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A REVISION OF THE GENUS SYNTHOCUS, Schonh., 

 AND ITS ALLIES (CURCULIONID^). 



By Guy A. K. Marshall, F.Z.S. 



(Plate VI.) 



It has already been pointed out (p. 53, szipra) that the genus 

 Synthocus, on account of its adelognathous mentum, cannot be 

 retained in the position assigned to it by Lacordaire. Among the 

 Adelognathi its obvious affinities are with Brachycerus, on account 

 of the following characters : the absence of a mandibular scar ; the 

 linear tarsi, which are bare or setose beneath, but never spongy ; 

 and the non-geniculate antennaB. In my opinion, therefore, this 

 genus, together with Brotheus, Steph., and Euryxena, Pasc, should 

 be included in the Brachyceridas as defined by Prof. Aurivillius 

 (Kongl. Sven. Vet. Ak. Handl., xxi. No. 15, 1887, p. 9), forming 

 a third group, to be called Brotheinse, and distinguished from the 

 Microceringp, and Brachycerinse by the very deep prosternal furrow. 



The three genera of this group may be distinguished by the 

 following characters : — 



1. (4) Processus metasterni intercoxalis acuminatus ; coxae medise contiguse aut 



paulum separatee, processu mesosterni intercoxali coxis multo angustiore. 



2. (3) Caput superciliis supra frontem evidenter elevatis ; funiculus versus apicem 



gradatim dilatatus Synthocus, Schh. 



3. (2) Caput superciliis supra frontem numquam elevatis ; funiculus submonili- 



formis, versus apicem vix dilatatus Brotheus, Steph. 



4. (1) Processus metasterni intercoxalis latissime truncatus ; coxae mediae late 



separatee, processu mesosterni intercoxali coxis paulum latiore 



Eunjxena, Pasc. 



SYNTHOCUS, Schh. 



Synthocus, Schh. Gen. Cure, vi., 2, p. 408 (1842)— Type 

 truncatus, Boh. 



Daulaxms, Pasc, Tr. Ent. Soc. L. 1887, p. 333 — Type stolatus, 

 Pasc. 



Head with the superciliary ridges elevated above the level of the 

 forehead ; eyes lateral, depressed, acuminate inferiorly. Eostrum 

 continuous with the head, shorter than the prothorax, more or less 

 curved, slightly dilated towards apex, without furrows or caringe, the 



