COLEOPTERA. 
43 
men are more or less punctate, but I cannot use this character, as it is as 
variable as the sculpture of the elytra. The abdomen is very often denuded 
in the middle, and it offers at the base of the sides of the segments more 
or less apparent maculae, which are constant in very few species. The legs 
are rather short and not slender; the intermediate thighs do not extend 
beyond the base of the posterior, and the latter never extend beyond the 
apex of the third segment of the abdomen, only reaching in the majority 
to its middle. The tibiae are very slightly or but scarcely longer than the 
thighs, especially the posterior; they are a little dilated at the apex: the 
tarsi are nearly of the same length; their first joint is only one-third of the 
total length, and is never more than thrice, and very often not more than 
twice, as long as its apical breadth, especially in the anterior legs, which 
are densely clothed with the same pubescence as the body beneath, and 
annulated with black or fuscous. All these characters, independently of 
those given above, are sufficient to distinguish this genus from the allied 
elongated American forms. 
After much difficulty, I have adopted the following distribution of 
the species:— 
I. Antennae $ crassissimae, corpore multo longiores, articulis angula- 
tis, longitudinaliter canaliculatis, apice abrupte subglobosim 
clavatis. Elytra disco valde depressa, postice sat oblique deseen- 
dentia, callo ante-apicali brevi. Tibiae posticae intermediis evi- 
denter breviores. Articuli duo basales tarsorum supra lateribusque 
planati, subangulati, supra longitudinaliter canaliculati, primus 
latitudine apicali saltern triplo longior.— Ptych. depressus , Jekel. 
II. Antennae $ plus minusve crassae et longae, articulis cylindricis, 
apice sensim modiceque clavatis. Elytra disco sat deplanata, 
postice parum oblique declivia, callo ante-apicali subconico, basi 
lato. Tibiae postice intermediis baud breviores. Articuli duo 
basales tarsorum supra convexi, basi hand canaliculati, primus 
latitudine apicali solum duplo longior.— Pt. elongatus, Sch.; Pt. 
nebulosus , Oliv.; Pt. Columbianus, Jekel; Pt. tricostifrons , Sch. 
III. Antennae $ ut in Sectione II. Elytra convexa, ad suturam parum 
deplanata, postice oblique circulariter declivia, callo ante-apicali 
tuberculiformi, basi angusto. Tibiae ut in Sect. II. Articuli 
duo basales tarsorum supra convexi, basi haud canaliculati, pri¬ 
mus angustus, elongatus, latitudine apicali subtriplo longior.— 
Pt. callosus , Jekel; Pt. mixtus, Jekel. 
