654 NEW SPECIES OF FRESH-WATER CRABS KATHI5UN. 



on lower outer inariiiii ; caiiml Joints si)iuulous above and distally ; pro- 

 ])0(lal Joints with small spines abox'e, below, and distally. 



Lengtli, 1*8.5; widtli, oO; len<>tli ot'clieliped, about (')~>""". 



Kiver Da^id, Chiriqui, United States of Colombia, about latitude 8° 

 28' N, longitude 82° 2-4' W., at an elevation of 4,000 feet above the sea; 

 "very rapid streams descending- from .Mount Cliiri(pii"; J. A. McNiel, 

 July, 1883; 2 $ (5512). In the same bottle there is an ambulatory leg- 

 of a sjieeimen one-half again as large, which is a])parent]y the same 

 species. 



Pseudothelphusa lamellifrons. 

 (PI. Lxxv, Fiji's. 2-5.) 



The earapace of this species is allied to that of colonihianu.s; the gran- 

 ules of the anterior and lateral portions are, however, more i)rominent, 

 and the cervical suture is supplemented by another shorter parallel 

 suture a little posterior to the lirst, but uot prolonged to the margin. 

 Front similar to that of colomhvmufi, but narrower and deeper. Ex- 

 ternal orbital fissure very shallow and broad, with a denticle iu the 

 middle. Antero-lateral margin very thin and acute, with fine teeth a 

 little more prominent than in colomhianus and crowded close together. 

 Ischium of maxilliped broadening noticeably at the distal end. Abdo- 

 men of male contracted at the fifth segment (Fig. 4); the extremity of 

 the appendage of the first segment is laminate, and folded and com- 

 pressed laterally, the inner side having two lobes above, the posterior 

 one very large, and the outer side with a blunt tooth pointing forward 

 and outward (Fig. 5). Chelipeds in shape and armature resembling 

 those of Colombian i(,s, but the granules are prominent; the upper and 

 lower margins of the basal portion of the larger ]m»podus more acurate 

 than in those of the fenmle of Jthat species. Fingers in contact. The 

 meral Joints of the ambulatory legs are comi)ressed, very wide at the 

 center, the upper edge thin. 



Length, 22; width, 34.o; length of clieliped about 4()""". 



Isthmus of Teliuantepec, Mexico, F. E. Sumichrast; 3 males (3289). 



Pseudothelphusa lichniondi. 



(PI. LXXV, FiiiH. (i-10.) 



('arai)a('e more convex than iu the two preceding species, finely 

 punctate, with scaly granules near the lateral margin. Cervical 

 suture deep and almost straight. Epigastric lobes well marked, 

 ^ledian sulcus short, making a V-shaped notch in the superior frontal 

 margin. There are three faint depressed tubercles arranged trans- 

 versely across the gastric region. Margins of front and orbits crenu- 

 late or granulate. Sui)eri()r frontal margin nearly straight, as seen 

 from above, but seen from in front, the two sides sl<)i)e downward to 

 the median line; the outer extremities join the orbital margin. Inferior 



