382 
[February 
sublinear, slightly narrowed towards the base; furnished in the/ema?e with a 
dense scopa of pubescence. In the male, the abdomen is incurved and dentate 
at the apex.”—Smith, Bees of Great Britain, p. 187. 
Two North American species of this genus have been recorded, the 
descriptions of which follow. I have not been able to identify either 
of them. 
1. C. rugifrons, Smith. 
Chelostoma rugifrons. Smith, Brit. Mus. Cat. ii, p. 220, 9* (1864.) 
“ Female. Length 5 lines.—Black, the head strongly punctured; 
the face has some white pubescence on each side at the insertion of 
the antennae; the mandibles very stout, having a tooth near their base 
within, their apex tridentate, the middle tooth minute, longitudinally 
grooved above. Thorax strongly punctured; its pubescence, as well 
as that of the legs, white, the claw-joints rufo-testaceous, the tarsi be¬ 
neath fulvous, the wings subhyaline, the nervures black. Abdomen 
cylindric, shining and strongly punctured; the basal and apical mar¬ 
gins depressed; the first and three following segments have very nar- 
now fasciae of white pubescence, which is rather wider at the lateral 
margins; the fasciae cross the segments about one-third within, curving 
backwards to the lateral apical margins, the sixth segment covered 
with white pubescence at the base; beneath densely clothed with white 
pubescence. 
“ Hah. —Georgia.” 
2. C. albifrons, Kirby. 
Chelostoma alhifrons, Kirby, Faun. Bor.-Amer. iv, p. 270, %, (1837). 
“ Body black, thickly punctured. Mouth bearded with white; man¬ 
dibles carinated above, armed with two strong terminal teeth; nose 
square, fiat, clothed with decumbent silver pile; antennae filiform; 
scape black; the other joints are rufo-piceous underneath; trunk very 
hirsute with white or subcinereous hairs; wings a little embrowned, 
with black veins and base-covers; legs hairy; abdomen subcylindrical, 
hirsute with black hairs, incurved with the apex of the four interme¬ 
diate segments fringed with white hairs; anal joint with a concavity 
above, obtuse; last ventral segment forcipate, rufo-piceous. Length 
of the body lines.” 
Hah .—North America (“Lat. 65°.”). 
Monumetha ohwleta^ described below, agrees tolerably well with 
