Rana septcntn'onalis 403 



On July 2 at Adirondack Lodge, Hart or Clear Lake (2155 ft.) Messrs. 

 S. C. Bishop and C. K. Sibley found mink frogs croaking at 8:30 a.m. in 

 broad sunlight, at mid-day and in the evening. "On July 13 in the same place 

 S. C. Bishop heard males croaking just at daybreak in the middle of the morn- 

 ing and rarely in the afternoon." On July 14 he records "Frogs croaked all 

 night. The male croaking expands the throat and sides of head below ears. 

 The common note is a cut-cut — with sometimes a 'burred' gh-r-r-r." On July 

 15 "dark and rainy. Only a few frogs croaking during the night and very 

 infrequently in the daylight. P.M. No croaking this period." 



This species seem to have about the same sac development as R. palustris. 

 In some from Onekio, N. Y. it seemed that the head if viewed from dorsum 

 appears at croaking to have no perceptible lateral sacs. Viewed from below 

 the central throat swells out with a sac on either side of this central part. 

 This sac however appears to be just below corner of the mouth or directly 

 below the vertical of the tympanum but not directly below the ear or between 

 ear and shoulder . 



From these we concluded it did not swell out as in a Cope's frog male. 

 A male Mr. Bishop brought me from Clear Lake has the lateral sacs extending 

 between tympanum and shoulder. The caudal margin of the lateral sac 

 beyond the rear vertical of the tympanum or even to the vertical of the rear 

 arm insertion. In this frog it is very apparent from the dorsum but not so 

 striking as in Cope's frog. This frog, as with other species of frog, can be 

 made to croak by seizing it just in front of its hind legs or better by laying 

 it on its back and by rubbing its belly. Then it will croak continuously. 

 Each individual croak in nature occupies about one second or less. If not 

 in chorus their croaks are not heard long distances when their associates, 

 green frogs or bull-frogs are calling. At Onekio, N. Y. we heard them. On July 

 14 we could hear the males croaking 60-100 yards away. In croaking one 

 or two frogs seemed to move forward in the water with every croak and the 

 body return to position immediately after each croak. The vocal sacs were 

 not very well revealed in the field. A frog usually gave two croaks, occa- 

 sionally one, occasionally 5 or 6. Its croak is different from that of the Cope's 

 or Carpenter frog though Norton makes a carpenter comparison in describing 

 the croak. 



MATING 



Male (From life June 18, 1923). On back buffy olive, light brownish 

 olive or olive; this same color becomes Isabella color on upper side of hind 

 legs, amongst this buffy olive, etc. are wavy lines or spots of oil yellow, yellow- 

 ish citrine; on the middle of the back are two irregular rows of black spots 

 often round, widely separated, at times elongate. Region of dorsum forward 

 of rear of tympana is without black spots but buffy olive with plenty of cosse 

 green or lettuce green interspersed. This color solid on the upper jaw to 

 level of nostril to tympanum. Above and below tympanum a line of courge 

 green. Just back of tympanum courge green or yellow green spots and lines 

 with black. On sides mixture of yellow-green, black and hazel (or tawny 

 olive or fawn). Tympanum tawny olive, buffy brown or Isabella color. Upper 



