DYTISCID. 755 
has a narrower prosternal process, so that it is no doubt distinct. Of the three examples 
received one is quite black, and the other two have an obscure yellow mark at the base 
of each wing-case, and two spots at the side, and also an indistinct spot on the disc of 
the thorax. 
10 (a). Hydroporus civicus. 
Oblongo-ovalis, niger, dense punctatus, evidenter pubescens; capite prothoracisque lateribus rufescentibus ; 
pedibus rufis, antennis fusco-rufis. 
Long. 4-5 millim. 
Mas subopacus, subtiliter punctatus; tarsis anterioribus latis. 
Fem. omnino opacus, obsolete punctatus ; tarsis anterioribus sat latis.. 
Hab. Mexico, Ciudad in Durango (Hége). 
Allied to H. modestus, but more oblong in outline, with the punctuation not quite 
so dense and fine, and the tarsi much broader ; the front claws of the male are curvate 
and nearly equal, the posterior one being, however, more abruptly bent at the base. 
The broad feet of the male will permit of the identification of the species without 
much difficulty. A good series was obtained exhibiting no variation in addition to the 
sexual differences. 
10 (8). Hydroporus axillaris. 
Hydroporus axillaris, Lec. Proc. Ac. Phil. 1855, p. 293°; Sharp, Trans, Roy. Dubl. Soc. n. s. ii. 
p. 479°. 
Hab. Norta America! ?,—Mexico, Northern Sonora (Morrison). 
There is some doubt whether this is really Leconte’s species, as the only example I 
examined of that insect 2 was deprived of its feet, and is not now in my possession. In 
our insect the male and female are very similar, but the male has the anterior claw of 
the front foot much shorter than the other claw. 
12. Hydroporus vilis. 
Hydroporus vilis, Lec. Ann. Lye. N. York, v. p. 208°; Sharp, Trans. Roy. Dubl. Soc. n.s. ii. p. 4842, 
Hab. Nortu Amertca !2,—Mexico, Northern Sonora (Morrison), Guanajuato. (Hoge). 
AGABUS (p. 32). 
2 (a). Agabus ——? 
Hab. Mexico, Villa Lerdo, Durango (Hége). 
We have received a single female example of an Agabus very similar to the European 
A. biguttatus, but with a rather smaller thorax, and there is little doubt it will prove 
distinct from any of the North-American allied forms. 
5 DD 2. 
