1864.] 
409 
in the male. These parts in the female resemble those of the preced¬ 
ing species [O', rufipes']. Length 12 to 14 mill. 
“ Hah .—Island of St. Thomas.’’ 
Unknown to me. 
In addition to the above, the following European species is said to 
have occured in North America. I have not seen any specimens of it 
taken in this country. 
12. C. quadridentata, Linn., <fec. 
Ccdioxgs quadridentata, Smith, Bees of Great Britain, p. 146. 
“ Female. Length 5 lines.—Black; head and thorax roughly punc¬ 
tured, the face with a yellowish-white pubescence, the anterior margin 
of the clypeus having a dense pale fulvous fringe; the eyes pubescent. 
Thorax; the posterior margin of the scutellum obtusely angulate and 
armed on each side with a short tooth; the wings fusco-hyaline, their 
margins clouded. Abdomen shining, having scattered deep punctures; 
the apical segment very closely and finely punctured, subopaque, and 
having a slight longitudinal carina, the apex of the segment lanceolate; 
the ventral plate lanceolate, elongate, produced beyond the superior 
plate, and having a lanceolate appendage at the apex. 
Male. Length 4^ lines.—Black, punctured as in the other sex, 
the face having a dense silvery-white pubescence; the thorax as in the 
other sex; the apical segment of the abdomen produced into two stout 
bifurcate appendages, having on each side at their base a stout straight 
acute tooth. 
Hah. —(Europe;) United States; Trenton Falls,” (Smith). 
Gen. STELIS, Panz. 
Head transverse, the stemmata placed in a triangle on the vertex; antennae 
filiform in both sexes. The labial palpi four-jointed, the two basal joints elon¬ 
gate, the basal joint about two-thirds of the length of the second joint, the two 
apical joints minute. The maxillary palpi two-jointed, the joints minute. The 
superior wings with one marginal and two submarginal cells, the marginal cell 
as long as the two submarginals, its apex rounded ; the submarginal cells of 
about equal length, the second receiving the first recurrent nervure a little 
beyond the apex of the second submarginal cell, and unites with the abbreviated 
cubital nervure; the legs having the calcaria simple and the claws bifid.”— 
Smith, £ees of G-reat Britain, p. 151. 
1. S. obesa, Say. 
Stelis obesa. Say, Bost. Journ. ISTat. Hist, ii, p. 398. (1837.) 
“ Body robust, convex, punctured, black: nasus, mandibles at base, 
