AMERICAN HYMENOPTERA. 121 



apical margin and yeHowish towards base; legs clothed with short yellowish 

 pubescence, which on tarsi is fulvous; abdomen with subparallel sides, closely 

 punctured, rather deeply transversely impressed at base; first segment clothed 

 with pale pubescence especially at sides, segments 2 — 5 with short black pubes- 

 cence and fringed at apex with a short dense yellow pubescence, longer at the 

 sides: apical segment covered with a dense yellow pile, the tip slightly com- 

 pressed; ventral scopa dense and pale yellowish. Length .45 — .60 inch. 



%. — Eesembles the 9 > but smaller, the face and clypeus clothed with a long 

 dense pale yellow or white pubescence; clypeus unarmed; cheeks beneath with 

 long wliite pubescence; wings paler; anterior coxae each with a long black 

 spine, their femora and tarsi fringed beneath with long white pubescence, that 

 on tarsi tipped within with fuscous, their tibise more or less fulvous within, the 

 tip acute beneath, their tarsi whitish, the three basal joints dilated, and at base 

 of the first a long pointed yellow lobe, hollow within, the second and third 

 joints also produced at tip above, each having a shining black spot on the 

 inside; four posterior tarsi rufo-testaceous, and clothed with yellow pubes- 

 cence; abdomen ornamented as in '9 > except that the extreme base of seg- 

 ments 3 — 5 have a yellowish band at base, and the fifth segment has long 

 fulvous hair; sixth segment deeply excavated, the apical margin transversely 

 compressed and deeply notched medially, with the sides more or less serrate. 

 Length .45 inch. 



Ilab. — Colorado, (Morrison) ; Califoruia, Oregon, (H. Edwards). 

 Fourteen specimen. The parallel form, bright yellow bands on 

 abdomen, and bidentate clypeus of 9 , will readily distinguish this 

 pretty species. 



Megachile mellitarsis.— 'J, .— Black, opaque, very densely and finely 

 punctured, clothed with a long white pubescence, very dense on face and 

 clypeus; a short, stout tooth on each side beneath base of mandibles; on 

 vertex and mesothorax the pubescence is very sparing; tegulae piceous; wings 

 tinged with yellow, the costal vein honey-yellow; legs black, the femora be- 

 neath clothed with a long white pubescence, all the tarsi bright saffron-yellow, 

 the two posterior pairs clothed with golden-yellow pubescence; anterior coxae 

 each with a long black spine, their tarsi dilated and fringed beneath with long 

 white pubescence and on upper margin within with short black hairs, at base 

 above a long process, hollow within, the tip sinuate and prolonged nearly to 

 base of the fourth joint, within the joints are striped or spotted with black; 

 abdomen subquadrate, shining, thickly clothed with a griseous pubescence, 

 long on basal segments, short and dense on apical margin of segments 2 — 4; 

 sixth segment excavated on disk, the apical margin slightly notched medially 

 and coarsely serrate; apical segment with a short subacute tooth on middle 

 and carinate on each side. Length .45 inch. 



Hah. — Colorado, (Morrison). One specimen. Easily distinguished 

 by the yellow tarsi ; the lobe at base of anterior pair is shaped exactly 

 as in Pahnei'i, the tip being prolonged and curved. 



Megachile Integra. — %. — -Black, closely and minutely punctured espe- 

 cially the thorax; head broader than thorax, the face and clypeus clothed 

 with long dense golden yellow pubescence, which on cheeks is white and on 

 vertex thin and ochraceous; base of mandibles with a patch of white pubes- 



TRANS. AMER. ENT. SOC. VII. (16) MARCH, 1878. 



