COLEOPTERA. 
411 
AVe might separate from them some species* * * § in which the body 
is almost globular, and where the last joint of the four anterior tarsi 
is very small and projects but little beyond the preceding one — 
Hyphydrus, Lat. — The body of the rest is oval, and not so thick f. 
Sometimes the antennae are slightly dilated and wider in the middle 
of their length ; the last joint of the labial palpi is emarginate, and 
appears forked. 
Noterus, Clairv. 
No scutel ; tarsi consisting of five distinct joints, and the two first 
of the four anterior dilated in the males, forming an elongated 
palette ; first joint of the two anterior tarsi covered by a broad lamini- 
form spur, the part of the pectus bearing the last legs with a deep 
groove on each side 
The others have but ten distinct joints in their antennee ; their 
exterior palpi are fusiform, or have a more slender termination taper- 
ing to a point, and the base of the posterior legs is covered with a 
large shield. 
The body is convex and ovoid underneath, as in Hygrobia ; but 
there is no scutel, and all the tarsi are filiform, composed of five 
almost cylindrical joints, and have nearly the same form in both 
sexes. They are the 
Haliplus, Lat .' — Hoplitus, Clair . — Cnemidotus, IlUg. § 
The second genus of the Hydrocanthari, or the 
Gyrinus, Lin . 
Comprises those in which the antennae are clavate and shorter 
than the head ; the two first legs are long and project like arms ; the 
remaining four are compressed, Avide, and pinnate. There are four 
eyes. 
The body is oval and usually very glossy. The second joint of 
the antennae, which are inserted in a cavity before the eyes, is pro- 
longed exteriorly in the form of an auricle, and the folloAving 
joints II are very short, croAvded, and united in one almost fusiform 
and slightly curved mass. The head is sunk in the thorax almost 
to the eyes, Avhich are large, and diAuded by a border, in such a AA’ay 
that tAVO are above and tAvo underneath. The labrum is rounded 
and strongly ciliated before. The palpi are very small, and the 
* Tlie Hyd. gibba, ovalis, scripta, Fab. ; Hyphydrus lyratus, Schoenh., Synon. Insect., 
II, iv, 1. 
•f- The Dytisci inaqualis, relicvlatus, conflv.ens, picipes, picivs, geminus, lineafus, ha- 
lensis, duodecwi-pustulatus, dorsalis, sex-pus/ulaius, paluslris, deprcssus, litui ah's,ptamis, 
erythrocephalus, nigrifa, granularis, Fab. See Schcenlierr, Synon. Insect. II, penus 
Hyphydms ; — Panz., Index Entom., genus Bydroporvs ; — and Clain ., Entom. Helv. 
II, the same genus. 
X Dytiscus crassicornis, Fab. ; Clairv., Entom. Helv., II, xxxii. 
§ The Dytisci fulvus, impressus and obliquus, Fab. See Latr., Gener. Crust, et 
Insect., I, p. 234 ; Clairv., Entom. Helv., II, genus Hoplitus, XXXI ; Panz., Ind. 
Entom., genus id., and Schcenherr, Synonym. Insect. II, genus Cnemidotus. 
11 But sevcu are distinctly visible, tbe first and last of Avhich are the longest. 
