260 PERCY SLADEN TRUST EXPEDITION 



ending in a sharp acuminate process, and with apparently biforian spiracles. This larva 

 has somewhat the facies of an Elaterid larva ; but it is quite uncertain to what beetle it 

 belongs, or why it should be continually found accompanying the Copelatus between the 

 Pandanus leaf-bases. I have thought it best to mention it here, while hoping that a full 

 description of it and of the Copelatus-XsiXvsi may be given in a later part of this work. 

 With regard to the curious habitat of Copelatus pandanorum, it is intei'esting to compare 

 the cases of Oxyomus palmarum and Atcenius lodoicece [supra, pp. 225, 226), and the 

 summary of facts concerning creatures found between bases of leaves of palms and Pandani 

 in my introductory paper (Trans. Linn. Soc. London, ser. 2 (Zool.), Vol. xiv. 1910, 

 pp. 24 — 5). The species was first found in 1905 by Professor Gardiner, and the rest of 

 the material was obtained by myself in 1908 : details are given below. 



Loc. Seychelles. Silhouette : from leaf-bases of two growing trees of Pandanus 

 Hornei in forest above Mare aux Cochons, 22. IX. 1908, 8 ^, 13 $, and two larvae (No. 35 a). 

 Mah^: from leaf-bases of growing Pandanus, near Morne Blanc, X — XI. 1908, 3 ^ and 3 ?, 

 all very darkly-coloured except one (No. 91); also 2 $ and 1 $ collected in 1905 (Gardiner). 

 Praslin : from leaf-bases of Pandanus Hornei in jungle on Cotes d'Or Estate, 30. XL 

 1908, 4^, 3? (No. 342). 



52. Copelatus pulchellus (Klug). 



Agahus pulchellus Klug, Symb. phys., iv. 1834, pi. xxxiii., fig. 7. 



Copelatus ptdchellus Sharp, On Dytiscidae, p. 583; Alluaud, Liste Col^opt., p. 66; 

 Regimbart, Bull. Soc. ent. France, 1900, p. 50; Kolbe, Abh. Senckenb. Ges., xxvi. 1902, 

 p. 574. 



Regimbart has described {I.e.) the Aldabra form of this insect, and the 4 males and 

 4 females before me correspond with his desciiption. It is a small form — the specimens 

 in question being about 5 mm. long — and the female has the thorax and elytra almost 

 entirely covered with a dense sculpture of deep striolse which on the elytra undulate and 

 anastomose. The species is very variable in this respect, some females being entirely 

 destitute of striol*, and some having only the lateral part of each elytron striolate (see 

 Regimbart, Mem. Soc. ent. Belgique, iv. 1895, p. 164). 



Loc. Aldabra : Takaraaka, some at light, X— XII. 1908 (Fryer) : 1895 (Voeltzkow). 

 Madagascar ; E., W., and S. Africa. 



Hydaticus Leach, Zool. Miscell., iii. 1817, p. 69. 



53. Hydaticus leander (Rossi). 



Dytiscus leander Rossi, Faun. Etrusc, i. 1790, p. 202. 



Hydaticus leander Sharp, On Dytiscidse, p. 662 ; Alluaud, Liste Coleopt., p. 68 ; 

 Kolbe, Mitt. Zooh Mus. Berlin, v. 1910, p. 19. 



3 $ from Coetivy. In 2 the thorax is reddish-brown, narrowly darker along the 

 posterior margin : in the third it is much darker, all the middle portion being dark, and 

 the head also is much darker than in the two other specimens. 



Loc. Coetivy, 1905. Seychelles; La Digue, 1892 (Alluaud). Distribution very 

 wide ; S. Europe, Syria, Africa and Cape Verde Islands, Madagascar. 



