DERONECTES. 27 
This is a genus of about fifty species, specially characteristic of the Mediterranean 
region ; two or three species are known from North America, but none from the Antilles 
or South America. 
1. Deronectes striatellus. | 
Hydroporus striatellus, Lec. Ann. Lye. v. p. 207; Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 435. 
Hab. Cattrornia.—Me_xico, Guanajuato (Dugeés, coll. Sallé), Puebla (Sallé), Jalapa 
(Hoge). 
This species varies a good deal in its markings, and not inconsiderably in the distinct- 
ness of the external striz on the wing-cases. 
2. Deronectes zquinoctialis. 
Hydroporus equinoctialis, Clk. Ann. & Mag. Nat. Hist. ser. 3, x. p. 178; Sharp, Trans. Roy. 
Dubl. Soc. n. s. ii. p. 446. 
Hab. Mexico, Puebla, Etla (Sallé), Guanajuato (Dugés, coll. Sallé), Oaxaca, Jalapa 
(Hoge); Guatemala, Guatemala city, 5000 feet, Quiche Mountains, 7000 to 9000 feet 
(Champion). 
At the time I described this species (Joc. cit.) I was acquainted only with a single 
individual, and referred it to the genus Hydroporus because nearly all of the New-World 
allies belong to that genus. I find, however, on dissection, that it is a Deronectes; for 
although the mesosternum and metasternal process appear to be connected, yet on 
extracting the coxe from their cavities it is seen that such connexion does not exist. 
The differences between the sexes are but slight; the female, however, has the thorax 
narrower at the base. The yellow marks on the elytra vary a good deal, and are 
sometimes nearly obliterated. 
3. Deronectes opaculus. 
Ovalis, nigricans, opacus, antennis pedibusque rufo-testaceis, ilarum apicibus, harum tarsis fuscis, elytris plus 
minusve testaceo signatis ; corpore dense subtilissime punctato, elytris stria suturali punctorum. 
Long. 2, lat. 17 lin. 
Hab. Mexico, Guanajuato (Dugés, coll. Sallé). 
This species is somewhat similar to Hydroporus wquinoctialis, Clk., but is rather 
larger and has only the sutural series of punctures distinct. The apices of the coxal 
processes show a peculiar construction, which allows the species to be readily identified ; 
the articular cavities are not contiguous, the partitions separating them being very 
distinctly exposed, and over each, at a little distance from the coxal line, there is a small 
linear or tubercular prominence. The hind tibie have only the serial punctures on 
their infero-external aspect. These characters completely isolate this species; so that it 
will probably prove to be representative of a new group or subgenus. ‘The sculpture of 
the upper surface is similar to that of Hydroporus equinoctialis, except that it is still 
‘ LE 2 
