Entomological Society. 497 
forwarded by Captain Boyes, the interior of which was found to con- 
tain a mass of dried dung, partially eaten, and a dead larva. 
Mr. A. White exhibited drawings of various remarkable species of 
Crustacea, and read the description of a new genus of Brachyura 
somewhat allied in appearance to Plagusia of Latreille. 
‘‘The two divisions of Plagusia and Grapsus were formed by La- 
treille and Lamarck for the reception of certain Crabs, to which, from 
their square carapace and frequently perpendicular sides, Latreille 
gave the name of Quadrilateres. By De Haan the former of these 
genera has been divided into two, his Philyra depressa being founded 
on the Cancer depressus figured by Herbst, while he retains the name 
of Plagusia for those species of which the Cancer squamosus of Herbst 
(i. 260. t. 20. f. 113) is the type: of this last group he is acquainted 
with four species, two of which he describes. Professor Edwards 
only sectionally divides the genus Plagusia, and describes a new spe- 
cies from the Cape under the name of Pl. tomentosa. A careful 
perusal and comparison of the description given by Linnzus of his 
Cancer Chabrus (M. L. U. Reg. 438) has made me consider the 
Plagusia tomentosa synonymous with the Linnzan species ; in which 
case P. Chabrus must stand in the list for P. tomentosa. Were there 
any just ground for separating the Plagusie depressa and tomentosa, 
the name Philyra, De Haan, ought to be changed, because already 
used for one of the genera of the Leucosiadous family of Crustacea. 
“Without referring to the divisions of the marked group called 
Grapsus, 1 may here exhibit a sketch of a most remarkably formed 
genus from one of the Government voyages, somewhat allied to Pla- 
gusia, but differing much from it in appearance and even in family. 
«“Trtmessus, White. Carapace depressed, somewhat pentagonal, the 
latero-anterior sides being the longest ; the latero-posterior sides 
have two teeth in the middle, the latero-anterior sides have two 
broad dentated teeth between the external angle of orbit and the 
strongly developed, wide dentated division, the end of which forms 
one of the prominent angles of the carapace ; the beak is very wide, 
and is formed of three broad teeth, the lateral forming the internal 
angle of orbit ; the central is the widest, and by three notches at 
the end is divided into four small teeth; the inner antenne are 
small, and not contained within a groove of front ; the outer an- 
tenne are very large, two basal joints thick and strong, and 
project beyond notch of front. The external pedipalps have the 
3rd joint pointed at the end ; it is oblong-ovate. Legs very long, 
compressed ; tarsi longer ihan the joint before them, somewhat 
compressed. 
««Telmessus serratus. Surface covered with small warts arranged in 
some places in lines, with hairs proceeding from the front of them. 
“The specimen is a male.” 
The following papers were also read :— 
‘Description of a new genus of Lamellicorn Beetles apparently 
belonging to the family Aphodiide, from India.” By J. O. West- 
wood, F.L.S. 
Cuztoristurs, Westw. Corpus oblongum, glabrum, dorso valde 
