240 Descriptions and Records of Bees. 
hair (no black), the second with pale ochreous bands at sides, 
the third with similar bands less widely interrupted, the 
fourth with an entire pale band, the fifth covered with pale 
reddish hair, the sixth with creamy appressed hair; keel of 
sixth segment broadly rounded, the margin irregularly sub- 
crenate but not dentate, the central emargination moderate ; 
no ventral spines. 
Carcarana, Argentina (Z. Bruner, 44). U.S. National 
Museum. 
In the tables of Jérgensen and Schrottky it runs nearest to 
M. parsonsie, from which it differs by the small coxal spines, 
non-dentate end of abdomen, &c. It runs out at 13 in 
Vachal’s table, and in Friese’s Argentine table it goes to 
“M. simillima” =parsonsie. It is related to M. para- 
cxanthura, Ckll., but differs in the distribution of the hair on 
the abdomen and the dark spurs. Other species of Megachile 
taken by Bruner at Carcarana are JZ. infima, Vachal (69) ; 
M. ctenophora, Holmbg., apparently (70); JZ. gomphrene, 
Holmbg., apparently (45) ; JZ. vagata, Vachal (43) ; J. men- 
dozana, Ckll. (63). The Megachile fauna of Argentina is 
very large, and as many of the species have been briefly 
described and many are known only from one sex, the deter- 
mination of the species is more or less difficult and uncertain. 
The species must be quite local in many cases; thus, Vachal 
described nine species from the Province of Mendoza, and 
Jérgensen subsequently reported twenty species from that 
province, but did not meet with any of Vachal’s. 
Xylocopa frontalis nitens (Lepeletier). 
Apis morio, Fabr., 1793, is preoccupied by Apis morio, 
Swed., 1787 ; the insect consequently takes the name nitens 
(Xylocopa nitens, Lep., 1841). 
Agapostemon heterurus, sp. 0. 
? .—Length about 10 mm. ; anterior wing 7°8 mm. 
Head and thorax a rather bluish green, the strongly striate 
cheeks steel-blue ; face broad, eyes emarginate; mandibles 
pale yellow basally; clypeus black except basally, convex, 
punctured, with a deep median sulcus; supraclypeal area 
varying from brassy to bluish ; flagellum ferruginous 
beneath ; mesothorax and scutellum covered with short, felt- 
like, ferruginous hair; base of metathorax coarsely wrinkled, — 
the triangular area distinguishable ; posterior face coarsely 
transversely grooved ; tegule reddish brown. Wings dusky, 
especially at apex; first r.n. joining second s.m, about 
