456 PROCEEDINiGS OF THE NAITTONAL MUSEUM vol. 91 



cavate ; hands more or less subovoid in outline ; rostrum plainly 

 troughed either side of well-defined, narrow, median carina. 



neuquensis (p. 493) 

 F^. No orbital spine or spinule as such (in unique type specimen), 

 outer margin of orbit merges with inner slope or margin of 

 anterolateral spine without appreciable offset; small spinules 

 or spiniform scales on orbital margin tending to run up onto 

 sides of base of anterolateral spine ; outer margin of palmar 

 crest fairly thick, rough-scabrous and somewhat lumpily 

 toothed ; upper surface of crest longitudinally and narrowly, 

 slightly troughed; hands more or less elongate-subrectangular ; 

 rostrum only very shallowly and more or less obsolescently 

 troughed either side of rather blunt and rounded-off median 



carina affinis (p. 495) 



Z>^ Dorsal anterior angle of epimeron of second abdominal somite armed 

 with a small spine or spinule (very rarely is angle armed with two 

 little spines or spinules). 

 E^. Fingers lacking lobular tooth characteristic of most species of Aegla, 

 fixed finger at most with only slight sinuosity on prehensile 

 margin ; no lobe on outer margin of movable finger near base, 

 although a few larger corneous scales or small spinules sometimes 

 occur there ; palmar crest low and thick, very broadly tri- 

 angular in cross section, dorsal surface at most very shallowly 

 and obsolescently excavate, more scabrous than spinulated, though 

 slightly mai-ked serrations of blunt crest may be spinule tipped; 

 rostrum triangular, thick-looking, only shallowly troughed either 

 side of blunt, proximally more or less swollen median carina. 



humahuaca (p. 498) 



E^. Fixed finger at least with a well-developed lobular tooth on its 



prehensile margin. 



F^. Rostrum more or less Ungulate (tending to be tongue-shaped rather 



than sharply triangular), lateral margins often more or less 



subparallel in midsection of free portion of rostrum; rostrum 



in lateral view noticeably bent downward, distally recurved; 



orbital spine or spinule present or not present, when present 



frequently much reduced, often no extraorbital sinus or notch 



(small extraorbital sinus and orbital spine or spinule perhaps 



always present in A. laevis talcahuano) . 



G^. Typically no orbital spine, normally outer end of orbital margin 



merging with inner slope or margin of anterolateral spine 



with little or no demarcation ; sometimes a slight sinuosity 



developing, or a more or less insignificant oblique offset ; 



rarely ever a real offset, notch, or projection with an orbital 



spinule on one or the other side at all like the condition 



found in either of the two species immediately following; 



rostrum broadly Ungulate, more or less triangularly so, but 



never sharply triangular as in aMao and riolimayana (F^, G\ 



and G- below) ; movable finger with a distinct, usually spined 



Or spinulated lobe on outer margin near base ; palmar crest 



not particularly prominent, posterior margin of crest usually 



noticeably upturned, troughed or excavate with upturned and 



broadly and shallowly serrate margins. 



concepcionensis (p. 501) 



