1917) Camp: Notes on the Systematic Status of Toads and Frogs 123 
The specimen selected as the type is referred to by Mr. Harry 8. 
Swarth in his field notes as having been the object of an attack by a 
Clarke Crow. ‘‘The crow would peck at the frog and the latter would 
squeal and puff himself out to twice his normal size. It was his cries 
that attracted me.”’ 
KEY TO CALIFORNIA FROGS 
1. Vomerine teeth rudimentary, on two oblique ridges between the nares (see 
figs. 2, 3); tympanic region not darker than rest of head; fold along upper 
lip colored like rest of body, mottled or dark; red never present in 
coloration .. a Rana boylii and subspecies. 
2. When hind leg is brought forward along body, inside angle of bent tarsus 
and tibia reaching at least to nares and often beyond end of snout; 
tympanum covered with many hispid points. 
3. A light patch on top of head; darker area crossing the posterior half 
of each upper eyelid merging insensibly into dorsal color behind; 
body-length under 70 millimeters -................. Rana boylii boylii Baird. 
3’. No light patch on top of head; darker areas crossing posterior half of 
each upper eyelid, when present, contrasting with dorsal coloration; 
hbody-length reaching 81 millimeters .......... Rana boylii muscosa Camp. 
2’, When leg is brought forward, inside angle of bent tarsus seldom reaching 
beyond nares; tympanum smooth or with but a few hispid points; 
no light patch on top of head; body-length reaching 73 millimeters 
Rana boylii sierrae Camp. 
1’. Vomerine teeth large, in clusters on ends of indistinct oblique ridges inside 
nares (see fig. 1); tympanic region darker than rest of head (except often 
in pretiosa) ; fold along upper lip usually white or lighter than rest of 
head; red often present in coloration. 
4. When leg is brought forward along body, inside angle of bent tarsus 
reaching to eye or nares, never beyond. 
5. Back and top of head, set with inky, black spots; a small outer meta- 
Gars allt CrCl es eecea eee cece Rana pretiosa pretiosa Baird and Girard. 
5’. Baek, and top of head, with dark spots not so black as in pretiosa; no 
outer metatarsal tubercle —........ Rana pretiosa luteiventris Thompson. 
4’. Inside angle of bent tarsus and tibia, when brought forward, reaching to or 
beyond nares; back and top of head without inky spots —..........-.-.... 
SSeS Pb E ces Bek ees Som see eee caer Fre ere Rae PP eer nee Tana aurora and subspecies. 
6. Dorso-lateral folds indistinct; skin very smooth and thin; dorsal sur- 
faces unspotted or with small dots; size medium; total length reaching 
8 Ommaailiiimn(e ter Siescessce eee eee Rana aurora aurora Baird and Girard. 
6’. Dorso-lateral folds prominent; skin thick and often slightly rough- 
ened; dorsal surfaces with regularly placed, light centered spots; 
size large; total length reaching 100 millimeters —.... nee Pee 
Pes ee eee cee hse Rana aurora draytonii Baird and Girard. 
