52 Major Parry's Dcscriiitioit of n netr Cdntltaroh'.tlirm. 



the ^ of Gautharolethrus Luxeri C. StemJieili is closely allied 

 to a BiicMeyi, (Trans. Ent. Soc, 1872, p. 77, Tab. 1, figs. 1 

 and 2), but is at once distinguished by its more conspicuously 

 dillated thorax, by its head being almost quadrate instead of nar- 

 rowed at the base as in C. Bacldeyi, and further by its mandi- 

 bles being opaque and slightly concave on their upper surface 

 instead of shining and convex, moreover their apical bifurcation 

 is much stronger and the sub-apical tooth more acute and situate 

 closer to the apex : judging from the extraordinary difference in 

 the size of the female, the var. viK,r. of the male must i>rove to 

 be of very considerable magnitude. 



C. Steinheili, Parry, n. S2). {^. var. max.). 



C. niger, capite prothoraceque nitidis, valde varioloso-puncta- 

 tis, elytris subvelutinoso-opacis. 



MandiJmlii' depressai, granulosa^, apicibus acutis. Gapid mag- 

 nuui, (piadratum, angulis anticis rotundatis, in medio ad basin 

 sat profunde foveatum. ArdeniuH nigra;, capite mandibulisque 

 paulo longiores, articulis cylindricis, clava griseo-velutinosa. 



Prothorax transversus, valde varioloso-punctatus, in medio 

 late canaliculatus, disco irregulariter rugoso-lineato ; lateribus 

 semicirculariter arcuatis, regulariter minute nodoso-serratis ; angu- 

 lis posticis emarginatis, vix dentatis. Elytra paulo depressa, 

 sub lente crebre regulariter punctata ; humeris prominulis, tuber- 

 culo minuto nodoso instructis, linea utrinque erosa sinuata,ab 

 angulo humerali fere ad medium discendente, notata. Sentellum 

 nitidum, grosse et profunde punctatum, linea laterali glabra. 

 Corpus subtus nitidum, grosse et profunde punctatum; abdomen 

 minute punctulatum. TihUi' omnino muticcB. Long. cers. 

 (mandib. incl.) unc. 1, lin. 3. 



Hab. Columbia. Mus. Hteinheil. 



Both from the description and figure of G. Reichei it is impos- 

 sible, I think, as has been suggested to me, to affiliate thereto 

 the insect now described. The very remarkable difference in the 

 form of the thorax is alone sufficient to separate the two species ; 

 in G. Steinheili this segment is considerably wider, with the 

 sides evidently more arcuate and much less serrated, and finally 

 the strong spine, so prominent in the posterior angle of G. Reichei, 

 is totally absent, and I reiterate my opinion that G. Reichei will 

 in all i)robability prove to he the $ of G. Laxeri. 



