2G'4 CANARIAN COLEOPTERA. 



detect : so that I have no option but to treat it as congeneric with 

 the ten insects just enumerated. But having hitherto looked upon 

 the Aphmmrthra as essentially of Eiqjhorbia-iniesting propensities, 

 I must confess that I am somewhat loath to associate with them a 

 species of another mode of life, and (in the majority of its characters) 

 of a very ojjposite aspect. 



The A. concolor, so far as I have observed hitherto, is confined to 

 the rotten trunks of the Finns canariensis, of intermediate and rather 

 lofty elevations, — beneath the dead bark of which I have taken it at 

 the Agua Mansa in TenerifFe, and in the Barranco above S'^'' Cruz in 

 PaLma. 



Genus 176. TRIOTEMNUS (nov. gen.). 



Corpus, antennce et pedes fere ut in Aplianarthro, sed funiculo di- 

 stincte 3-articulato, articuUs 2*^** et 3"" parvis (nee minutissimis), 

 inter se aequalibus, capitulo solidissimo compresso (nee 4-annu- 

 lato) ; ehjtris apice subretusis (nee omnino integris) ; colore ob- 

 scure (ut in Tomicidis typicis), nee Isete variegate. 



A rpels, tres, et re^i'w, seco. 



Although unwilling to erect a genus for the reception of a unique 

 insect which has nothing anomalous in its structure, yet the present 

 species is so completely removed from Aphanarihrum (the only other 

 group, I believe, except Hypothenemus, as yet enunciated, in the To- 

 m'lcidce, with a professedly 3-jointed funiculus) that I am compelled 

 to separate it therefrom. As above defined, the funiculus in Trio- 

 temnus is very conspicuously triarticulate (whereas in Aiihanarthrum 

 it seems doubtful whether that organ has in reality more than two 

 joints*), the second and third joints being comparatively distinct, 

 and of equal dimensions, and the club (instead of being quadriarti- 

 culate) is extremely solid and compressed ; moreover the former is 



visible from the oblique implantation of the funiculus into the club (for I believe 

 that I can just detect one in, at all events, the Madeiran A. ewphorbice); never- 

 theless, even under the liighest power of the microscope, I cannot satisfy myself 

 that it exists in the generality of the species. In the figure given of the A. euphor- 

 hi<B in my 'Ins. Mad.,' this infinitesimal exti'a articulation is made very much 

 too conspicuous. 



* Vide the observations (Trans. Ent. Soc. Lond., 3rd series, i. 165) in my Paper 

 "on the EupliQr}tia-\\\ie%i\x\g Coleoptera of the Canary Islands," where I implied 

 that I was doubtful whether the funiculus of Aphanarihrum could be regarded, 

 after all, as more than biarticulate ; for although in my original diagnosis of the 

 gi'oup (Ins. Mad. 292) I affirmed that portion of the antennre to be 3-jointed, 

 and although I still tliink that I am able to detect a third, infinitesimal joint in 

 the particular species (the A. ciiphorhia') on which the genus was established, yet 

 I have been so completely unable to satisfy myself of the presence of more than 

 two articulations iia the funiculi of any of the Canarian Aphanarthra, that I am 

 half inclined to believe that the supposed additional one in the Madeiran A. eu- 

 phorhice may perhaps be more apparent than real. 



