BRITISH STALK-EYED CRUSTACEA. : 413 
Argynnis chariclea and Tipula oleracea; stomachs examined 
sometimes contained over a dozen caterpillars” (H. C. Hart). 
Buack TEern.—Very useful ; destroys quantities of craneflies, 
Tipule (Harting). 
Guaucous Guiu.—Probably often depends upon Lemmings 
for food (H. C. Hart). 
Burron’s Sxua.—Discovery Bay, June, 1876. ‘ As far as my 
actual observations went, these Skuas subsist entirely upon Lem- 
mings, numerous specimens which I dissected containing remains 
of this animal alone: they seem, however, in all cases, to reject 
the entrails” (H. C. Hart). The Buffon’s Skuas examined by 
Mr. Seebohm at the mouth of the Petchora River had been feeding 
on beetles (Seebohm, ‘ Siberia in Europe’). 
The young of small birds are fed, almost exclusively, on insects 
injurious to man (M. Florent Prevost). 
NOTES AND OBSERVATIONS ON BRITISH 
STALK-EYED CRUSTACEA 
By Jonn T. Carrineton, F.L.S8., anp Epwarp Lover. 
(Continued from p. 364.) 
Genus Hyas, Leach. 
This genus somewhat resembles the genus Pisa in its general 
features, though its specific characteristics and minor details 
stamp it at once as quite distinct; like Pisa, too, this genus 
consists of two species hitherto known to Britain. The genus 
Hyas is another of the large group of Crustacea popularly called 
*‘spider crabs.” The carapace is roughly triangular, with the 
lower angles rounded and the anterior angles cleft to form a 
rostrum ; there is a notch for each orbit into which the eyes are 
capable of being turned back. The antenne are short, the 
peduncle very slightly hairy. The legs are long, nearly cylindrical, 
and tapering, the anterior pair being developed into broad forceps, 
the second joint being slightly tuberculated. The legs are armed 
with a sharp claw, but are not adapted, like those of Pisa, for 
clenching a hold on Alge. The abdominal somites are seven in 
number in each sex, those of the male being wider at the third 
and sixth somite, whilst those of the female are broad and pear- 
