406 
[February 
0. C. alternata, Say. 
Cadioxys alternata, Say, Bost. Journ. Nat. Hist. p. 401, % 9* (1837.) 
Female. —Head black, finely punctured, clothed with short appressed 
white pubescence, which is rather sparse on the clypeus and vertex ) 
anterior margin of the clypeus rounded and fringed with white pubes¬ 
cence; a slight longitudinal carina between the antennae; a well im¬ 
pressed puncture on each side of the upper margin of the clypeus; 
antennae black. Thorax black, somewhat shining, rather densely and 
deeply punctured, a transverse impression in front of the scutellum, 
which is rounded behind, with a stout blunt tooth on each side ; a line 
on the anterior margin of the thorax, curving around to the base of 
the wings, and a short line in front of the scutellum, white ; the pleura, 
posterior margin of the scutellum, and each side of the metathorax 
clothed with rather long whitish pubescence; tegulae piceous, smooth 
and shining. Wings hyaline, their apical margins slightly clouded; 
nervures fuscous. Legs black, sparsely clothed with cinereous pubes¬ 
cence ; tarsi beneath with dense yellowish pubescence. Abdomen 
elongate, black, shining, distinctly and rather sparsely punctured, espe¬ 
cially on the disk; on each side before the middle of the second and 
three following segments above, a transverse impressed line, slightly 
curved downwards and not reaching the disk of the segments, these 
impressed lines as well as the sides and anterior margin of the first seg¬ 
ment and the posterior margin of the first five segments clothed with 
short white pubescence; sides of the abdomen crenulated, which is 
caused by the contraction of the segments at their posterior lateral 
margins; apical segment with its superior plate elongate, lanceolate, 
sparsely punctured, with a slight longitudinal carina near the tip which 
is pointed and rather acute; inferior plate a little longer than the supe¬ 
rior, rather broad and rounded at the tip which is fringed with fuscous 
pubescence; beneath densely and deeply punctured, the segments hav¬ 
ing an obsolete whitish marginal fringe which is interrupted in the 
middle. Length 6 lines. 
Male. —“ Body black, punctured; the punctures not much crowded; 
head with short, white hair almost naked on the vertex : front with 
long, white, dense hair : antennae, tip of the basal joint obscurely pice¬ 
ous : thorax, an interrupted, arcuated, white line before, curving over 
the wings; a line before the scutel. and another at its tip, white : 
