<s THE ENTOMOLOGIST. 



NOTES ON AQUATIC EHYNCHOTA. No. 1. 

 By G. W. Kirkaldy. 



Faill. HyDROMETRIDVE. 



1. Hydrometra greeni, Kirk., n. sp. — Dark fawn colour; eyes black ; 

 length of head from eyes to apex nearly two and a third times greater 

 than from eyes to base, wider between the antenniferous tubercles than 

 at the base. Antennae — first segment thicker apically than basally, 

 not half the length of tbe second, which is not nearly half as long as 

 the third. Hemielytra short, reaching to the base of the fifth abdo- 

 minal segment ; nervures pale violet brown. Femora reddish violet. 

 Abdominis dorsum (except connexivum and genital segments) dark 

 violet brown. Ventral surface pale fawn colour, destitute of silvery 

 pubescence. Length 11-5 mm. Type, ?; my collection. 



Hab. Punduloya, Ceylon (E. Ernest Green, May, 1897). 



Not unlike H. stag riorum, L., differing in the colour and in 

 the proportions of the head and antennae. The apical part of 

 the head (anterior to the eyes) is longer than in the latter species, 

 and the second antennal segment longer in proportion to the 

 first. It is destitute, moreover, of the dense silvery pubescence 

 which, in H. stagnorum, forms such a striking contrast to the 

 prevailing black colouring. 



H. greeni is the first true Hydrometra recorded from Ceylon, 

 or indeed from the Oriental Kegion ; nitida, pectoralis, and 

 discolor referred to this genus by Mayr (Novara Keise, Hem. 

 pp. 170-2) belonging to the genus Gerris. 



2. The following species have apparently been omitted from 

 Lethierry and Severin's ' Catalogue,' vol. iii. : — Page 51. Hydro- 

 metra lineata, Say? 1832, Descr. Het. Hem. iNewHarm.), p. 35 

 (reprinted 1857, Trans. N.Y. Agric. Soc. p. 806, and 1869, Compl. 

 Writ. i. p. 361) = Limnobates lineata, Uhl., 1894, Proc. Cat. 

 Acad. Sci. (2) iv. p. 288. U.S.A. [With regard to Dr. Mon- 

 tandon's remarks (1896, Ann. Ent. Beige xl. 508) as to the 

 correct date of Say's paper, it may be noted that no original 

 copies appear to be extant, and that the date in the 1857 reprint 

 may be an error.] Page 60. Gerris canaliculars, Say, I. c. 

 (reprints, pp. 807 and 363 respectively). Georgia. 



Fam. Gelastocorid.e. 

 It is probable that Nerthra, Say, I. c. (type, N. stygica, Say), 

 should replace Mononyx, Lap., 1832, Mag. Zool. p. 16 ; but on 

 account of the uncertain date of the former work, and the un- 

 satisfactory description of the genus, it will be better, perhaps, 

 to retain the latter name. 



Fam. Belostomatidte. 

 1. Pedinocoris macronyx, Mayr. Prof. Carl F. Baker has 



