230 Mr. S. I. Smith on a neio Species o/^iEtlira. 



crests broad and deep, smooth or slightly punctate, with a 

 median line of fom* depressed tubercles ; lateral margin broken 

 bj a deep fissure at the cervical suture, and by a slight one a 

 little more posteriorly. Antepenultimate segment of the an- 

 tenn^e as broad as long ; anterior angle not prominent ; outer 

 margin arcuate, bidentate ; anterior margin armed with seve- 

 ral denticles j median carina prominent, but smooth and even ; 

 terminal segment short, the extremity almost truncate and 

 rather deeply five-lobed, the lobes rounded ; the inner margin 

 bidentate. Exposed portions of the abdominal segments 

 sculptured as if covered with rows of scales ; fourth segment 

 with a prominent median elevation above. Feet nearly 

 naked ; the merus segments slightly carinated above. Length 

 1*45 in. ,• length of carapax along the median line '45, late- 

 ral margin "50, breadth anteriorly -49. Male and female 

 do not differ. 



Several specimens from Egmont Key, west coast of Florida, 

 collected by Col. E. Jewett and William T. Coons. It is 

 specially interesting as the representative of a genus hitherto 

 known only from the Old World. 



^tlira scutata^ sp. nov. 



Carapax transversely and regularly elliptical ; margins 

 thin, slightly dentate, the denticles separated by broad and 

 very shallow sinuses ; posterior margin nearly straight in the 

 middle ; anterior margin straight and parallel to the posterior 

 margin for a short space outside the eyes ; front projecting 

 horizontally, its margin forming a semicircle ; gastric region 

 elevated, with a broad median depression extending to the 

 front 5 anterior lobe of branchial region large and prominent j 

 the broad space between the branchial region and the antero- 

 lateral margin concave ; summits of the elevations and a 

 s^jace along the posterior border tuberculous, rest of the upper 

 surface smooth ; inferior lateral regions slightly convex and 

 smooth. Chelipeds fitting closely to the carapax ; the angles 

 projecting into dentate crests ; outer and inferior surface of the 

 hand coarsely granulous. Ambulatory legs short, the angles 

 projecting into thin, dentate crests. Sternum and abdomen 

 deeply vermiculated. Length of carapax 1'39 in., breadth 

 2-23. 



A single male of this species, the first of the genus dis- 

 covered in America, was sent with the Evihacus from La Paz 

 by Capt. Pedersen. It is at once distinguished from jE. scru- 

 2)osa, Edw., by the much broader and more regularly ellijDtical 

 carapax. 



The genus ^thra should evidently be placed near Crypto- 



