Genera Trapezia and T'etralia. 274 
LAMBRUS RHOMBICUS.—Carapax paulo transversus, medium latior, 
subrhombicus, lateraliter posticéque arcuatus, pone oculos non constric- 
tus ; superficie inzquali tuberculis parvulis parce ornat, regione laterali 
super basin pedis secundi tuberculo conico armatà, posterius altero 
minore; rostro apicem pubescente. Pedes antici margines hirsuti, ma- 
nu trigoná, marginibus salientibus inzeque dentatis, brachio marginem 
anticum minuté eroso et superficiem minuté d E Pedes 8 pos- 
tici gracillimi, breviter pubescentes.— Long. 10" | 
Hab. in Archipelago Vitiensi, mari Pacifico. 
" CERATOCARCINUS? sPECIOsUs.—arapax hexagonus, fere equilate- 
ralis, depressus, regionibus partim conspicuis, fronte lato, recté trans- 
verso, subtiliter crenulato, medium emarginato, utrinque juxta oculum 
valde saliente. Manus digitusque mobilis spinulosi ; carpus parce spin- 
ulosus; digiti contigui. Pedes 8 postici breviter pubescentes, inermes. 
—bLong. 14". C 
Hab. in Archipelago Vitiensi, mari Pacifico. 
una P dirait cil Rei 
Ox THE GeNERA TRAPEZIA axo TETRALIA. By J. D. Dax4, 
[Am. Jour. Sci., 2nd Ser., xi, p. 223] 
'Ture genus 'Trapezia, as instituted by Latreille and accepted 
by authors, embraces two distinct genera, which are similar in 
the general form and appearance of the species, but are readily 
distinguished by several characters. 'l'he T'rapezia cymodoce 
is the type of the true ''rapezie, the T* digitalis or glaberrima 
of the other genus. "T'he following are their. characteristics, omit-. 
ting the points in which they agree. 
Genus 'T'RAPEZIA. 
F'rons sinuosus vel 6-8-dentatus. 
Mawillipedes externi marginem postieum fere transversi; apices- 
que articulorum secundorum inter sese valde remoti. 
Superficies prelabialis viaque efferens line& elevatà divise 
margoque buccalis anticus utrinque emarginatus, emarginatione 
vie efferentis ostio. 
Pedes antici elongati, brachio extra carapacem valde exserto, 
margine brachii antico denticulato et apicem anticum acuto, 
manu fere rectá, pollice parce deflexo. 
Pedes 8 postici non unguiculati, tarso apicem pusillé producto 
et truncato. 
Abdomen maris sepius 5-articulatum. 
f: 
