AMERICAN HYMENOPTERA. 131 



abdomen with parallel sides, base of segments three, four and five entirely 

 densely fulvo-ochraceous, lateral apical margin of segments 1 — 3 with a narrow 

 white fringe; venter whitish, the apical segment with short black hair. 

 Length .35 inch. 



%. — Very much like the 9> with the face and clypeus more densely pubes- 

 cent; the tarsi are all slender; the apex of abdomen incurved, the fourth and 

 fifth segments entirely ochraceous, the apex of sixth segment slightly emar- 

 ginate medially. Length .30 — .35 inch. 



Hab. — Mexico, (Sumichrast). Twelve specimens. 



Megachile iziicara.— 9 .— Form narrow, parallel, black, head and 

 thorax closely and strongly punctured; the face and cheeks with pale pubes- 

 cence, mixed with black on the clypeus, between the antennae and on vertex 

 it is long and black; clypeus short, broad, the apex broadly arcuate; the 

 pubescence on mesothorax and scutellum black, on lateral margin of meso- 

 thorax, on basal margin of scutellum, on metathorax, and on pleura it is 

 white; tegulce piceous ; wings faintly dusky at tips; legs slender, brown, tarsi 

 with yellowish pubescence; abdomen narrow, convex with parallel sides, basal 

 segment with long pale pubescence, short and dense on lateral apical maro-in; 

 base of second and third segments and the two apical segments entirely densely 

 fulvous; apical margin of segments 2 — 4 narrowly fringed with yellow; ventral 

 scopa yellow; fulvous at tip. Length .40 inch. 



^.— Face and clypeus with long dense black pubescence, that on middle of 

 face and tip of clypeus pale ; wings fuscous, pale at base; legs slender, simple, 

 the tarsi pale brown; abdomen densely golden-ochraceous on three apical seg- 

 ments, the sixth slightly notched on apical middle. Length .35 inch. 



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



Ceratina mexicana.— 9 •— Black, shining, slightly tinged with bronze; 

 head strongly punctured; an elongate mark on clypeus and a dot on each 

 extreme side, white or yellowish; labrum brownish, clothed with pale pubes- 

 cence; flagellum pale brown beneath; mesothorax sparsely and finely punc- 

 tured, smooth and polished on the disk, and with five finely impressed longi- 

 tudinal lines; pleura finely and densely punctured; tegulse fulvo- testaceous; 

 wings subhyaline, sometimes pale fuscous, darker at tips, nervures pale brown ; 

 legs brown or piceous, clothed with a whitish pubescence, most dense on pos- 

 terior pair, tarsi beneath with golden hair, anterior knees with two whitish 

 spots; abdomen dark olive-green, golden at tip, three basal segments shining, 

 finely punctured, apical segments densely and confluently sculptured, the 

 extreme apex produced into a short obtuse spine; venter with whitish pubes- 

 cence. Length .40 — .45 inch. 



'J,.— Spot on clypeus confluent with small lateral spots and also with short 

 line on lower anterior orbits, labrum and spot at base of mandibles white or 

 yellowish; face and scutellum more or less strongly tinged with green; pos- 

 terior legs much less pubescent than in 9; apical segment of abdomen with a 

 short subacute spine at tip. Length .35 — .40 inch. 



Hub. — Mexico, (Sumichrast). Eleven specimens. 



Ceratiua azteca.— 9.— Black, tinged with blue or green; head coarsely 

 punctured; clypeus with an obconic whitish spot; labrum with golden pubes- 

 cence; flagellum pale beneath; mesothorax sparsely and strongly punctured, 



