504 PROCEEDEISPGS OF THE NATIONAL MUSEUM vol. 91 



type). Of these three species, only A. concepcionensis has the an- 

 terior epimeral angle definitely acutely produced and spined; in 

 A. affmis it is rounded off and unarmed; in A. papudo likewise 

 rounded off and generally unarmed, though the angle may carry a 

 tiny adventitious corneous scale, spinule, or "cornule." The hands 

 of A. papudo and A. concepcioTiensis are more or less ovoid and swol- 

 len or inflated, more so in the former than in the latter, while in 

 A. affinis they are more or less subrectangular, and less swollen, though 

 rougher, more scabrous, than in either of the others. A. papudo has 

 the most convex carapace, A. afjinis the least, the convexity of the 

 carapace of A. concepcionensis being intermediate. Further, the sev- 

 eral suture lines which meet to form the anterolateral angles of the 

 cardiac area of the carapace run together to form a short, transverse 

 or obliquely transverse bar in A. concepcionensis^ and a more or less 

 longitudinally oriented bar in A. papudo and A. a-ffinis. 



DistHhution. — In addition to the type material, I have seen three, 

 not altogether typical males, between 15.5 and 24.5 mm. in length of 

 carapace and rostrum together, from Corral, Chile, collected by Dr. 

 Thomas Barbour (M.C.Z. No. 10481), and two males of 25.5 and 

 26.5 mm. respectively, collected by Dr. A. Santa-Cruz in the vicinity 

 of Concepcion, Chile, and presented to the United States National 

 Museum by our good friend Dr. Carlos E. Porter, of Santiago. 



AEGLA LAEVIS (Latreille) 



Figure 61 ; Plate 28, D 



Oalathea laevis Latreille, Tableau encyclopMique et m^thodique . . ., pt. 24, 



pi. 308, fig. 2, 1818. 

 Aegla laevis Leach, Dictionnaire des sciences naturelles, vol. 18, p. 49, 1821. 

 Aeglea laevis Desmabest,^" Considerations g4n6rales sur la classe des Crustac^s, 



p. 178, pi. 33, fig. 2, 1825. 

 Aegla laevis Rathbujn, Proc. U. S. Nat. Mus., vol. 38, p. 602, 1910 (neither 



synonymy, except first tvpo entries, nor distribution, except Chile, applies). 



Description. — A species of small to moderate size, the largest speci- 

 men seen measuring 24.5 mm. in length of carapace and rostrum taken 

 together. 



Carapace moderately or a little better than moderately convex. 

 Kostrum more or less Ungulate (more tongue-shaped than sharply 

 triangular), lateral margins more or less subparallel in the midsec- 

 tion of the free portion, exceeding eyes by I14 times to nearly twice 



"Inasmuch as nearly all authors since Desmarest (with the exception of Nicolet, 

 Girard, Fritz Miiller, and Moreira) have considered the genus monotypic and so have failed 

 to give specifically recognizable descriptions and illustrations of their material, it is im- 

 possible to assign correctly the many specimens that have in the past been determined as 

 Aegla laevis to the species to which they properly belong. What I take to be true Aegla 

 laevia was never well enough characterized to distinguish it from the now known Chilean 

 species, or, in fact, from any species of Aegla other than Nicolet's A. denticulata. 



