Clythrina.] PHYTOPHAGA, 285 
in Europe; apart from the distinguishing characters above mentioned 
the head is more prominent than in the Cryptocephalina, and the 
pygidium is covered; the forehead in the larva also is convex, and the 
bag-like covering thin and fragile; the two British genera may be thus 
distinguished :— 
I. Posterior angles of thorax acute and elevated . . . . Lapstpostomrs, Lac. 
II. Posterior angles of thorax rounded and not elevated . . CuxiyTHra, Laich. 
LABIDOSTOMIES, Lacordaire. 
This genus contains nearly fifty species, which appear to be confined 
to Furope, North Africa, and Northern and Central Asia; there are 
twenty-eight European species, of which one is found in Britain ; it has 
been hitherto united with Cly¢hra in our catalogues, to which genus it 
is certainly closely allied, but it differs in having the clypeus bidentate 
or tridentate, the mandibles, especially of the male, large, and the 
posterior angles of the thcrax acute and elevated; the anterior legs, 
especially in the male, are longer than the intermediate. 
The larve resemble that of Clythra ; that of C. tridentata is figured by Westwood 
(Classification, i. p. 383, fig. 47, 11). 
L. tridentata, L. Oblong, convex, subparallel, of a cyaneous or 
greenish-cyaneous, or metallic green colour with the elytra testaceous, 
immaculate ; head depressed, closely punctured, antennz rather short, 
dark-metallic with base reddish ; thorax transverse, broadest at base, 
where it is about as broad as elytra, closely and strongly punctured ; 
scutellum large; elytra thickly and rather strongly punctured, with 
traces of raised lines ; legs moderate, the anterior pair being evidently 
the longest. L. 6-85 mm. 
Male with the clypeus tridentate, the mandibles slightly exserted, and 
the thorax transversely impressed before apex. 
Female larger and stouter than the male, with the clypeus emarginate, 
and the fifth ventral segment of abdomen broadly impressed with a 
round fovea. 
On sallows, birches, oaks, &c.; sometimes found about ants’ nests; rare; Darenth 
Wood (Lewis) ; Coombe Wood, Worcestershire and Yorkshire (Stephens) ; Bewdley 
on sallow (Blatch). 
CLYTHRA, Laicharting. 
The species belonging to this and the following genus are very easily 
known by their broad oblong and parallel form and short thorax, which 
is as broad at base as the elytra, and is strongly produced in the middle 
of base; the clypeus has the anterior angles slightly acute, and the 
mandibles are very short; the antenne are serrate from the fourth or 
fifth joint ; the eyes are very large, oblong; the posterior angles of the 
thorax are rounded ; the scutellum is large and triangular; the legs are 
stout, with the tibie thickened towards apex and the tarsi broad, the 
