HYDROVATUS. 15 
1. Hydrovatus obscurus. 
Brevissimus, convexus, nitidus, sordide testaceus, elytris versus apicem impunctatis, circa humeros sat crebre 
vix fortiter punctatis; coxis posticis fortiter punctatis. 
Long. 13, lat. ? lin. 
Hab. Guatemaa, Paso Antonio, 400 feet (Champion); Panama, David (Champion). 
This obscure little insect is allied to Hydrovatus brevipes, but can be readily distin- 
guished by the impunctate apical portion of the elytra. The specimens before me all. 
have the surface shining ; and I cannot assure myself of any distinct differences in their 
tarsi: but certain of them have the punctuation about the shoulders rather coarser and 
closer; and these, I believe, are the females. If this be the case, the species is 
remarkable from the fact that the surface is as shining in the female as it is in the 
other sex. The punctuation of the basal portion of the elytra is rather coarser and 
deeper in the two individuals from Chiriqui. 
2. Hydrovatus inornatus. 
(Fem.) Brevissimus, latus, sat convexus, sordide testaceus, opacus, sparsim subtilissimeque punctatus; coxis 
posticis fortiter profundeque punctatis. 
Long. 13, lat. 3 lin. 
Hab. Mexico, Oaxaca (Hége). 
This species is remarkable from the extremely fine punctuation of the upper surface. 
The unique individual is no doubt a female; for it has the front and middle tarsi very 
narrrow; the antenne are rather slender, but distinctly serrate. It is probable the 
upper surface may be more shining in the male. It may be placed near H. brevipes 
and H. compressus, although, in respect of the obsolete punctuation, it is more nearly 
approached by H. clypealis. 
3. Hydrovatus lecontei. 
Hydroporus leconteii, Clik. Ann. & Mag. Nat. Hist. ser. 3, x. p. 175°. 
- Hab. Mexico}. 
Mr. Fry informs me that the type of this, as well as of most of the other Mexican 
Hydroporides described from his collection by the late Hamlet Clark, was unfortunately 
lost by the describer previous to his decease. It is doubtful from the description 
whether a Celambus or a Hydrovatus is its subject; but I think the latter the more 
probable supposition. 
4. Hydrovatus major. 
Hydrovatus major, Sharp, Trans. Roy. Dubl. Soc. n. s. 11. p. 335. 
Hab. Guatemata, Duefias (Champion). 
