230 PERCY SLADEN TRUST EXPEDITION 
The specimens before me consist of 18 from Mahé, 4 from Ceylon (named and given 
by Mr George Lewis), and 8 from Perim Island. Many of the Seychelles specimens are 
much larger and darker than the others. Those from Perim are especially small and 
some of them light in colour; but I have seen no characters indicating the presence of 
more than one species. 
Wings: examined in 5 specimens from Mahé, 2 from Ceylon and 2 from Perim ; 
in all these found to be reduced to minute vestiges, scarcely more than 4 the 
length of the elytron. Micrometer measurements of wing- and elytron-lengths have 
been made in 2 Perim specimens, 2 Ceylon specimens, and 2 Seychelles specimens. 
Allowance must be made for error due to crumpling of the wing, &c. ‘The size of the 
organs of course varies with that of the individual. In the Perim specimens the wing is 
0719 mm., the elytron 0°51 mm. long: in a large Seychelles specimen, wing 0°23 mm., 
elytron 0°6 mm. The ratios between wing-length and elytron-length are 9:26 in the 
Perim specimens, 10:27 in the Ceylon and one of the Seychelles specimens, 11:29 in 
the other Seychelles specimen. Relative sizes of wing and elytron are shown in PI. 14, 
fig. 26. 
Reduced wings have also been found in Acritus (diletes) longipes Sharp and its var. 
haleakale Scott and in Acritus (diletes) subalatus Scott, all from the Hawaiian Islands (see 
Fauna Hawaiiensis, iii. pp. 529, 530, and Pl. 15, figs. 25, 26). 
Loc. Seychelles. Mahé: Long Island, from seaweed on beach, VII. 1908, 
8 specimens; Anonyme Island, from seaweed, I. 1909, 10 specimens. La Digue and 
Marie Anne Islands, under seaweed, 1892 (Alluaud). Ceylon. Perim Island, Red Sea 
(J. J. Walker, voyage of H.M.S. “ Penguin”; specimens in British Museum). 
Subgenus AiLerEs, Horn, Proc. Am. Phil. Soc., xii. 18738, p. 356. 
Apart from Acritus (Halacritus) algarum, no member of the genus Acritus was 
previously known from the Seychelles. 3 species of the subgenus //etes have now been 
found there, and are described below. Each is represented by 3 specimens, and all were 
found in the mountain-forests. All 3 species are minute forms, small even for the genus 
Acritus. The complete absence of a visible scutellum is the only character separating 
Afletes from subgenus Acritus s. str. According to Bickhardt’s Catalogue of Histeridz, 
1910, no Aletes is recorded from Madagascar or S. Asia: no member of the whole genus 
Acritus is known from continental Africa: and the only two species known from 
Madagascar (Acritus alluaudi Schmidt and madagascariensis Schmidt, both of which 
I have seen through the kindness of Monsieur Alluaud) belong to the subgenus Acrztus 
s. str. It may be noted that of 33 species of Acritus known from the Hawaiian 
Islands, 82 are dletes and only 1 belongs to Acritus s. str. (see Fauna Hawaiiensis, i. 
p. 514, &c.). 
34. Acritus (Aletes) daubam, sp. nov. (Plate 14, figs. 27, 28). 
Ovalis, convexus, nitidus, ferrugineo-piceus, antennis pedibusque fusco-testaceis ; 
capite rare tenuissime punctulato; prothorace haud dense punctato, ante basin in medio 
