478 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 91 



and the fact that the rostral carina goes straight through to the tip 

 of the rostrum seem to identify this species with the A^ rather than 

 the A^ group. 



In a measure, perhaps, A. franca and A. jujuyamxi are to be re- 

 garded as transition forms lying between those having a ridge-roofed 

 rostrum and those in which the rostrum is longitudinally more or 

 less troughed or excavate either side of the median carina. 



Certainly A. jujuyanu, next dealt with, is very closely related to 

 A. huTnachuaca^ with which it might have been grouped except for 

 its sharply carinated rostrum, which for this reason appears to be 

 more or less definitely ridge-roofed, as the broader, flatter, blunt- 

 ridged rostrum of A. htmmchuaca decidedly is not. Moreover, the 

 latter possesses a definite palmar crest of which there is no trace in 

 A. jujuyana. 



Distnhution. — So far known only from the type locality. 



AEGLA JUJUYANA, new species 



FiGUEE 52 ; Plate 26, E 



Description. — A species of moderate size, attaining a length of 

 carapace and rostrum together of about 29 mm. Otherwise I have 

 seen but two small specimens of 18 and 18.5 mm., respectively. 



Carapace moderately convex. Rostrum fairly wide-triangular, 

 scarcely exceeding eyes by the length of the cornea; median carina 

 sharply crested to the anterior extremity, giving rostrum a definitely 

 ridge-roofed appearance, particularly in the anterior half or third 

 of its free portion, even though the lateral slopes of the dorsal sur- 

 face of the rostrum toward the base of the rostrum are somewhat 

 concave; rostral carina for whole or greater part of its extent with 

 a single row of good-sized corneous scales, at least on that portion 

 of the rostrum lying anterior to the posterior margins of the orbits ; 

 posteriorly the carina scarcely runs back to the anterior margin of 

 the protogastric lobes; these are low, anteriorly blunt and scarcely 

 marked except for the few corneous scales outlining them anteriorly. 

 Epigastric prominences also low, scarcely better developed than the 

 anterior margin of the protogastric lobes. 



Orbital sinus of moderate width; orbital spine small, placed well 

 up on inner margin or slope of anterolateral spine and set off from it 

 by a small blunted-V-shaped sinus. 



Anterolateral spines, though fairly short, appear moderately slen- 

 der, reaching at least to middle of cornea or beyond. Anterolateral 

 angle of first hepatic lobe acute and tipped with a small, sometimes 

 acute corneous scale; second and third lobes indicated, somewhat 

 scabrous, second usually a little better marked than the third. 



