214 J, L. LECONTE, M. D. 



the upper and lower surface find their homologies only in Hrcntliid.-c 

 and k'r's accurately in llhysodidju and Cupesidae. The prominence 

 of the <iular niarj^in and the clase attachment of the nientum is au 

 exagf^eration of wliat is seen in /'Jiipsalts % , but the presence of two 

 gular sutures is quite inconsistent with a Rhynchophorous affinity. 

 The prolongation of the hind angles of the head, and their coaptation 

 to the slight excavation of the anterior part of the episterna of the 

 prothorax is a singular character, and cannot be used for any purpose 

 of comparison; so far as it goes it indicates a Clavicorn type. The 

 antennic are remarkable for the simplicity of their form, and the 

 absence of distinct sensitive surface; in this respect they resemble 

 those of Rh//so(hs ; but the presence of faint traces of sensitive sur- 

 face on the front side of the fourth and following joints indicates a 

 power, with slight modification, to represent the structures seen in the 

 Serricorn, Jjamellicoru and Clavicorn series; and by a depression of 

 these surfaces into pits the Parandride or Spondylide forms among 

 the Ijongicorn series may be produced ; but I must here observe, that 

 Scollditt of the tribe Passandrini, belonging to Cucujidoe, has antennae 

 ■which greatly resemble those of Ili/pocephaius, except that the joints 

 are munded; these organs thus become in Scalidia moniliform, as 

 in JlhjjwiJcs. 



The large perpendicular genal processes can be homologized* only 

 with the plates which extend forwards, each side of tlie metitum. in 

 Passarjihiui, but being turned downwards, and utilized lor the purpose 

 of aiding in the peculiar movement of the mandibles, the base of the 

 maxilinc is of course left exposed. 



Tlie prothorax, though margined at the side, is eminently suggestive 

 of the JirenthidiC, both in form and absence of sculpture; the pres- 

 ence of a distinct suture between the pronotuin and episterna, con- 

 joined with the complete union, without suture, of the episterna with 

 the epimera, is entirely anomalous, and does not occur in any other 

 genus, so far as known to me. The wide presternum, and the fine 

 straight lateral sutures are just as in Brenthid;e, but the prolongation 

 of the presternum backwards is again quite abhorrent to the Kliyn- 

 chophorous type. The emargination of the prosternum in front is a 

 Rhynchophorous character, but the thickening of the edge and the 

 coarse serrations are unknown in any other genus, and are eminently 

 not Longicorn characters. 



The thinning out of the basal edge of the prothorax, and the entire 



* Westwood, Arc. Nat. 1.35 sqq., has mentioned this homology. 



