392 Prof. F. M‘Coy on the Classification of 
(R. acris, flore pleno albo), and of the lesser spearwort (R. 
Flammula). Found by Mr. E. Doubleday in the leaves of the 
hart’s-tongue (Scolopendrium vulgare). Ent. Mag. iii. 414, 
415. 
2. Ph. albiceps, Meig. vi. 194. Larva subcutaneous in the leaves 
of the cow-parsnep (Heracleum Sphondylium), and the field- 
thistle (Cnicus arvensis). Pupa-case black. 
3. Ph. Aquilegieg, Hardy MSS. Nigricans; hypostomate sor- 
dide subflavo, proboscide alba; fronte flava; antennis pal- 
pisque nigris ; thorace brevi, subrotundato, convexo, nigro- 
grisescente, subnitido, lineis dorsalibus longitudinalibus dua- 
bus obscuris egre distinguendis, adumbrato; scutello conco- 
lore; abdomine griseo-nigricante, nitido, meisuris interdum 
stricte albescentibus ; vitta laterali parva alba; ventre nigro ; 
pedibus nigris, genubus perobscurius pallidis ; halteribus albis ; 
alis hyalinis, ad bases exalbidis, nervo transverso singulo. 
Long. corp. prope lin. 1. 
The larva forms blotches in the leaves of the common colum- 
bine (Aquilegia vulgaris). It is closely allied to Ph. albiceps, but 
is darker, with the thorax shorter and rounder, and the white 
dashes before the wings not developed. The pupa-case is brown. 
To these may be added others whose changes are still incom- 
plete, found within the leaves of the bean (Vcia Faba), the bur- 
dock (Arctium Lappa), the field-thistle (Cnicus arvensis), the wild 
angelica (Angelica sylvestris), the red clover (Trifolium pratense), 
the red hemp nettle (Galeopsis Tetrahit), the climbing buckwheat 
(Polygonum Convolvulus), the quicken (Triticum repens), the mea- 
dow-sweet (Spiraea Ulnaria), and the kidney-vetch (Anthyllis vul- 
neraria). 
Penmanshiel, by Cockburnspath, Oct. 13, 1849. 
XLI.—On the Classification of some British Fossil Crustacea, 
with Notices of new Forms in the University Collection at Cam- 
bridge. By Frepericx M‘Coy, Professor of Geology and 
Mineralogy in Queen’s College, Belfast. 
[Continued from p. 335. ] 
Ord. EprioPHTHALMA. 
(Trib. Zsopoda.) 
Archeoniscus Brodiet (M. Edw.). 
As this interesting Wealden Crustacean (first I believe taken for 
an oolitic Trilobite) has not yet been fully described, the follow- 
ing notice may be acceptable :— 
