6o CAXAEIAN COLEOPTERA. 



serrato seel utrinque magis angiilato-sinuuto ; elytris oblongioribus 

 (minus ovatis), punctato-striatis (nee striato-punctatis), pnnctis 

 panlo minoribus necnon interstitiis sensim costato-elcvatioribus ; 

 palpis siiblongioribus. — Long. corp. lin. 1. 



Habitat TeneriiFam, a Dom. W. D, Crotch semel tantum lecta. 



Of the present Hydrmia I have seen hitherto but a single example, 

 which has been taken recently by Dr. Crotch in TenerifFe, — he he- 

 lieves, at Ycod el Alto. It is wcU distinguished by its (ahitaceous, 

 though strongly pimctured) prothorax being much sinuated on either 

 side, so as to form almost an angle about the middle ; and by its 

 elytral interstices being perceptibly raised, or costate. Its surface, 

 under a high magnifpng power, will be seen to be sparingly be- 

 sprinkled with an extremely minute and scarcely traceable piibes- 

 cenee. In size and outline it is perhaps nearer than even the H. 

 serncoUis to the Eiu-opean H. bicolor ; nevertheless its totally dif- 

 ferent (laterally-sinuated, alutaceous) prothorax, rather smaller ely- 

 tral punctiu'es, and more elevated interstices will, apart from minor 

 characters, readily separate it from that insect. 



From the H. serricoUis its distinctions have been fuUy pointed 

 out in the diagnosis; nevertheless I may just mention that its rather 

 larger size and more elongate outline, in conjunction with its some- 

 what more produced (though apically-broader) head, more prominent 

 eyes, more laterally-sinuated, alutaceous prothorax, less coarsely 

 punctured elytral striae, more costate interstices, and rather longer 

 palpi, will prevent its being confounded with that species. 



142. Hydrsena serricollis, n. sp. 



//. elongato-ovata, piceo-brunnea, subnitida ; capite prothoraceque 

 profunde et rugose punctatis, illo nigrescente, hoc inajquali, in 

 medio dilatato, postice sat constricto, ad latera (oculo armato) di- 

 stincte serrato ; elytris ovatis, profunde striato-pimctatis (i^unctis 

 maximis) ; antennis ad basin, palpis pedibusque rufo-testaceis. — 

 Long. corp. lin. vix 1, 



Habitat Teneriffam, per marginem rivuH ad Agua Garcia capta. 



Known from the following species by its larger size, broader and 

 more ovate outline, darker hue, and very much more deeply sculp- 

 tured surface ; by its prothorax being rounded (and more coarsely 

 crenulated) at the sides, and constricted posteriorly ; and by its limbs 

 being robuster and more rufescent. At first sight it is somewhat 

 allied to the common European H. testacea ; but it is relatively a 

 little wider and more ovate than that insect, its prothorax is a good 

 deal rounder laterally and narrower behind, more uneven on the disc, 



