052 NKW SPKCIKS OF FHF-STI-WATKR CRAI'.S RATHBUN. 



lajara, April 20-22, 18!>2, under stones on moist hillside, about 10 feet 

 above the river, 3,700 leet above scm level, and l.r)00 feet below (Innda- 

 lajara, 8 5,8 9 , small (17724). 



A". Front voitirally (Icllcxcd, roiiiiiiin ;i blunt crest. 

 li'. Crest sinootli. 



Pseiidothelphiisa verticalis. 



(I'l. L.\xi\-, Fi<;s. 8 and 9.) 



Carapace flattened, obscurely punctate. Cervical suture deep and 

 short, continued to tlu^ nuiri;in. Epigastric lobes depressed. Front 

 vertically dellexed; superior margin not ridged or granulate, but pre- 

 senting a smooth, rounded surface, which is almost straight and 

 scarcely interrupted l)y the shallow median sulcus. Iid'ero-frontal 

 margin with a prominent ridge, indistinctly granulate, a- submarginal 

 groove, and a shallow nu'dian sinus. TIu^ ridge is continuous with the 

 orbital margin. Autero-lateral margins denticulate. Orbits deeper 

 than iujouyi, sometimes with a shallow hiatus. In the male al)domen 

 the appendages of the tirst segment are very diiferent from those of 

 the species above described (Fig. 9). Chelipeds with the nu'rus tri- 

 angulate, broadening distally, shorter than in joui/i; ui)per margin with 

 dentiform tubercles, which become almost obsolete toward the carpus; 

 lower inner margin with two irregular rows of spiny teeth; lower sur- 

 face with a line of granules on the outer and distal margins; carj^us 

 shorter than in jonyi; large hand very deep and swollen, nuich larger 

 than tlu^ small hand; fingei's gaping in the larger cheliped. The ambu- 

 latory legs are compressed, broad; nuuus joints much dilated, with a 

 thin upper margin, obscurely denticulate. 



Length of $ 25; width, 42; length of large cheliped 72""". 



Length of 9 22.8; width, 30; length of large cheliped 54""". 



Tehuantepec, Mexico, Dr. Spear; 4 cJ , 5 9 (2537). 



B". Crest tiiberculate. 



Pseudothelphusa xantusi. 



Carapace in shape resembling the i)receding, slightly convex, punc- 

 tate, granulate anteriorly aiul laterally. There is a trace of an addi- 

 tional suture behind tiie cervical suture, which is not an even curve, 

 but turns slightly toward the horizontal near the margin. I-'pigastric 

 lobes welJ-marked, tuberculate, sejiarated by a. deep, narrow median 

 sulcus, which divides the sup(uior frontal crest. This crest is blunt, 

 and is i)rovided with .a wide row of tubercles, and near the orbit turns 

 backward, tbllowing the linc^ of the orbit for a short distance. Inferior 

 frontal margin with a i)rominent ridge, which x)roJects forward, is some- 

 what bilobed, grantdate, and visible from above. Orbits large, not 

 tilled by the eyes; margin granulate except for a short distance be- 

 neath the outer angle, where the absence of granules sinudates a 

 shallow lissnre. Anterolateral margin denticulate, slightly interru[>ted 



