THE SPIDEE CEABS OF AMEEICA 



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Diagnosis. — Preor- 

 bital horns strongly 

 divergent and similar 

 to those of the ros- 

 trum. Posterior mar- 

 gin medially notched. 

 Posterior portion of 

 carapace longer than 

 wide. 



Description. — D i s - 

 tinguished from T. 

 lameUifrons by the 

 form of the front, the 

 lateral horns of which 

 are very divergent, 

 longer and more ele- 

 vated than tlie me- 

 dian, and by the two 

 lamellate expansions 

 which are prolonged 

 behmd the carapace. 

 The gastric region is 

 on a plane much more 

 elevated than the 

 front; it bears "three 

 tubercles, of which 

 two are anterior, and 

 the third posterior 

 and median. Dorsal 

 surface of hepatic re- 

 gion concave. There 

 is a large tubercle on 

 anterior branchial 

 lobe and a prominent 

 tuberculate crest on 

 branchial regions 

 above the lateral mar- 

 gin. The cardiac lobe 

 bears three small 

 tubercles. 



Chelipeds of male 

 more than twice the 

 length of postorbital 

 part of carapace; 

 palms somewhat di- 



