Orchestina. | RHYNCHOPHORA. 255 
Two genera are represented in Hurope, both of which are found in 
Britain : they may be distinguished as follows : — 
I. Antennz geniculate, inserted at the sides of the rostrum, 
before the eyes. . ORcHEsSTES, I71. 
II. Antenne straight, inserted at the pase of the “rostrum, 
between the eyes. . . a) Se . . Ruamenus, Clairv. 
ORCHESTES, Illiger (Rhynchenus, Clairville). 
This genus contains about fifty species, of which more than thirty are 
found in Europe; the remainder occur in Northern and Southern Africa, 
the Caucasus district, North America, &c. ; the precise number of British 
species is not quite certain as two or three have their claim to be indi- 
genous based on single specimens, and require further confirmation ; if, 
however, we include O. sparsus, O. decoratus and O lonicere the num- 
ber of species hitherto found in this country is fifteen, which is a very 
good proportion; as a rule they may be known by the thickened 
posterior femora, but this is hardly noticeable in the very small species 
O. saliceti ; the antennz are geniculate and inserted at the sides of the 
rostrum before the eyes, and the anterior cox are contiguous; the head 
is small and the upper surface is almost entirely occupied by the eyes 
which nearly meet, in many cases, on the vertex; the thorax is very 
small in proportion to the elytra and only about half as broad as the 
latter ; the scutellum is distinct ; the elytra are large in proportion to 
the rest of the body and are often very prettily variegated ; the femora, 
besides being almost invariably thickened, are longer than the tibie ; in 
the males the rostrum is duller and proportionately smaller than in the 
females, but this is not very marked except in O. lonicerw, and there 
are also slight differences in the insertion of the antenne and the shape 
of the pygidium and the apex of the last ventral segment of the abdo- 
men, which, however, do not call for any particular notice; they are all 
small or very small insects, ranging from 2 to 35 mm. in length. 
The larve of several species have been observed and noted by various 
writers ; that of O. fagi will be found figured by Westwood (Classifica- 
tion I. p. 336, fig. 41, 19) ; it is rather peculiarly formed, being dilated 
towards the front and tapering towards apex, but possesses no legs ; 
according to Bouché the larva of O. scwtellaris, which mines the leaves 
of birch in May, is furnished, at the extremity of its pointed terminal 
segment, with a brown point, as well as with six short legs, but there is 
probably some mistake, as these characters have not been observed in 
any other allied larve; the habits of A. alni are well known ; 
they mine the parenchyma of leaves of the elm and towards the 
end of autumn these may be seen, in certain localities, covered with 
more or less small raised yellowish or brownish knobs ; the larve will he 
found in these, and when full grown they construct a small cocoon inside 
