SS 
em 
' 
INSECTA. 443 
Gerris LATR., FAasr. previously, Hydrometra Fasr., Burm. (in 
part). Four posterior feet very long, remote from anterior. First 
joint of antennee very long. 
Sp. Gerris lacustris, Cimex lacustris L., Stout, Wantzen, Tab. Ix. fig. 63 ; 
Dumérit, Cons. gén. s. 1. Ins. Pl. 36, fig. 6. This species often continues 
wingless ; comp. Gerris canalium, Lion Durour, Anat. des Hémipt. Pl. v. 
fig. 59 ;—Gerris rufoscutellata LaTR., Stout, 1.1. Tab. 15, fig. 108; Cuv. R. 
Ani. éd. ill., Ins. Pl. 92, fig. 5, &e. 
Halobates Escuscu. 
Note.—Species small, apterous, or with little elytra, with abdomen short, 
conical, in tropical seas and the Pacific; comp. EsouscHourz, Hntomogra- 
phien, 1° Lieferung, Berlin, 1822, 8vo. pp. 106—111, Tab. It. figs. 3—5. 
Are they larve (and pupz) of species of genus Gerris? Comp. the figure, 
much resembling a larva recently excluded from the egg, of Lion Durour, 
Anat. d. Hémipt. Pl. xv. f. 178. 
Velia Larr. Feet sub-equally distant, the middle rather longer 
than the rest. 
Velia West., Burm. First joint of antenne longer than rest. 
Posterior femora incrassate, spinose. 
Sp. Veli rivulorum Latr., Gerris rivulorum Fasr., Ent. Syst., Hydro- 
metra rivulorum Fasr., Syst. Rhyng., Cuv. R. Ani. éd. ill., Ins. Pl. 92, 
fig. 4, &e. 
Hydroessa Burm., Microvelia Westw. Last joint of antenne 
longer than rest. 
Sp. Velia pygmea, Lion Durour, &e. 
B. Claws of tarsi apical. 
Hebrus Wrstw., Burm. 
Hydrometra LAr. (species of Hydrometra Farr.), Limnobates 
Burm. Body narrow, elongate; head protracted beyond the eyes. 
Antenne with third and fourth joints elongate, third very long. 
Feet very slender, long. 
Sp. Hydrometra stagnorum, Cimex stagnorum L., SCHELLENB. Cimic. Tab, Ix. 
fig. 2; Dumér. Cons. gén. s.l. Ins. Pl. 37, fig. 5. This small needle-shaped 
insect has much resemblance to the genus Ploiaria. 
Phalanx III. Nudicollia (Reduviide West.). Sheath of ros- 
trum triarticulate. Rostrum incurved. Head abruptly attenuated 
towards the base, forming a distinct neck. Antenne with four 
joints, sometime annulate or divided into secondary joints. Feet 
long, with tarsi short, triarticulate, with two terminal claws. 
