Rev. H. Clark on the Mexican Species of Hydropori. 183 



flavous, with three or four obscure fuscous lines extending from 

 the base nearly to the apex : abdomen and underside rufo-fiavous : 

 legs and antenna rufo-testaceous. 



H. Charlottii approaches in character to H. Magensis -, it is 

 broader, the apex of the elytra is somewhat less attenuated, and 

 its coloration is entirely different. The species very closely 

 resembles a pale variety of H. nanus, Aube { = H. affinis of Say), 

 examples of which I have received from Dr. Leconte. The 

 species before us is larger, a trifle more parallel in form, the 

 longitudinal markings on the elytra are less distinctly defined, 

 and the punctures on the elytra are less distinct. 



Taken by M. Truqui in Mexico. 



14. H. Emilianus, n. sp. 



H. ovatus, impubescens, punctatus, rufo-ferrugineus ; capite flavo, 

 ad medium fusco suffuso ; thoracis lateribus flavo suffusis ; elytris 

 punctatis ; antennis rufo-flavis. 



Long. corp. f lin., lat. f lin. 



Ovate, impubescent, thickly and finely punctate, rufo-ferrugi- 

 nous : head transverse, impunctate, glabrous, in colour flavous, 

 the inner margins of the eyes near the base being suffused with 

 fuscous : thorax transverse, the sides subparallel and constricted 

 in front ; the surface is glabrous and finely punctate, more di- 

 stinctly near the base ; on either side of the middle, connected 

 with the line of the base, is a short, well-defined, longitudinal 

 fovea: elytra parallel, subattenuate near the apex, thickly but 

 obsoletely punctate ; at the anterior margin (halfway between 

 the humeral angles and the suture) is a short longitudinal fovea, 

 corresponding in position to the thoracic fovea; the surface in 

 colour is rufo-ferruginous or fuscous, the sides being more or 

 less distinctly suffused with flavous : abdomen and underside dark 

 fuscous ; legs flavous ; antenna rufo-flavous. 



Closely allied to H. Magensis, from w hich, however, it may be 

 separated by its smaller size and its glabrous and impubescent 

 elytra, as well as by its coloration : it is somewhat smaller, more 

 ovate, and less parallel than H. nanus, Aube, more nearly related 

 still to H. erythrostomus, Man., a northern species, found in 

 Russian America. 



I have three examples of H. Emilianus before me, from Mr. 

 Fry's and my own collections, all from Mexico, though doubt- 

 less taken in different localities. I can trace no tendency to 

 variation in the species. 



15. /f. adumbratus, n. sp. 



H. oblongo-ovalis, punctatus, pubescens ; capite fusco, interdum 

 antice rufo-fusco ; thorace flavo, ad basin plus minus fusco ; ely- 



