AMPHIBIANS 



173 



legs red; length 75 mm.: Montana and Utah, and westward to the 

 Pacific coast; common; entirely aquatic. 



Family 6. Microhylidae. — ^Narrow-mouthed toads. Head nar- 

 row and pointed; mouth small; no maxillary or mandibular teeth; 

 pelvic girdle firmisternal (coracoids and precoracoids fused midven- 

 trally) tropical toads with 4 species and 2 genera in the United States. 



Key to the United States Genera of Microhylidae 



ai Foot with one small tubercle i. Microhyla. 



a2 Foot with two large tubercles 2. Hypopackus. 



1. Microhyla Tschudi {Gastrophyne Fitzinger) . Head very narrow 

 and pointed, much narrower than the body ; skin smooth or glandular, but 

 not warty : 3 United States species. 



M. caroUnensis (Holbrook) 

 (Fig. 97). Size very small; body 

 stout; color dark brown to gray, 

 with two reddish dorso-lateral 

 stripes bordered by dark brown; 

 back and sides speckled with 

 black; length 25 mm.; hind leg 28 

 mm.: Virginia to Florida, and 

 westward to Texas; northward in 

 the Mississippi Valley to southern 

 Indiana. 



M. areolata (Strecker). Color 

 light gray above, marbled with 

 brown; under surface light gray, 

 with closely placed pale spots; skin 

 of back highly glandular; length 

 22 mm.: southeastern Texas. 



M. olivacea (Hallo well) (G. texensis Girard). Color gray or brown- 

 ish above, speckled or spotted with black spots tending to form longi- 

 tudinal rows; skin of back smooth: Texas, New Mexico, Oklahoma, 

 Kansas. 



2. Hypopachus Keferstein. Head small; body large; limbs short; 

 no vomerine teeth: 6 species. 



H. cuneus Cope. Color light brown or grayish brown, sometimes 

 tinged with olive, with a pale median vertebral line; length 41 mm.; 

 hind leg 46 mm.: southwestern Texas. 



2. The Eggs and Larvae. In the identification of the freshly laid 

 egg-masses of frogs and toads the first feature to be examined is the form 



Fig. 97. — Microhyla caroUnensis 

 Dickerson) . 



{from 



