Aegla scamosa Ringuelet, 1948

Diagnosis. Anterolateral spine of carapace reaching and sometimes exceeding base of cornea; protogastric lobes absent; transverse dorsal line sinuous; rostrum triangular, of medium length, carinate with indistinct scales on the distal third; front narrow; anterior angle of ventral margin of epimera 2 with two or more scales; fourth sternite slightly raised, medially, with scale; proximal outer margin of moveable finger of cheliped without lobe; palmar crest present, sub-rectangular, indented; inner margin of ventral face of ischium of cheliped only with five tubercles; dorsal and ventral margins of merus of second pereiopod with scale-shaped tubercles and scales. (Modified from Bond-Buckup & Buckup 1994).

Measurements. The specimens examined showed a mean CL of 24.04 mm (n = 8 males; 1 female). Species with rostrum of medium length, which modified the species diagnosis of Bond-Buckup & Buckup (1994). PCW/FW ratio ranging from 1.90 to 2.12, mean 1.97; i.e., a narrow front. AL/AW ratio ranging from 1.52 to 1.85, mean 1.61; areola subquadrate.

New records. ARGENTINA: Province of Mendoza: Rio Mendoza, with Ruta 7, near to 10 km of Upslatta. 32º41'24"S, 69º21'37"W; 1709 m, 01.xii.2001 (UFRGS 3217, 4M, 2F, 1J); Frei L. Beltran, Finca Gune, Mendoza, 27.ii.1942 (MLP 0 0 86, 1M, 2F); Province of San Juan: watercourse of Água Negra, tributary of River Jachal, with Ruta 40, at 7 km of San Juan, San Juan Jachal. 30º19'59"S, 68º42'39"W; 1086 m, 02.xii.2001 (UFRGS 3215, 2M, 3F, 6J); idem, ibidem (UFRGS 3216, 1M, 4F); River Jachal, near to Ruta 150, with S.J. Jachal and Rodeo. 30º12'52"S, 69º02'14"W; 1476 m, 02.xii.2001 (UFRGS 3223, 3M, 2F).

Former distribution. ARGENTINA: Southern San Juan Province, northwestern Mendoza Province (Bond-Buckup & Buckup 1994).

Present distribution. ARGENTINA: Colorado River system in the provinces of San Juan and Mendoza.

Remarks. The localities in San Juan Province are new records, and enlarge the geographical distribution of this species.