1878.] ooo {Horn. 
short bristles, 1-3 gradually decreasing in length, fourth nearly as long as 
the preceding together, and with rather stout claws. 
I have already (Proc. Am. Ent. Soc. 1867, p. 293), called 
attention to a certain amount of confusion between Usechus 
and Rhagodera. The history of the two genera is in short as 
follows: Eschscholtz used the name Rhagodera tuberculata for 
an insect in the Dejean collection, and the name was pub- 
lished in the third edition of the Catalogue without descrip- 
tion. Mannerheim, in 1848, published in few words, a de- 
scription as that of Rhagodera tuberculata. This is the first 
publication, and has priority. In 1845, Motschulsky de- 
scribed and figured Usechus lacerta. This is also a correct de- 
scription and figure. While in London, in 1874, I saw 
that part of Dejean’s collection containing the original of the 
name Fhagodera, and found it to be the same as Usechus la- 
certa. Motschulsky probably saw this same specimen in Mr. 
EK. W. Janson’s possession, and was thereby induced to pro- 
nounce his insect synonymous. 
Rhagodera and Usechus must be allowed to stand in the 
sense in which they are at present used, and the name on 
the Dejean specimen go for naught. 
Two species are known to me. 
Thorax arcuate on the sides, hind angles rectangular........ tuberculata. 
Thorax strongly sinuate, hind angles acute, prominent........... costata. 
Rh. tuberculata Mann. Bu'l. Mosc. 1843, II, p. 300; Horn, Proc. 
Am. Ent. Soc. 1867, p. 293. 
Oblong depressed, brownish, sub-opaque. Head sparsely granulate. each 
granule with a small scale-like hair. Thorax broader than long, sides regu- 
larly arcuate, and gradually narrowed to base, margin serrate, and with 
short, scale-like hairs, hind angles rectangular, not prominent, base arcu- 
ate at middle, on each side serrate within the angles; dise strongly bicos- 
tate, costz arcuate, and convergent at apex and base, surface very sparsely 
granulate, and with scale-like hairs. Elytra oblong, humeri rectangular, 
suture, margin and the discal cost acutely elevated, intervals with two 
rows of large cribriform punctures. Body beneath sparsely granulate, and 
with few scales. Legs sparsely clothed with short, scale-like hairs. Length 
.22—.28 inch ; 5.5-7 mm. 
In well preserved clean specimens the summits of the 
elytral costee have erect scales ratlrer distantly placed, and 
between these are shorter capitate scales. 
