154 SUPPLEMENT. 
16 (a). Bidessus pullus. 
Hydroporus pullus, Lec. Proc. Ac. Phil. 1855, p. 294°. 
Bidessus pullus, Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 868°. 
Hab. Nortu America! 2.—Mexico, Tupataro in Guanajuato (Hoge). 
Four examples of a Bidessus obtained at Tupataro, though differing much inter se, 
I cannot separate from this species, which is widely distributed in North America, 
but very imperfectly known to me. — 
Bidessus adumbratus (p. 25). 
To the localities given, add:—Mexico, San Juan Bautista in Tabasco (Hége) ; 
Panama, San Miguel in the Pearl Islands (Champion). 
DERONECTES (p. 26). 
Deronectes xquinoctialis (p. 27). 
To the Mexican localities given, add :—Northern Sonora (Morrison). 
In this district the late Mr. Morrison obtained both the typical form and a small 
dark variety, which may possibly prove to be distinct. 
2. (a). Deronectes grammicus. 
Suboblongus, opacus, ferrugineus, supra nigro-testaceo variegato, elytris lineis elongatis ornatis; dense minuteque 
punctatus; elytris stria suturali posterius abbreviata striaque juxta hanc magis profunda et elongata; 
antennis pedibusque testaceis, illis extrorsum tibiisque fuscis, tarsis piceis. 
Long. 54, lat. 3 millim. 
Hab. Mexico, near the city (Hoge). One example 
This remarkable Deronectes is of more elongate form than any of the others of our 
region, and is readily distinguished by the numerous elongate lines of colour on the 
elytra. The antenne are elongate; the head is yellow, with the margins of the eyes 
black ; the thorax is yellow, black on the front margin, and with a large double black 
mark at the base; the elytra bear alternate lines of black and yellow colour, and are 
spotted with yellow at the sides. The hind coxal cavities are very distinctly separated. 
HYDROPORUS (p. 28). 
7 (a). Hydroporus corvinus. 
Ovalis, convexus, absque pubescentia, opacus, niger, elytris ad latera et ad basin interdum testaceo-signatis, 
pedibus piceis, antennis testaceis extrorsum fuscescentibus ; elytris serie suturali punctorum, punctisque 
obsoletis irregulariter adjectis; prothorace punctato, ad latera et ad basin subrugoso. 
Long. 4, lat. 24 millim. 
Hab. Mexico, Northern Sonora (Morrison). 
This species is closely allied to H. addendus; but besides differing much in colour, it 
