Hcpfiles and AmpJubinns of Illinois. 829 



small posterior lobes; extensively free posteriorly and laterally. 

 Nostril about midway between the tip of the snout and the 

 anterior border of the eye. Tympanum very large, its diam- 

 eter equal to or exceeding the longitudinal diameter of the 

 eye. First finger extending but little or not at all beyond the 

 second when the two are opposed. Palms with two tubercles 

 each; soles with but one. Webs between the toes very large, 

 reaching a little beyond the base of the distal phalanx of the 

 fourth toe and quite to the tips of the other toes. Margins of 

 webs not so strongly incurved as in R. damitiois. 



Color above uniform olive-green or with obscure dusky 

 spots, darker posteriorly. Head often bright green. Yellow- 

 ish beneath. Pupil of the eyes black; irides golden. Tym- 

 panum brown or green, with a pale center. Anterior legs 

 with a few dusky spots. Posterior legs obscurely banded and 

 spotted with dusky; posterior surface of thigh mottled with 

 black. Under parts more or less speckled and mottled with 

 blackish. 



Length of body, 0; from tip of snout to*axilla, 2.06; femur, 

 2 25; tibia, 2.37; tarsus and fourth toe together, 3.94. 



Common in all parts of the State in permanent waters. 

 Lake Co., Peoria, Anna, Mt. Carmel (Yarrow). 



This frog is one of the largest of its kind. It is widely 

 known from its peculiar bass notes, which have a fancied re- 

 semblance to the expression " blood 'n' 'oun's." It rarely occurs 

 away from the water and is most commonly seen at the mar- 

 gins of lakes or bayous, with only the head exposed. At such 

 times it may be approached to within a short distance, and is 

 often caught by throwing towards it a hook biited with a bit 

 of red flannel. Frogs thus captured are often seen in the 

 markets and command a good price. Its food consists of in- 

 sects, mollusks, young frogs, young turtles, snakes, young 

 ducks, and field mice; in fact almost anything that will pass 

 between its capacious jaws. It passes more than one season in 

 the tadpole state. It is extremely abundant in the shallow 

 lakes in the northern and southern parts of the State. 



