224 PERCY SLADEN TRUST EXPEDITION 
Local distribution within the Seychelles group. As far as my own experience 
goes, 8 out of the 9 species known only from these islands were found in the endemic 
mountain-forests, but several of these were found also in lower, cultivated places: it 
is noteworthy that one of them (Bacanius ambiguus), which I found under the bark 
of decaying wood in several islands, both in the forests and in cultivated places, was 
originally found by Alluaud under seaweed on a sandy beach, in company with the 
seaweed-species Acritus algarum. The remaining peculiar species (Paromalus gar- 
dinert) was only found on a cultivated islet (Long Island). On the other hand, of 
the non-peculiar species, Acritus algarum is a coast species inhabiting seaweed, and 
the wide-spread Saprinus apricarivus was obtained in an outlying coral-island (Bird 
Island) which possesses none of the endemic vegetation or other special characteristics 
of the Seychelles. The species known from the Hawaiian Islands was found on Cascade 
Estate, but only two specimens were collected, and I have no record of the exact spot, 
whether forest or otherwise. The other 3 non-peculiar species were not collected by 
this Expedition. The material is in some cases too small to judge of the local 
distribution: but I think there is some indication of a division between endemic 
forms inhabiting the endemic mountain-forests, and non-endemic forms inhabiting 
cultivated places and the coasts (cf. vol. xv. of these Transactions, 1912, bottom of 
Os SIL} eyevel jo, Mil'9))) 
Reduction of wings. A remarkable case of reduction of these organs to minute 
vestiges has been discovered in Acritus (Halacritus) algarum: details are given on 
p- 230. As mentioned there, reduced wings had been found in two Hawaiian species 
of Acritus, but species belonging to a different subgenus, iletes: lack of material 
prevented my examining the wings in the di/etes from the Seychelles. In Bacanis 
ambiguus and imopinatus I found the wings fully developed. They were not examined 
in any of the other genera or species. 
Puatrysoma, Leach. 
Subgenus PLATYSOMA, s. str. 
24. Platysoma tenuimargo, Schmidt. 
Platysoma tenuimargo Schmidt, Bull. Soc. ent. France, 1893, p. 100; Alluaud, Liste 
Coléopt., p. 108 ; Kolbe, Mitt. Zool. Mus. Berlin, v. 1910, p. 21. 
I am indebted to Mr George Lewis for the determination of this species. It is 
stated by Schmidt to be closely allied to P. conditum Marseul, from New Guinea. The 
collection contains 12 specimens. 
Loc. Seychelles. Silhouette: forest near Mont Pot-d-eau, ca. 1500 feet, VIII. 
1908; forest above Mare aux Cochons, over 1000 feet, IX. 1908 (one specimen recorded 
as found in the decayed head of a felled Verschaffeltia palm); low coconut-planted 
country near coast at Pointe Etienne, IX. 1908. Mahé: Cascade Estate, over 800 feet. 
La Digue: 1892 (Alluaud). 
