Naucoride. 325 
NAUCORIS, Geof’. 
Broad oblong oval, head and eyes buried in the pro- 
notum so that the sides of the pronotum, eyes and front of 
the head form a continuous curve. Head very wide, twice 
as wide as long; rostrum short, three-jointed, almost 
triangular ; pronotum with the base only slightly wider 
than the anterior margin; elytra nearly covering the apex 
of the abdomen in our species; connexivum clothed at the 
sides with long hairs, with the posterior angles of the 
segments produced; anterior femora very much dilated, 
tibiee curved, the single-jointed, simple, clawless tarsi ap- 
pearing as a continuation of the tibiz, tarsi of second and 
third pairs of legs two-jointed, the posterior ones clothed 
with long natatorial hairs, There are three Palearctic 
species, of which we have only one. 
N. cimicoides, Zinn.—Shining, slightly convex, 
ochreous; head and pronotum highly polished, the former 
with an impressed row of punctures near each eye, and a 
darker brown mark down the centre; the latter with a 
row of punctures parallel to the base, and a few other 
scattered ones at the sides and on the disc, a subquadrate 
spot on each side of the dise irrorated with brown; 
scutellum brown, paler at the basal angles; elytra dull, 
exceedingly closely and finely punctured, greyish brown ; 
connexivum ochreous, apices of the segments darker ; legs 
ochreous. 
L. 12-16 mm. 
In ponds not rare, and apparently widely distributed. 
APHELOCHIRUS, Westw. 
This very distinct genus, of only one species, may be 
known at once by its very depressed and short oval form, 
its narrow head, and parallel-sided sublongitudinal eyes, 
its long narrow rostrum, the form of its pronotum, whose 
