96 Mr, G. Lewis on 



But it is necessary to note tliat in otlier genera the strise 

 only help to identity certain species. In Plmsius and Placodes 

 they can only be used as specitic characters. Plcesius cossy- 

 phus, Mars., and sfriatipecfus, Lew., are extremely similar, 

 but the latter alone has a bistriate prosternura, and the same 

 differences clearly separate ellipticus, Mars., from javanus^ 

 Er. In the genus Placodes, coffer, Er., has strige, and they 

 are wanting in eheninus, Lew., species which otherwise are 

 superficially very much alike. 



It is to be regretted that at the present time there are 

 genera which are not well defined, notably Lioderma^ Apo- 

 hleies, Phelister, and otliers, but, as time goes on, with in- 

 creasing knowledge, some future student of the group may 

 see a way to point out some salient characters not at present 

 obvious, and, perhaps, by further subdivision introduce a 

 more intelligent systematic arrangement. 



Marseul's monograph will, however, remain the initial 

 work on the family, and the figures of the species, drawn by 

 him at the time of w^-iting his descriptions, are so charac- 

 teristic that they lead generally to the certain identification 

 of the species. But in his time more material was wanted 

 for an efficient classification, and not much advance has been 

 made since for the same reason. 



List of Genera and S^yecies. 



I^ioderma pervalidiini, Blaisdell. Ilister similis. 



Hyp()st)leniis, gen. iiov. Microlister Sheppardi. 



Apobletes pceiialis. Margariuotus, Marseul. 



piimicatus. Carcinops Voulogeri, Thery. 



l*latvlister uiponeusis, Leio. Mouoplius Braunsi. 



Platysoiiia geriuauum. Probolosternus brevistrius. 



Coriiillus, gen. nov. Exosternus rufulus. 



Contipus, Marseul. Reniuiis Salvini, Leiv. 



Eugiamniicus, gen. nov. pimcticoUis, 



Zabromorpluis ordinarius. Eretmotus plauifrous. 



Coptochilus, Rey. foveisternus. 



Hetei-ognathus,'i?<7/. Onthopliilus niponensis. 

 Ilister jNlarseuli. 



Lioderma pervalidum, Blaisdell, Lew. Ann. & Mag. Nat. 

 Hist. xiv. p. 139 (1904). 



L. 12-16 mill, (absque mandibulis). 



A series of this Californian species has been sent to me, 

 and I n.nderstand that it will be shortly described in America. 

 It is very distinct from yucatecum, Mars., by its more 

 elongate and parallel outline, by being slightly more convex, 

 by tlie second dorsal .stria being complete, by the elytra being 



