HEM ARGUS. 
298 
1. Cecrops Latreillii, Tab. XXXIV, figs. 1, 2. 
Cecrops Latreillii, Leach , Enc. Brit. Supp., i, t. 20, f. 1-5. 
— LamarcJc , An. s. Vert., edit. 1st, v, 138. 
— Latreille , Erie, meth., t. 335, f. 3-9. 
— Desmarest , Cons, sur les Crust., 338, t. 50, f. 2. 
— Guerin , Icon. Begne An. Crust., t. 35, f. 8. 
— M. Edwards , Hist. Nat. Crust., iii, 474. 
Description. — This animal is about an inch long (the 
female), and is of a pale horny colour. The frontal edge 
of the carapace is deeply notched, as is also, in a less 
degree, the lower margin of the elytraform appendage, 
and the last thoracic segment of the body. The termi- 
nating strong hooks of the foot-jaws are of a deep black 
colour, contrasting strongly with the light horny colour 
of the rest of the body. The male is not above one third 
the size of the female. 
Hab . — On the Orthagoriscus molce , Kinsale, G. J. 
Allman, Esq., August 1848. Dublin coast, It. Ball, Esq., 
W. Thompson, Esq. Selsey Bill, near Bognor, Sussex, 
August 1835-6 (?), G. Newport, Esq., British Museum. 
Weymouth, Professor E. Eorbes, and R. M‘ An drew, Esq. 
In all these instances they were taken from the sun-fish, 
and adhering to the gills. 
Gems 2 — Ljem argus. 
LyEMARGUS, Kroyer, i, 500. 
— M. Edwards , Hist. Nat. Crust, iii, 474. 
Character. — Elytraform appendage of considerable size. 
The feet are foliaceous and branchial. The upper seg- 
ments of the thorax are distinct and small. 
Bibliographical History. — Kroyer established the genus 
in his c Tidsskrift, 5 in 1838. Finding all the feet folia- 
ceous and branchial, he considered it a sufficient character 
to separate the species from Cecrops, to which it is so 
nearly allied, and form it into a distinct genus. M. 
