1895. 



PROCEEDINGS OF THE NATIONAL MUSEUM^ 379 



The sixth segment of the abdomen in the male is shorter than the 

 seventh ; the seventh is very broad and obtuse. The appendages of tlie 

 first segment (Plate XXX, figs. 3 and 4) are very different from those 

 of any other species that I have seen. The character of the chelipeds 

 is shown in Plate XXX, figs. 1 and 2. The carpus, propodus and 

 dactylus are granulate. The ambulatory legs are spiuulous above; 

 the propodal joints are spinulous below. 



Dimensions.— LQngi\^ of male, 18.7 mm. ; width, 30.8 mm. Length of 

 female, 18 mm.; width, 29.9 mm. 



(7o/or.— Very dark brown; lower side and legs lighter. 



Jlrtftifrtt— "LaMina,"Eio Torres, north of San Jose, 1,130 meters 

 above the sea. One male (No. 19047, U.S.N.M.) and one female, col- 

 lected by J. Fid. Tristan, August 7, 1894. 



EXPLANATION OF PLATES. 

 Plate XXIX. 

 PseudotheJphusa 7nagna, male. Less than one-half uatiiral size. 



Plate XXX. 



Fig. 1. Pseudothelphusatrisfani,male. Natural size. 



2. Pseiidothel2)hH8a tristarii, male, large hand. Slightly enlarged. 



3. Psendothclphiisa instanl, male, right abdominal appendages, outer side. 



Three and one-half times natural size. 



4. PseudotMphusa tristani, male, left abdominal appendages, lower side. Four 



times natural size. 



5. Psetidothelphusa tristani, front. About two and one-half times natural size. 



6. Psetidothelphusa rkhmondi, front. About two and two-thirds natural size. 



7. Psetidothelphusa ma<j)ia, front. About one and one third natural size. 



8. Psetidothelphtisa magtia, abdomen of male. Slightly reduced. 



9. Psetidothelphtisa magna, male, tirst abdominal appendage of right side, outer 



view. One and one-half times natural size. 

 10. Psetidothelphtisa magna, male, first abdominal appendage of right side, lower 

 view. One and one-half times natural size. 



