] 78 Rev. H. Clark on the Mexican Species of Hydropori. 



basal line being also medially and broadly black : elytra attenuate 

 towards the apex, finely and thickly punctate, throughout gla- 

 brous; near the anterior margin, traces may be discerned of 

 three obsolete striae, which become evanescent before the middle; 

 in colour rufo-ferruginous, the line of suture, the anterior mar- 

 gin, and the lateral margins being more or less flavous; this 

 flavous coloration is most apparent near the shoulders, but varies 

 somewhat in degree : abdomen and underside black : le^s rufo- 

 flavous : antenna flavous, the apical joints being medially suffused 

 with fuscous. 



H. Wardii resembles in general appearance H. nubilus, Le- 

 conte, a species found in Kansas : it is more glabrous, less deeply 

 punctate; and in H. nubilus, Lee, there is no trace of punctate 

 striae on the elytra. 



Mexico. In the collection of the Rev. Hamlet Clark. 



7. H. Kingiij n. sp. 



H. ovatus, subdepressus, punctulatus ; thorace nigro, marginibus 



flavis ; elytris rufo-fuscis ; pedibus antennisque rufo-testaceis. 

 Long. Corp. 1^ lin., lat. f lin. 



Ovate, broad, subdepressed ; when seen under a high power, 

 finely and sparingly punctate; glabrous, darkly castaneous : 

 head broadly transverse, impunctate, black : thorax broadly 

 transverse, the sides rounded in form, the marginal line being 

 continuous with that of the sides of the elytra and also 

 of the head ; the anterior margin is straight, the anterior 

 angles being subprominent ; parallel to the anterior margin 

 is a row of minute punctures ; the surface generally is impunc- 

 tate and glabrous, with faint traces near the base of obsolete 

 punctures; in colour black, the sides being suffused more or 

 less broadly with flavous : elytra sufficiently robust, towards the 

 apex subacuminated (but not so distinctly as in H. Wardii) ; the 

 surface is finely and somewhat sparingly punctate throughout, 

 with a single medial stria of closely-arranged minute punctures 

 on each elytron : abdomen and underside black : legs and antenna 

 rufo-testaceous. 



A much smaller insect than H. Wardii, though similar to it 

 in form ; not unlike H. suturalis, Leconte, but more parallel and 

 a trifle narrower. 



Taken by M. Truqui in Mexico. 



8. H, aquinoctialis, n. sp. 



H. oblongo-ovatus, subdepressus, confertissime subpunctatus, fusco- 

 niger ; capite laevi, ad basin obsolete punctato, nigro, ad medium 

 suffuse rufo ; thorace sat lato, subtiliter rugoso, lateribus haud 

 marginatis, cum elytrorum humeris angulum valde obtusum for- 

 mantibus, rufis, ad medium baseos nigro binotatis ; elytris 4-striatis, 



