CEROTRUS. — OH ALvENOSOMA. 



187 



closely but scarcely more strongly punctate. Underside : first 

 segment of the posterior tarsi as long as the three following 

 segments together ; claws appendiculate ; anterior coxal cavities 

 closed behind. 



Length, 3J-5 mm. 



Burma : Bhamo, vii. 1886 {Fed). 



Type in the Genoa Museum. 



It must be pointed out that the difference in the lengths of the 

 second and third segments of the antennae, which ought to be 

 equal in the genus Cerotrus, makes the generic position of this 

 species somewhat doubtful ; but without more material it is not 

 possible to change its position at present. 



Genus CH ALiE NOSOM A, Jacob//. 

 Chalmiosoma, Jac, Trans. Ent. Soc. Lond. 1893, p. 157. 



Genotype, Chalamosoma metallicum, Jacoby. 



Body oblong-ovate, often convex behind. Colour generally 

 metallic green, often with a cupreous sheen. Head : vertex 

 convex, frontal tubercles well developed, separated from the 

 vertex by a deep transverse impression ; eyes strongly convex. 

 Antennae long, generally of uniform thickness throughout ; 

 second and third segments very short, generally equal, fourth 

 segment the longest ; the following segments almost equal. 

 Proihoraoc broader than long, rather convex, posterior margin 

 rounded, surface without basal depressions, the four corners often 

 angulate, each bearing a tine seta. Elytra with a strong post- 

 basal transverse depression, consequently the basal area is convex; 

 broader at the base than the prothorax ; confusedly and closely 

 punctate ; epipieura broad, extending to the apex. Underside: legs 

 long and slender, posterior femora but moderately thickened, 

 all the tibiae unarmed, first segment of the posterior tarsi longer 

 than the two following segments together, claws appendiculate ; 

 prosternum very narrow, the anterior coxal cavities closed behind. 



In some species of this genus the males show secondary sexual 

 characters, having the first segment of the front and middle tarsi 

 enlarged and the antennae, except the three basal segments, some- 

 what thickened. 



Range. South India. 



This genus may be regarded as transitional between Haltioin^; 

 and Galeruoi^yE. 



Key to the Species. 



1. Pronotum with a broad median or ante- 



median transverse depression, which 

 may be more or less pronounced .... 2. 

 Pronotum without any depression 4. 



2. Pronotal transverse depression quite dis- 



tinct ; elytra without transverse purple 

 bands 3. 



