296 RHYNCHOPHORA. [Tychiina. 
ment to the base of the fourth ; the autenne are cither 10- or 11-jointed 
and are inserted in front of the middle of the rostrum ; the anterior 
cox are contiguous and the prosternum is not emarginate at apex; the 
thorax is constricted before apex and rounded and dilated at the sides ; 
the scutellum is distinct ; the pygidium is exposed, at all events in the 
male; the legs are comparatively short and stout ; the species are small 
squamose insects, which are in many cases very prettily variegated ; they 
are found on low plants; the larve live in the pods or heads of their 
food-plant, and in many cases construct galls; they undergo their 
changes in the earth. 
The three genera may be distinguished as follows : 
I, Elytra subrectangular at apex of suture, jointly 
rounded, and usually covering pygidium, at all events 
in female. 
i. Funiculus of antenne seven-jointed Bibel te fe 1) SE MOMIUS, Gone 
ii. Funiculus of antennz six-jointed . ge ae MICCoTROGUS, Schénh. 
II. Elytra separately rounded at apex, leaving the 
pygidium, at all events in part, exposed ; funiculus of 
antenne consisting of six joints . . . . . . . . SIBINIA, Schonh. 
TYCHIUS, Germar. 
This is a large and important genus containing nearly a hundred 
species from -Europe alone; it is also widely distributed in_ various 
quarters of the world, representatives occurring in Northern and Southern 
Africa, Northern and Central Asia, North and South America, Cuba, &e. ; 
the species are small and for the most part uniformly coloured grey or 
yellowish-grey insects; a certain amount, however, are very prettily banded 
and marked ; they are found entirely upon species of Papilionacee ; the 
larvee develop themselves in a gall in the pods or capsules of their food 
plants, but they undergo their transformations underground; the sexual 
differences are not very striking, but the males may be distinguished from 
the females by having the abdomen depressed at base, the rostrum pro- 
portionately shorter, and their pygidium more projecting; in a few 
instances there are other slight characters in the male, such as a small 
tooth on the internal border of the anterior tibie, &c.; eleven species are 
found in Britain; of these the first two are comparatively large and are 
very pretty and conspicuous insects; the remainder, however, are small 
and, with one or two exceptions, very much alike and hard to distinguish 
without careful comparison ; the last of them, 7. pygmeus, Bris., is 
chiefly known by its minute size ; it is, in fact, one of the smallest of 
all our indigenous Rhynchophora. 
I. Posterior femora with a very strong tooth; elytra 
with the suture white, and with two broad white 
lateral bands, which are interrupted in the middle 
and form four patches” . . + - + + «© « + 
Il. Posterior femora with a much smaller tooth or quite 
simple ; elytra without or with uninterrupted bands 
at sides, 
T. QUINQUEPUNCTATUS, L. 
