PACliYDISSUS. 



133 



joint with a narrow cicatrix at the apex limited by a short trans- 

 verse carina. Elytra truncate at the apex. Femora finely 

 carinate along each side close to the ventral border. Intercoxal 

 process of the prosternum subtruncate posteriorly. 



132. Diorthns simplex, White (Hammaticherus), Cat. Col. B. M., 



Longic. p. 130 (1853). 

 Cerambyx holosericeus, Oliv. (nee Fab.) Ent. iv, no. 67, p. 14, pi. 17, 



fig. 127 (1795). 



Cerambyx vernicosus, Pascoe, Trans. Ent. Soc. (2) v, p. 19 (1859). 

 Pachydissus inclernens, Thorns. Syst. Ceramb. p. 576 (1865). 

 Neocerambyx sordidus, Pascoe, trans. Ent. Soc. 1888, p. 491. 



Varies in colour from black to reddish brown, not very 

 densely covered with short pubescence of a 

 greyish or brownish-grey tint. Head with 

 a median impressed line or groove above, 

 between the eyes. Antennae not quite so- 

 long as the body in the $ , and from one and 

 a half times to nearly twice as long as the body 

 in the <S , fringed with short delicate grey 

 hairs beneath ; third and fourth joints nodose 

 at the apex, the third much longer than the 

 fourth ; fifth to tenth compressed and angu- 

 lated anteriorly at the apex. Prothorax 

 rounded at the sides, somewhat constricted 

 in front, irregularly and not very strongly 

 wrinkled above in a general transverse 

 direction, marked on the disc with some 

 feeble longitudinal and oblique grooves 

 which together form a somewhat crown- 

 shaped impression. Elytra truncate at the 

 apex, with a short spine from each at the 

 sutural angle ; the pubescence covering them 

 more or less glossy, and generally somewhat thinner on each side 

 in front of the middle so that the colour of the underlying derm- 

 becomes more apparent there. 



Length 16-29 ; breadth 4|-8 mm. 



Hub. Baluchistan : Ormarah ( W. D. Gumming) ; Karachi (F. W. 

 Townsend) ; Bengal ; Madras ; Ceylon ; North Burma ; Siam ; Java ;. 

 Aden ; Mauritius ; West Africa. 



Fig. 51. 



Diorthus simplex, 

 White, rf. X f. 



Genus PACHYDISSUS. 



Pachydissus, Newman, Entom. Mag. v, p. 494 (1838) ; Lacord. Gen 

 Coleopt. viii, p. 265 (1869). 



Type, P. serious, Newm., an Australian species. 



Range. This genus, as now restricted, is almost confined to the 

 Australian Eegion ; one or two species belong to the Oriental and 

 a few also to the African Eegion. 



Head with a more or less distinct groove above between the 

 eyes ; the antennal supports narrowly separated ; the front sub- 



