Dorytomus.| RHYNCHOPHORA. 273 
very distinct and consist in differences in the length of the rostrum 
and anterior legs, the shape of the scrobes, &c.; the species, as a rule, are 
pitchy and fuscous, with the elytra more or less mottled with ferruginous 
scales or pilose pubescence ; in many cases they very closely resemble 
one another and require great care in their determination; in fact it 
will be found in many cases extremely hard to distinguish them without 
a careful comparison of authentic types. 
I have followed M. Bedel in regarding D. costirostris and D. Silber- 
manni as synonymous with D. maculatus, of which species they are 
evidently at most varieties. 
I. Rostrum long and thin, at least as long as half 
the body ; anterior legs of male slender, as long as 
CHE WHOIGWIOOV gd on, sein ae re hat a tee oe eR VORA Rey 
, (longimanus, Forst). 
II. Rostrum shorter and stouter, not as long as half 
the body ; anterior legs of male only slightly elon- 
gate. 
i, Prosternum bordered with a fringe of yellowish 
hairs in front. 
1. Elytra with depressed pubescence and also 
with small raised sete which are plainly 
visible at sides. . . .. =... « . OD. HIRTIPENNIS, Bedel. 
(tentatus, Brit. Cat.) 
2. Elytra with depressed pubescence and without 
raised sete. 
A. Rostrum channelled or with longitudinal 
punctured striz, longer than the head and 
thorax united. 
a. Elytra with well marked variegated 
seale-like pubescence (which more or 
less covers the upper surface), scarcely 
broader at shoulders than base of thorax ; 
anterior tibize distinctly angled in the 
middle of their inner margin in the 
TUG UNS! wai e sites r<i4  shage Redes ey 
b. Elytra almost glabrous, plainly broader 
at shoulders than base of thorax ; anterior 
tibiee almost straight on their inner mar- 
gin in bothsexes . . . . . + - + D.Tortrix, L. 
B. Rostrum even, thickly punctured, and 
pubescent, and scarcely as long as head and 
Ghorax united a es 
ii. Prosternum without a trace of a fringe of 
hairs extending beyond its anterior border. 
1. Anterior margin of prosternum not emar- 
ginate in the middle; elytra with a very 
slight prominence, usually covered with 
whitish hairs, at the apex of the fifth inter- 
D. TREMULA, F. 
D,. VALIDIROS?TRIS, Gyll. 
stice. 
A. Rostrum almost glabrous, longer and 
thinner; form narrower . . . - - D.macuratus, Marsh. 
(teniatus, F. nec Brit. Cat.) 
V. costirostrts, Schénh. 
V. Silbermanni, Wenck. 
VOL. V. : T 
