Doryiomus. | RHYNCHOPHORA. 277 
mature ; the thorax also is variable in colour, being pitchy black or red- 
dish or reddish with dark markings; upper surface slightly shiny, with 
ashy pubescence, elytra variegated ; rostrum moderately stout, longer 
than thorax, carinate in middle and striated on each side, but less dull 
and rugose than in D, validirostris ; antenne ferruginous with the club 
often darker ; thorax transverse, rather strongly constricted in front, 
with the sides dilated and rounded, not very strongly but rather closely 
and very distinctly punctured, with an indistinct central line, which is 
more or less plain in front ; elytra with rather strong punctured strie, 
interstices finely punctured, apex of fifth interstice with a small white 
patch ; legs ferruginous, femora toothed. L. 33-43 mm. 
Male with the antennz inserted nearer the apex of rostrum than in 
the female. 
On willows and sallows ; common and generally distributed throughout the kingdom. 
V. costirostris, Gyll. (bitubereulatus, Zett.). This variety has by 
many authors been considered to be a separate species, but it can hardly 
be regarded as distinct : it is larger, on an average, than the type form, 
and has the sides of the thorax gradually dilated from apex to middle 
and broadest in middle, whereas in the type form it is rather suddenly 
dilated behind apex and broadest before middle ; this character is, how- 
ever, often hard to perceive ; the teeth of the femora are, apparently, a 
little stronger ; Walton, who first introduced D. costirostris as British, 
says that it is very hard to distinguish the species from D. maculatus, 
except by the size and the fact that the latter species appears earlier in the 
spring and is constantly found on a different food plant, the grey sallow 
(Salix cinerea), whereas D. costérostris is found on the aspen (Populus 
tremula) ; I believe, however, that D. maculatus is found at almost any 
time, and the differences of the food plant certainly cannot be relied 
upon, and I therefore prefer to follow Bedelin keeping them together. 
L. 4-5 mm. 
On young aspens and sallows; not common; Esher; Darenth and Swanscombe 
Woods ; Kent; Windsor Forest ; Rusper; Southsea ; Glanyilles Wootton ; Coleshill, 
near Birmingham; Bagley Wood, Oxou; Marple; Agecroft, near Manchester ; 
Northumberland and Durham district, Gosforth Woods, very rare; Walton states 
that he has ‘‘ received many specimens of D. costirostris trom the Rev. W. Little, 
taken in Scotland, but not accoa-panied with any of D. maculatus; also from Mr. 
R. N. Greville, who found them rather abundantly on the Lombardy poplar near 
Edinburgh.”? Dr. Sharp does not mention D. costirostris as Scotch, and it is possible 
that the records must be referred to the var. Silbermanni. 
V. Silbermanni, Wenck. This variety differs from the type form 
in its larger size, less closely punctured thorax, and more strongly 
toothed femora, and from the var. costirostris in its average larger size, 
wider shape, thicker and shorter rostrum, and the uniform spots on its 
elytra. L. 5 mm. 
On willows and aspens; often under bark in winter; not uncommon; Sheerness, 
Darenth Wood, Caterham, Dulwich, Forest Hill, &c.; Mr. Crotch remarks that it 
seems to be abundant with us in early spring, soit is most likely generally distri- 
