104 Trans. Acad. Sci. of St. Louis. 



lioma, Kansas, Nebraska, Colorado, Dakotahs, Oliio, Illi- 

 nois, and Missouri. Missouri localities: — Montgomery, 

 St. Charles, Franklin, Jackson, Jefferson, and St. Louis 

 counties. In Illinois, Madison and St. Clair counties. 



Habits. — With the first mild spring days, before all 

 the snow and ice of winter have disappeared, the loud 

 trill of this small species may be heard from pools and 

 ditches. The note is so resonant that on quiet evenings 

 it may be heard a half mile or more and is commonly 

 attributed to larger frogs. Later in the season the note 

 is not heard and the species is not often seen. It feeds 

 upon insects. Hemiptera, Coleoptera, and other insects 

 have been found in its stomach. It is not commonly met 

 with. March 17th I caught over a dozen from a ditch 

 into which I had chased a Thamnophis radix. Other dates 

 of capture : — Apr. 22, 23. 



Genus hyla. 



Digits expanded into discs at their tips. Toes webbed, fingers more 

 or less webbed, or free. Tympanum distinct. Eustachian tube well 

 developed. Tongue broad, entire or slightly excised, adherent, or more 

 or less free behind. This is a genus of arboreal frogs. Four species are 

 found in the State of Missouri. (Garman.) 



Key TO Missouri Species. 



Green or gray, with a yellow stripe on each side. carolinensis. 



With an X-shaped dusky mark on the back. Snout produced in 

 front of nostrils. Palms and soles not granulate. 



pickeringii. 



Olive or green above, with small, irregular dark spots. A V-shaped 

 mark between the eyes. Toes one-half webbed. Tympanum 

 one-half the eye. sgiiirella. 



With numerous irregular dark markings. Palms and soles gran- 

 ulate. Snout bluntly rounded; nostrils almost terminal. 



versicolor. 



