2 [January, 



too, is very sharply defined, and confined to the fourth and fifth seg- 

 ments and the basal half of the sixth, whereas in P. halticus the hind 

 body is nigro-piceous, with the base and apex indeterminately testaceous. 



P. halticus is not uncommon in various places along the south 

 coast (Southsea, Hayling, Sandown, Ventnor, AVeymouth, "Whitsand 

 Bay, &c.), and occurs also on the coasts of Northumberland, Scotland, 

 and Ireland (Co. Meath), as well as on the east and west coasts of 

 England. P. nigriventris appears to be very rare with us, as I have 

 only seen it from the Chesil Beach, whence Mr. J. J. Walker sent me 

 a few specimens in 1886, these agreeing precisely with Dr. Kraatz's 

 definition. Mr. Fowler's examples from Mablethorpe probably belong 

 to it. 



P. spinifer and P. bnlflcus (which were at one time supposed to 

 be sexes of the same insect) frequently occur in com])any, and Mr. 

 Walker has taken specimens of all three species in one day at 

 Weymouth. 



Horsell, Woking : 



December 9th, 1898. 



CORIXA SAUNBERSI, A NEW SPECIES of AQUATIC RHYNCROTA 

 FROM ENGLAND. 



BY G. W. KIRKALDY, F. E. S. 



During the last few weeks Mr. Edward Saunders has very kindly 

 lent me various specimens which I wished to examine in view of my 

 forthcoming memoir upon the British Corixidce. Amongst these was 

 a male from Chobham (whicU Mr. Saunders had considered some 

 years ago to be probably distinct), which w^e thought might belong to 

 the same speCies as two rather doubtful males in the Perth Museum, 

 collected some years ago by Dr. F. B. White in Glen Tilt. After a 

 very careful examination of these and a number of indubitable ex- 

 amples of various species, I had no hesitation in determining the two 

 specimens from Glen Tilt to be varieties of G. nigrolineata, Fieb. 

 (= Fabricii, Fieb.), and the Chobham male to be an undescribed 

 species allied to, but very distinct from, C. fossarum, Leach, and O. 

 nigrolineata, Fieb. Since then Mr. Saunders has communicated two 

 more males and one female, and as my memoir will be concerned only, 

 as regards descriptions at least, with sccondaiy sexual characters, I 

 now describe the new species. Jn naming it C. Saundersi, I am glad 



