Back gray, marhlcd with darker color; skin of back pustular; legs shorter; 

 Texas 



Castrophryne areohta (Strecker) MitchilFs Narrow'mouthed 



Toad 

 Microhyla areohta (Strecker) 



5. With parotoid glands or with a large, black, cutting tubercle on the sole 



of the hind foot, or both; pupil of eye vertical, round or horizontal 6, 



No parotoid glands; tubercles on the soles of the hind feet small or light 



colored; pupil never vertical 32. 



6. Belly smooth or wrinkled but not definitely granulated; pupil of eye 



higher than wide in bright light 7. 



Belly granulated; pupil of eye slightly wider than high; Family Bufonidae 



True Toads 13. 



7. Inner tubercle on the sole of the hind foot small; toes only slightly webbed; 



male with a short tail; Washington to Montana and California, in 

 mountain streams; Family Ascaphidae 



Ascaphus truei Stejneger Bell Toad 

 Inner sole tubercle large; toes well webbed; no tail in the adult; Family 

 Scaphiopodidae Spadefoot Toads 8. 



8. Parotoid glands absent; skin loose over top of head; back blackish, with 



scattered, irregular tubercles; Subgenus Spea 9. 



Parotoid glands present, although indistinct in S. cottchn; skin tightly ap- 

 plied to top of head; back brownish to greenish, with many small, uni' 

 form tubercles; Subgenus Scaphiopus 11. 



9. Skin almost smooth; with a bony elevation between the eyes; Texas to 



N. D. and Idaho 



Scaphiopus homifrons Cope Western Plains Spadefoot 

 Skin well sprinkled with tubercles or warts; area between the eyes smooth, 

 lengthwise ridged, or with a glandular elevation 10. 



10. Area between the eyes flat and smooth; West Coast, and southeastward 



to Ariz, and Texas 



Scaphiopus hammondii Baird Western Spadefoot 

 Area between the eyes lengthwise ridged or with a glandular elevation; 

 Great Basin, Ariz, to Idaho and Washington 



Scaphiopus mtermontanus (Cope) Great Basin Spadefoot 



11. Parotoid gland and tympanum indistinct; back usually marbled with 



lighter color; Texas to N. D. and Idaho 



Scaphiopus couchii Baird Couch's Spadefoot 

 Parotoid gland and tympanum distinct; light color on back usually as 

 two more or less distinct Icngthv^'ise stripes 12. 



12. Mid-area of top of head just behind the eyes (frontoparietal) elevated 



and tubercular; end of snout truncated, not extending beyond the 

 mouth; Okla. to Ark. and Texas 



Scaphiopus hurterii Strecker Hurter's Spadefoot 

 Frontoparietal area not noticeably elevated or tubercular; end of snout 

 more rounded, overhanging mouth; Mass. to Florida and Texas 

 Scaphiopus holbroo^n (Harlan) Eastern Spadefoot 



343 



