast). One specimen. 



Megachile Sumichrasti.— '^ ,— Robust, black, opaque; head with long 

 yellowish pubescence more or less mixed with black, that on base of clypeus 

 and a small tuft on each side of face entirely black ; thorax behind and laterally 

 clothed with long dense black pubescence, that on mesothorax short and ful- 

 vous, that on thorax beneath pale; tegulae pale fulvous; wings yellow, the 

 costal vein orange yellow, apical margin dusky; legs black or piceous, with 

 mixed black and pale pubescence, anterior coxae each with a stout black spine, 

 their femora fulvous within, their tarsi slender and simple; abdomen opaque, 



TBANS. AMER. ENT. SOC. VII. (17) MARCH, 1878. 



