478 INSECTA. 



inner extremity of their tibiae. The head is not prolonged ante- 

 riorly^). 



In a natural order this would perhaps be the place for the Bhxbus 

 of M. Fischer(2). 



In the others, where the antennae are always longer than the head 

 and thorax, and where the legs are most commonly of the same 

 thickness, the thorax is narrower than the base of the abdomen and 

 somewhat narrowed behind, and the hooks of the tarsi are entire. 



Calopus, Fab. Cerambyx, De Geer. 



Where the posterior legs, in both sexes, are the size of the others, 

 or nearly so, and where the serrated antennae are inserted into an 

 emargination of the eyes, with the second joint much shorter than 

 the third, in the form of a knot and transversal(S). 



Sparedrus, Meg. Dej. Pedilus?, Fisch. 



Similar to Calopus in the legs and insertion of the antennae; but 

 these latter organs are simple, with their second joint obconical like 

 the third, and at least half as long(4). 



Dttilus, Fisch. Helops, Dryops, Necydalis, Fab. (Edemera, Oliv. 



Where the legs are also of the same thickness, or nearly so, in 

 both sexes, but where the antennae, always filiform, are inserted be- 

 fore the eyes. The elytra are not subulate or abruptly narrowed 

 towards the extremity(5). 



CEdemera, Oliv. Necydalis, Dryops, Fab. 



Where the posterior thighs are strongly inflated in one of the 

 sexes, where the antennae are usually long and smaller at the extre- 

 mity, and the elytra suddenly narrowed near the end(6). 



The fifth and last tribe of the Stenelytra, that of the Rhyn- 

 chostoma, is composed of Insects, some of which, such as 



(1) Oliv., Encyc. Method., article Nothus. See Schrenh., Synon. Insect, I, 

 iii, App., p. 8. 



(2) See the family of the Rhynchophora. 



(3) Calopus serraticornis, Fab.; Oliv., Col. IV, 72, 1, 1- 



(4) Calopus testaceus, Schcenh., Synon. Insect, I, iii, p. 4 11; Pedilus fuscus, 

 Fisch., Entom. Imp. lluss., I, iv. 



(5) Dytilus helopioides, lb., I, v, 1;D. rufus, lb., 2, and the CEdemerae with 

 simple thighs of Olivier. 



(6) The CEdemerae of Olivier with inflated posterior thighs, and subulate elytra. 

 See Encyc. Method., article (Edtmhe 



