Thirteen specimens of frogs collected in the summers of 1960and 1961 in the Mexican states of Durango and Sinaloa representa heretofore unnamed species. The specimens have been depositedin the Museum of Natural History of the University of Kansas(KU) and in the Museum of Michigan State University (MSU).The species may be named and described as follows:
Tomodactylus saxatilis new species
Holotype.—KU 63326 (Fig. 1); obtained eight miles west of El Palmito,Sinaloa, approximately 6100 feet, on 23 June 1961; original field number,2354 of Robert G. Webb.
Paratypes.—A total of 12 specimens: KU 63327-33, same data as holotype,23-25 June 1961; MSU 4085-88, two miles north of Pueblo Nuevo, Durango,approximately 6000 feet elevation, 24 July 1960; MSU 4089, one half milewest of Revolcaderos, Durango, approximately 6600 feet, 29 July 1961.
Diagnosis.—A species of Tomodactylus possessing the following combinationof characters: (1) tips of two outer fingers truncate, about twice widthof narrowest part of digit; (2) tympanum small, less than one half diameterof eye; (3) ventral surfaces smooth; (4) contrasting marbled pattern on backand top of head, and (5) venter whitish, lacking dark marks.
Description of holotype.—Adult male; snout-vent length, 31.5 (measurementsare in millimeters and were taken by means of dial calipers reading toone tenth of a millimeter); width of head, 11.2; length of head, 10.3; horizontaldiameter of eye, 3.1, and of tympanum, 1.2; distance from eye to nostril, 3.8;internarial width, 2.9; interorbital width, 4.1; width of eyelid, 2.5; lumbargland (left side), 7.0 x 2.6; distance from axilla to groin, 15.2; tibial length,12.7; length of foot, 13.1.
Head slightly wider than body; tip of snout rounded, slightly truncate;canthus rounded; tympanum small, less than one half diameter of eye; tympanumhaving posterior margin ill-defined, separated from eye by distanceabout equal to diameter of tympanum; diameter of eye slightly less than distancefrom eye to nostril; width of eyelid about two thirds interorbital width;paratoid gland indistinct; lumbar glands high, separated from insertion of legby about one millimeter; back and sides of body having low, scarcely elevatedpustules; top of head, limbs and venter smooth; few low, whitish pustulesbelow and behind tympanum, and low on sides of body; posterior surface ofthighs and anal region pustulate; one pair of whitish postanal spots; ventraldisc attached near insertion of legs, lacking conspicuous transverse fold; skinloose on throat, chest and abdomen.