Rev. H. Clark on the Mexican Species of Hydropori. 177 



punctate- striate, of a dull black colour : head broad, im- 

 punctate, with two insulated depressions, one on either side of 

 the inner margin of the eyes, in colour black, the basal line 

 and also the apex being obscurely tinged with rufous : thorax 

 broad, the lateral margin being much constricted towards the 

 front, and in a continuous line with the lateral margin of the 

 head ; the surface (under a high power) is obsoletely rugose ; 

 parallel with the anterior margin is a line of faintly impressed 

 punctures ; in colour black, with a medial circular spot of suf- 

 fused rufous (in a second example there is a distinct trace of a 

 similar suffused rufous marking near the margin) : elytra broad, 

 attenuated towards the apex, with three lines of faintly impressed 

 punctures — one near the suture, another medial, and a third at 

 some distance from the lateral margin ; the surface is of a dull 

 black colour, with five markings of flavous on each elytron — one 

 at the base, transverse and parallel to the margin (sometimes con- 

 tinued at the shoulders in a line parallel to the lateral margin) ; 

 the four others are smaller, of equal size, in form either sub- 

 circular or somewhat quadrate ; of these, two are near the lateral 

 margin, one is situate at the apex, and a fourth medially near 

 the suture : abdomen and underside fusco-rufous, sometimes 

 almost black : antenna testaceous : legs, the anterior rufo-testa- 

 ceous, the posterior fusco-rufous. 



This species may be separated at once from all others by the 

 very distinct flavous markings on its elytra. 



I know of only two examples of the species, both taken by 

 M. Truqui in Mexico : one in the collection of Mr. Fry ; the 

 other, by that gentleman's kindness, in my own. 



3. Oblongi. 

 6. H. Wardii, n. sp. 



H. ovatus, elongatus, subdepressus, punctulatus ; thorace flavo, ad 

 medium fusco ; elytris leviter striatis, rufo-ferrugineis, ad basin et 

 suturam flavis ; pedibus rufo-flavis ; antennis flavis. 



Long. corp. 2 lin., lat. 1 lin. 



Ovate, depressed, subelongate, finely punctate, rufo-fuscous : 

 head broad ; when viewed from above, a slight depression may 

 be traced near the inner margins of the eyes; the surface is 

 glabrous, finely punctate, aud flavous, the line of the base and 

 of the inner margins of the eyes being black : thorax broadly 

 transverse, narrow, the anterior margin straight ; the sides are 

 somewhat constricted in front; the basal margin (medially) 

 broadly punctate; the surface, obsoletely punctate and with a 

 distinct line of deeper punctures parallel to the anterior margin, 

 is in colour flavous, with a medial suffused spot of fuscous, the 



Ann. $ Mag. N. Hist. Ser. 3. Vol.x. 13 



