376 RHYNCHOPHORA. [Phytobius. 
This species may be distinguished from those that follow by having 
the anterior margin of the thorax almost simple, and the lateral tubercles 
of the thorax somewhat obsolete, and also by having the anterior cox 
separated by a narrow space and almost contiguous. 
P. Waltoni, Boh. (notula, Gyll., nee Germ., nec Thoms.). Short, 
rather convex, black, under surface and a broad streak on each side of 
thorax covered with white scales, elytra variegated with white ; antennze 
and legs red or yellowish-red, femora furnished beneath with a nigro- 
fuscous spot before apex ; thorax rather long, narrowed in front, with- 
out central furrow, and with four moderate tubercles ; elytra with rather 
deep punctured striae, interstices not muricate; rostrum comparatively 
long, a point which, in conjunction with the absence of a channel on 
the thorax, will easily distinguish it from its near allies. L. 2 mm. 
Male with the intermediate tibie armed with a small hook. 
Marshy places; on aquatic plants; very local, but sometimes not uncommon ; 
Esher ; Mickleham ; Woking; Cowley; Barnes Common, formerly in abundance 
(S. Stevens); Windsor; Woodbastwick, Horning (Norfolk); Hastings; in moss, 
canal near Southsea, common in spring (Moncreaff), . 
P. quadrituberculatus, F. (notula, Germ., nec Thoms., nec Gyll.). 
Short, upper surface rather depressed, under surface and sides of thorax 
closely covered with greyish scales, upper surface variegated with the 
same; antenne, except club, ferruginous, legs dark, tibiae ferruginous 
with a fuscous ring before middle ; rostrum short ; thorax rather strongly 
punctured, narrowed in front, with four fovee, a more or less distinct 
central furrow, and four distinct tubercles, two on anterior margin and 
two behind middle; elytra with moderately deep punctured striz, 
interstices convex, the fifth to the eighth set with small rough tubercles, 
especially behind; anterior coxa rather broadly distant ; prosternum 
excavate, with the excavation margined on each side; anterior coxe 
rather broadly distant. L. 2-25 mm. 
Male with the posterior tibize armed with a hook. 
Marshy places; on aquatic plants ; not uncommon; London district, generally 
distributed, Weybridge, Caterham, Shirley, Lee, Faversham, Chatham, Dulwich, West 
Wickham, &c. ; Loughton, Essex ; Deal; Hastings; Southsea; New Forest ; Devon, 
Westward Ho! common on stones near the Pebble ridge in August; Norfolk ; Hert- 
ford; Midland counties, general ; Liverpool; Manchester; Heysham, Lancaster ; 
Northumberland and Durham district; Scotland, local, Solway, Tweed and Forth 
districts ; Ireland, near Dublin, Waterford and Belfast and probably general. 
This species may be distinguished by the rather widely distant 
anterior coxe, the muricate sides of elytra, the distinct tubercles of the 
thorax which is foveate on dise, and the margined excavation of the 
prosternum ; the scales on the upper surface are, as a rule, very scanty. 
P. canaliculatus, Fihr. (notulu, Thoms., nee Germ., nec GylL). 
This species may be known trom P. comari by the more evident tuber- 
cles of the thorax and the dark velvety patch at base of suture; 
