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PACIIYCHELES PANAMENSIS. 



71 



PACHYCHELES S 



TIM PS, 



Proc. Acad. Nat. Sci. Plula., X. 228, 1858. 



Pachycheles panamensis Fax„ 



Flate Xr., Fig. ^, ^\ 



Bull. Mus. Comp. Zo51., XXIV. 175, 1893. 



Carapace subcircular, the longitudinal and transverse diameters nearly 

 equal; upper surface flattened^ granulate and setose^ especially on the gastric 

 and anterior portion of the branchial regions, posterior portions of the 

 branchial regions lightly rugose. Front broad, produced to a rounded 

 median lobe, lateral portions straight, inner orbital angle rounded, not pro- 

 duced ; outer orbital angle projecting as a triangular tooth between the ejo 

 and the base of the antenna. Lateral border of the carapace with a con- 

 cavity behind the antenna ; the margin is slightly raised as a rim wliich is 

 lost in one of the branchial ruga3 before reaching the hind border of the cara- 

 pace j hind border slightly concave. Chelipeds micqual, the right being 

 the larger ; upper surface of the merus rugose and setose, under surface 

 smooth, internal distal angle produced as a denticulated tooth ; carpus short 

 and broad, upper surface tuberculous and setose, internal border armed with 

 a large tooth at the base, followed by one or two smaller teeth, lower surface 

 smooth and naked ; upper surflice of the propodite furnished with small 

 tubercles which bear stiff bristles, inner margin rounded, not toothed, outer 

 margin granulated, lower suface convex, naked and polished near the centre 

 (where the surface is reticulated in the larger claw), squamoso-grauular and 

 setose near the edges ; fingers gaping, crossing at tips, toothless on both the 

 inner and outer margins (or at most slightly denticulated on the. outer mar- 

 gin). Ambulatory appendages setose. 



Length of carapace, 6.5 mm., breadth, 7 mm.; breadth of frontal margin, 

 2 mm. 



Panama, Marcli 12. 1 fem. ovig. 

 hchjchdes rudis Stimps. is a larger species, with the posterior margin of 

 the carapace more concave (the concavity having almost the shape of a trian- 

 gular notch) ; the carapace and chelipeds are less setose than in P.pammmsis, 

 the anterior margin of the carpus not prominently toothed, and there is a 

 strong protuberance near the middle of the upper surface of the propodite. 

 In F. McrcuUpcs Lockington the central part of the front is triangular and 



Pi 



