258 PERCY SLADEN TRUST EXPEDITION 



a narrow yellowish-testaceous vitta across the base of the elytra, including the scutellum 

 and scarcely interrupted at the suture, narrowing at its outward extremities and not 

 reaching quite to the shoulders, and with a subapical testaceous mark on each elytron ; body 

 beneath dark reddish-pitchy, antennae and legs testaceous, the posterior legs darker. Head 

 with two punctate impressions on either side near the eye. Thorax with a group of fine 

 punctures or punctiform striolse on either side near the base, this sculpture varying but never 

 very strongly developed : the thorax is also slightly impressed on either side in the region of 

 this sculpture. Elytra with no strise, but with 2 distinct though interrupted series of 

 punctures, consisting of little lines of fine punctures with gaps between them : between these 

 two series and between the outer one and the side-margin respectively, are two other much 

 less distinct series, more interrupted and often hard to see, the inner one consisting often 

 of isolated punctures separated by rather long intervals. In the posterior part of the elytron 

 there is a submarginal series of punctures bearing fine pale hairs ; in some specimens the 

 punqtures of the discal series also bear some similar hairs, as also do the punctures of the 

 transverse row which (as in various other species of the genus) runs across the prothorax 

 just behind its front margin : but in most specimens these hairs are absent, being probably 

 worn away. The posterior coxse and anterior abdominal segments are striolate laterally. 

 In the $ the terminal joints of front and middle tarsi are slightly longer than in the $ : 

 other $ characters are given in the diagnosis. 



This species belongs to Group I. of the genus, having no striae on the elytra. 

 Judging from the descriptions it seems to be allied to the Madagascar species C. regim- 

 harti and C. apicalis, Fairmaire (Ann. Soc. ent. Belgique, xlii. 1898, p. 464), but is 

 evidently distinct : C. regimharti has a transverse basal vitta and a subapical mark on 

 each elytron, but is much larger and is described as " fuscus" instead of black : C. apicalis 

 is about the same length as C. gardineri, but has only a minute humeral mark instead of 

 a transverse basal vitta, and differs too in other respects. Having seen no specimens 

 I cannot be sure whether either of these species is really close to C. gardineri or not. 

 C. gardineri is not very close to any species which I have seen in Dr Sharp's or other 

 collections in the British Museum. 



35 specimens. It is the only water-beetle which I ever found in any numbers in the 

 mountain-streams of Seychelles. As far as my experience goes it is found not so much in 

 the swiftly-running parts of the streams (which have prawns and crabs in them), as in 

 more stagnant parts where the streams spread out on more level ground, such as the 

 Silhouette Mare aux Cochons, into pools and small swamps. It was found in such places 

 at elevations up to 1000 feet or over. I have dedicated it to Professor J. Stanley 

 Gardiner, by whom it was first found in 1905. 



Loc. Seychelles. Praslin : 1905, 5 specimens. Silhouette: Mare aux Cochons 

 plateau, VIII — IX. 1908, 16 specimens. Mah^ : from a swampy hollow near Morne 

 Blanc, X. 1908, 14 specimens. 



51. Copelatus pandanorum, sp. nov. (PI. 12, fig. 16). 



$^. Oblongo-ovalis, depressus, ferrugineus vel interdum piceus : capite pronoto- 

 que persubtilissime punctulatis, hoc utrinque ad basin plus minusve striolato : elytris 



