CEUSTACEA. 49 



venture very far from their habitations. The clicking noise produced by snapping the 

 claws of their larger fore-leg together, when made by many hundreds at a time, may be 

 heard at some considerable distance. On the least alarm they retreat precipitately to then 

 burrows. 



1. GELASIMUS, Latreille. 



1. GELASIMUS CULTRIMANUS, Adams 8? White. 



Thorace lsevi ; marginibus lateralilras rotundatis, sine carina acuta, ab angulo canthi externo. 



Fronte, inter oculos, lobo parvo rotundato, dilatato ; margine canthi inferiore distincte crenrJato ; 

 chela majore digitis latis, finibus extrorsum curvatis ; digito inferiore in medio profunde sinuato, lobo lato, 

 prope extremitatem margine serrato-crenulato ; digito superiore margine inferiore fere recto. 



Hab. Insulas Philippinas. 



Carapace with the upper surface smooth ; the lateral edges rounded, without any sharp 

 keel from the outer orbital angle. 



Front, between the eyes, with a small dilated rounded lobe ; edge of lower orbit very 

 distinctly crenated ; fifth joint of fore-legs with the claws wide, both slightly curved outwards 

 at the ends ; the lower claw with a very wide sinus in the middle, a wide serrato-crenated 

 lobe on the edge near the end ; upper claw with the lower edge very nearly straight. 



Hab. Philippine Islands. 



2. GELASIMUS CEASSIPES, Adams §■ White. 



Thorace valde arcuato, postice subito coarctato. 



Fronte lobo sine pedunculo angusto. 



Pedibus posterioribus crassioribus et robustioribus quam in speciebus aliis. 



Hab. Insulas Philippinas. 



Carapace very much arched, suddenly narrowed behind. 



Front with a lobe, without narrow stalk. 



Four hind pairs of legs thicker and stronger than in the other species. 



Hab. Philippine Islands. 



3. GELASIMUS BELLATOR, Adams fy White. 



Thorace antice (prope insertionem canthorum pedunculorum) sinuato. 



Fronte in lobum rotundatum subdilatata ; chelis manu digitis perlongis ; digito superiore lateribus 

 subparalleris, margine prope ad basin tuberculis duobus vel tribus ; digito inferiore infra marginato, acie 

 ad basin sinus superficiali tuberculari, dente robusto lato ad extremitatem. 



Hab. Insulas Philippinas. 



Carapace, in front, just behind the insertion of eye-peduncles, sinuated. 

 Front slightly dilated into a rounded lobe ; fifth joint of the larger fore-leg, with the claws 

 very long ; the upper, or movable claw, with the sides nearly parallel, two or three larger 



o 



