256 PERCY SLA DEN TRUST EXPEDITION 



slightly inwards, and are continued on to the elytra as grooves of about the same length 

 as the thoracic portion. Sutural stria deep, reaching the apex, but not quite to the base. 

 Surface finely reticulate. Each elytron (PI. 12, fig. 15) is almost black with the following 

 yellow markings : (i) the lateral margin, broadly dilated in its front part, slightly dilated 

 behind the middle (this second dilation being sometimes rather vaguely cut off from the 

 rest of the margin by a dark line), and triangularly dilated at the apex : and (ii) two 

 longitudinal vittse on the front part of the disc, not reaching the base and ending a little 

 in front of the middle, quite separated from the lateral margin by an intervening dark 

 area, but in one specimen confluent with each other at one point. 



This species could not be identified with any in the British Museum collections, nor 

 does it appear to agree entirely with any of Regimbart's descriptions. The colour-pattern 

 of the elytra is of a similar type to that found in several other species, though the colours 

 themselves may be different. This pattern is of the same type as that of B. geminodes 

 R^g., though that species is extremely different in form, colour, and punctuation : judging 

 from the description it is also similar to that of the W. African B. africanus R%. (Mem. 

 Soc. ent. Belgique, iv. 1895, p. 90), but here again the colour itself of the elytra is described 

 as "d'un brun nebuleux," the species is smaller, and there are probably many other 

 differences. In another case the figure and description (in Ann. Soc. ent. France, Ixviii. 

 1899, p. 224) of a species from the Philippines, B. 2^seudogeminus Reg., show that the 

 pattern is the same ; here too, according to the description, the colours themselves appear 

 to be fairly similar to those of B. farquharensis, but the form of the insect is described as 

 " oblongue, subparallele." All things considered I have felt it necessary to name and 

 describe this species, while recognising that, were it possible to see specimens of all 

 described species, it might prove to be a form of some one of them. 



Loc. Farquhar Atoll : 5 specimens, 1905. 



II. Species with uo sutural stria. 



47. Bidessus peringueyi, R^gimbart. 



Bidessus peringueyi Regimbart, Mem. Soc. ent. Belgique, iv. 1895, p. 84 : Ann. Soc. 

 ent. France, Ixxv. 1906, p. 244. 



Bidessus sechellensis Regimbart, Bull. Soc. ent. France, 1897, p. 208 ; AUuaud, Liste 

 Coleopt., p. 60. 



B. sechellensis was described as a distinct species, but Regimbart afterwards (1906) 

 found it to be the same as B. peringueyi. I have examined specimens of B. peringueyi 

 named by Regimbart in the British Museum : it is a very small species belonging to the 

 group with no sutural stria, and was not obtained by the Percy Sladen Trust Expeditions. 



Loc. Seychelles: La Digue, 1892 (Alluaud). Madagascar, E. and S. Africa. 



48. Bidessus sp. 



A single specimen of a very small species. It is quite distinct from B. peringueyi 

 Regimbart, being strongly punctured on the elytra. It does not appear to agree with 

 any species in Dr Sharp's collection or elsewhere in the British Museum, but I am 



