HYDROPORUS. 29 
and darker-coloured legs, with markedly shorter claw-joint to the front and middle 
tarsi. 
4, Hydroporus decemsignatus. 
Hydroporus decemsignatus, Clk. Ann. & Mag. Nat. Hist. ser. 3, x. p. 176°. 
Hab. Mexico (Truqui'). 
This is no doubt a very variable species in respect of the markings, and is closely 
allied to H. nebulosus; but, independent of the very different colour, it is of shorter 
and broader form. 
5. Hydroporus libens. 
Hydroporus libens, Sharp, Trans. Roy. Dubl. Soc. n. s. 11. p. 446. 
Hab. GuatEMALA, Guatemala city, 5000 feet (Champion). 
This is very similar to the black varieties of H. decemsignatus; but it is smaller and 
narrower, and the fine punctuation of the surface is more obsolete, and the legs are 
shorter. 
6. Hydroporus nebulosus. 
Ovalis, convexus, latiusculus, subnitidus, ferrugineus, capite, thorace elytrisque fusco signatis, abdomine pecto- 
reque nigricantibus; elytris subtilissime punctatis, seriebus tribus punctorum, prima suturali punctorum 
profundorum, secunda conspicua, tertia externa obsoleta ; corpore subtus subopaco, subtilissime coriaceo, 
minus profunde ruguloso. 
5 1: 
Long. 2, lat. 1,5, lin. 
Hab. Mexico, Guanajuato (Dugés, coll. Sallé). 
This species is very closely allied to H. mexicanus; but it is smaller, and the upper 
surface is less convex, and the sculpture throughout is finer; the colour in the two 
is very different; but as this is no doubt subject to considerable variation, little import- 
ance can be at present attached to it. In this species the colour of the upper surface 
is ferruginous (perhaps in fresh individuals yellow) ; there is a large dark mark near the 
eye on each side, the two being nearly or quite united. The front margin of the thorax 
is dark ; and there is a large dark mark at the base on each side of the middle. On the 
wing-cases the dark marks are very indefinite, and consist of small nebulosities more 
or less connected together ; the series of punctures become obsolete before the extremity, 
the sutural series reaching nearer to the apex than do the others. 
I do not know the sex of the two individuals before me, which are in a bad state of 
preservation ; but I believe them to be males. 
7. Hydroporus interjectus. 
Ovalis, latiusculus, convexus, niger, dense subtiliterque punctatus, subopacus, antennarum basi testacea, pedibus 
anticis piceo-rufis, posticis nigris; elytris serie suturali punctorum profundorum, preter hanc seriem 
