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



notatis ; pedibus rufo-testaceis, femoribus posticis nigro suffusis ; 

 abdomine nigro. 

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



Oval, somewhat produced, punctate-striate, black : head broad, 

 on either side in front is an obsolete depression; the surface 

 (under a high power) is very finely and thickly punctate, in co- 

 lour black ; near the line of the base a narrow transverse band 

 of flavous is well defined : thorax broadly transverse, the ante- 

 rior margin excavated ; the sides subparallel and rounded in 

 front, very narrowly and evenly marginate ; the line of the base 

 is broadly angulated at the region of the scutellum ; the surface 

 is finely and thickly punctate and medially somewhat rugose, 

 with a row of minute punctures parallel to the anterior mar- 

 gin ; near the base it is medially transversely depressed, in 

 colour fuscous black, with a post-medial marking (sometimes 

 almost obsolete, sometimes subcircular and suffused) of flavous : 

 elytra somewhat acuminated at the apex ; the shoulders are 

 sufficiently prominent, thus forming an angle with the line of 

 the margination of the thorax ; the surface is very finely punc- 

 tate, with six deep punctate striae (more obsolete near the mar- 

 gins and apex) of a dull black colour, three or four obsolete 

 markings of flavous being more or less distinct near the line of 

 margination : abdomen and underside black : legs flavous, the 

 apical joints being fuscous. 



More deeply striated, narrower, and darker than H. cequi- 

 noctialis, and unmarked on the elytra by longitudinal flavous 

 lines. 



A single specimen, taken between Nopaluca and Vera Cruz 

 by M. Truqui. 



10. H. infacetus, n. sp. 



H. parallelus, punctatus, rufo-ferrugineus ; capite flavo, ad medium 

 rufo-fusco ; thorace rufo-flavo ; elytris rufo-ferrugineis, ad basin 

 flavo lineatis, sutura fusca ; pedibus antennisque rufo-flavis. 



Long. corp. If lin., lat. -f lin. 



Parallel, subovate, thickly punctate, rufo-ferruginous : head 

 finely punctate, flavo-testaceous ; near the inner margin of the 

 eyes is a longitudinal suffused marking of rufo-fuscous : thorax 

 transverse, finely punctate, rufo-flavous : elytra subparallel, suf- 

 ficiently robust, the sides near the anterior angles forming an 

 obtuse angle with the sides of the thorax ; the surface is thickly 

 punctate and rufo-ferruginous, the anterior margin and also the 

 longitudinal medial lines being flavous; these lines, three or 

 four in number, are more or less obsolete ; the extreme apex is 



