HYDROPHILIDAE. 



33 



Elytra taken together elliptic, not quite twice as long as wide behind the 

 prothorax, dusky in colour, dull yellowish at the sides and behind. Punctura- 

 tion like that of pronotum, of same depth and closeness. On the disc the three 

 irregular rows of larger punctures can easily be seen, and along the outer margin 

 there is even an indication of a fourth row. Sutural stria extending beyond the 

 basal fourth of the length of the elytra. 



Under surface, including femora, dusky, the knees, tibiae and tarsi reddish. 



Mentum shining, with an anterior rounded impression and some well marked 



punctures. Prosternum in the middle without anterior 



tooth. Mesosternum with an elevated, median, slightly 



thickened and posteriorly not very thin lamina, the 



anterior side of which is nearly perpendicular, while the 



lower edge is free from inequalities but provided with a 



very minute acumen at its anterior angle. Middle of 



metasternum before posterior coxae with a very small 



elongate shining space free from pubescence. Fifth 



ventral segment with a small but conspicuous ciliated ^ , , 



^ . . Text- FIG. 1. — Enochrus 



notch at the end. Claws, especially the anterior ones, bryani, aedeagus. 

 hooked in the male. 



Aedeagus (Text-fig. 1) with outer lobes narrowed and curved inwards at 

 the end. 



6. Enochrus (Methydrus) parvulus Kuwert, 1888 {nec Reiche, 1856). 



Twelve specimens. Upolu : Tafua Volcano (H. Swale), 1917 ; Apia 

 (Swezey and Wilder), 13.ix.l923 ; iii.1924 ; v.1924 ; xi.l924; i.l925 ; vii.1925. 



These specimens agree so closely with others from tile Seychelles and 

 Aldabra Is. (H. Scott det.), especially as regards the shape of the mesosternal 

 lamina, that I do not hesitate to consider them as belonging to E. parvulus. 

 E. malabarensis Regimbart is very similar, but in this species the mesosternal 

 lamina is larger and more perpendicular on its anterior side. The type of E. 

 parvulus was obtained at Beirut, and the species has since been met with in 

 Egypt, Troj)ical Africa, the Transvaal, Madagascar, Seychelles, Aldabra, 

 Coetivy I. and India. Knisch's record (Friederichs, I.e., p. 151) of E. esuriens* 



IV. 1 



Erroneously spelt " escuriens" by Kniscli. 



3 



