^°i893y''] PROCEEDINGS OF THE NATIONAL MUSEUM. 651 



Pseiidothelphusa dugesi. 

 (PI. Lxxn , Figs, i iiud 5.) 



This sjiecies is so closely related to jouyi that one might easily con- 

 found the two. It can be distinguished, however, first, by the liont 

 which is sinuous and slightly bilobed, more abruptly deflexcd than in 

 jouyi, with a strong marginal ridge visible fiom above and delined 

 by a submarginal groove; viewed Ironi in iVont the margin is nearly 

 straight; second, by the more compressed meral Joints of the ambula- 

 tory legs, which are slightly dilated in the middle, the upper edge thin; 

 third, by the appendages of the first segment of the male abdomen, in 

 which the inner tooth at the extremity is more slender than in jouyi and 

 is directed closer to the appendage. 



Color, dark olive- brown. 



Length of male 21 ; width, 33 ; length of cheliped about 53""". Length 

 of female, 20; width, 33.5; length of large cheliped, about 43. 



Cuernavaca, State of Morelos, Mexico, P. L. Jouy, August, 1802; 

 7^,1? (17722). 



A small female from the State of (luauajuato ( ?), A. Dug^s (4389), 

 has the meral joints of the ambulatory legs proportionally wider than in 

 the specimens from Cuernavaca, all of which arc nuich larger. 



Pseudothelphusa terrestris. 

 (PI. i.xxiv, Fifijs. 6 and 7.) 



This species much resembles yo///// and dugesi, but the carapace is 

 wider, the cervical suture deei)er and more conspicnons, the gastric re- 

 gion more elevated. Front not rounding downward as in jonyi but 

 abrujjtly defiexed as Induycfii, the nuirgin strongly ridged, defined by 

 a well-marked submarginal groov(^, and visible from above. Viewed 

 from in front the two halves of the margin slope downward toward the 

 center. The outer orbital angle is less advanced t\\nn in jouyi. The 

 denticles of the antero lateral margins are less prominent than in speci- 

 mens of jouyi of equal size, tlui obliteration in adults being even more 

 complete in this species. In the abdomen of the nmle the terminal seg- 

 ment is more acute than mjovyi', the appendage of the first segnuMit 

 differs in having at the tip on the onter side a much narrower lateral 

 expansion with a narrower, sharper tooth, and on the inner side, a 

 somewhat scythe-shaped tooth. Chelipeds similar to those at' jouyi; 

 the lower outer margin of the merus has a distinct line of granules. The 

 ambulatory legs are more compressed, the merus Joints thin above^ 

 and wide in the center. 



Color, olive-brown. 



Length of S 21; width, 3G; length of large cheliped, a))out 50""". 

 Length of 2 10; width, 32; length of large cheliped, about 33. In this 

 female s])ecimen the chelipeds are almost equal. 



Collected by IVIr. V. L. .louy at Atamajac, 3 miles Avest of ( Jinidalajara, 

 April, 15, 1802,3 <J , 2 $ (17723); also at Barranca Ibarra, near (Juada- 



