CURCULIONID.^. — HYDRONOMUS.— GRYPIDIUS. 77 



Genus CCCI.— Hydronomus, Schonherr. 



Antennce geniculated, 12-jointed, stout, rather short; funiculus 7-jointed, its 

 first joint obovate, thick, second elongate, obconic, remainder nodose, consi- 

 derably thickened towards the club, which is large, and short-ovate. Rostrum 

 rather short, somewhat stout, and a little bent : eyes lateral, ovate, depressed; 

 thorax slender, very much emarginated anteriorly, and lobate behind the eyes, 

 truncate behind: scutellum small: elytra oblong, attenuated at the apex, 

 covering the abdomen, the shoulders obtusely angulated: legs elongate, 

 slender, the anterior approximating: femora incrassated in the middle, 

 unarmed : tibia all curved, the interior apex armed with a stout hook. 

 Closely resembling the genus Bagoiis in habit, but readily known 

 therefrom by the absence of the pectoral groove : like the insects 

 of that genus, they frequent damp and marshy places, and float 

 about on the water : from the other allied genera the curvature of 

 the tibia, combined with the attenuated elytra and deeply emar- 

 ginated thorax, sufficiently distinguish it. 



Sp. 1. Alismatis. Niger, squamis cinereo-alhidis variegatus, thorace utrinque 

 impresso, tibiis testaceis. (Long. corp. 2—2^ lin.) 



Cu. Alismatis. Marsham.—Uy. Alismatis. Steph. Catal. 164. No. 1678. 



Black, variegated with cinereous scales : head with a deep impressed groove 

 between the eyes : thorax with an obsolete transverse impression within the 

 apex, the disc with an obsolete dorsal Une, and towards the middle of the 

 margin on each side a faint-impressed fovea : elytra slightly convex, obso- 

 letely punctate-striate, the interstices flat, coriaceous, irregularly clothed with 

 ashy-white scales, the latter forming an oblique conspicuous spot rather 

 beyond the middle of the elytra near the suture : legs obscure testaceous : 

 femora with the apex dusky, tarsi fuscescent. 

 Not very abundant near London : I have taken it in boggy parts 



of Wimbledon-common, and also in the ditches in Battersea-fields. 



" Common on Alisma Plantago (near Swansea)."— L. W. Dill- 



wyn, Esq. 



Genus CCCIL— Grypidius, Schonherr. 



Antennce geniculated, 12-jointed, rather long and slender, the basal joints 

 touching the eyes ; funiculus 7-jointed, its two basal joints rather long, 

 obconic, the remainder short, nodose, equal; club oblong-ovate. Rostrum 

 elongate, slender, curved, cylindric : thorax globose, truncate at the base and 

 apex, its sides equally rounded, and distinctly lobed behind the eyes, which 

 are depressed: scutellum small, oblong: elytra subovate, tuberculate, the 



