Clytltrina.'] riiYTOpnvQA. 285 



in Ivirope; apart from the distinguishing characters above mentioned 

 the head is more prominent than in the Cryptocephalina, and the 

 pyitiilium is covered ; the forehead in the larva also is convex, and the 

 bag-liko covering thin and fragile; the two British genera may be thus 

 distinguished: 



I. Posterior anples of thorax acute and elevated .... LABTDOSTOMIS, Lac. 

 II. Posterior angles of tliornz rounded and not elevated . . CLYTHBA, Laich. 



XiABXDOSTOMXS, 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 Clythra 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 thorax acute and elevated ; the anterior legs, 

 especially in the male, are longer than the intermediate. 



The larvae resemble that of Clythra ; that of C. tridentata is figured by Westwood 

 (Classification, i. p. 383, fig. 47, 11). 



Xi. tridentata, L. Oblong, convex, subparallel, of a cyaneous or 

 greenish-cyaneous, or metallic green colour with the elytra testaceous, 

 immaculate ; head depressed, closely punctured, antennae 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. 6-8^ 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, Ac. ; sometimes found about ants' nests ; rare ; Dnrenth 

 Wood (Lewis) ; Coombe Wood, Worcestershire and Yorkshire (Stephens) ; Bewdley 

 on sallow ( Blutch). 



CXiYTHRA, Laicharting. 



The species belonging to this and the following genus are very easily 

 known by their broad oMong 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 antennae 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 

 tout, with the tibiae thickened towards apex and the tarsi broad, the 



