540 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
head very distinctly pitted, as is the lateral region of body; pits on 
dorsal surface of back dim, while the skin of the abdomen is shiny, 
smooth; small pits on skin on underside of tail. 
Variation.—The young of this form (and related forms of the B. 
cephalica group of the genus) have the vomerine teeth in two to 
four series, running somewhat diagonally, and often more numerous 
than in the adult. As the specimens grow older the teeth tend to 
form a single, often somewhat irregular, series. 
Adult males have the typical narrow head of the group, the snout 
sharply truncate, with prominent subnarial swellings. ‘The submental 
gland is well defined, and the cloacal walls are papillate. The limbs 
are somewhat longer and overlap the width of a costal fold in the 
largest specimen. 
The red color of limbs and tail fades in preservative; however, 
there usually remains a lighter tail termination and cream spots on 
the underside of the leg. 
Data on type and paratypes of B. c. rubrimembris 
U.S.N.M. No. 
Character Sarannnnnnennnal | IRIAN RIE T REET 
110661 | 23007 | 12495 | 29831 | 110659 | 110660 
EST o> da ANNA AL ROB CE ac aga MAU eRe US aL ee Pan Re aw Amat re) ro 2 rot ve) rou 
Snout tosventilenethy (rm) ee sce ee er eee een 53 50 47 45.5 39. 5 37 
Pailiten othy Cm ms) oe ee eS SMe ae Ucar Re ALES 38 43 38 37 35 35 
Snoutitomuchalifold: (mms) sce eee eae none 12 14 12 11.1 9.9 10 
Snout tosforelegs (ims) aes eee ee 15. 6 17 14 14 12 12.1 
ON SEMYOL ST OG: (UTE s) Beal ore mde che Ure ol me ae 2.5 3.4 2.8 2.4 2.3 2.3 
Width of-head’ (mime) Oars nis essa ity ae Aaa ae ae en a we 9 8 8.8 8.6 7.5 7.1 
Interorbital width Qmm.)_-2---. 2.222222. 2222222 ee 3 3 2.6 OD, of 2.1 2.3 
D prgsy 0X6 BG 9 0b o ae) SWUM pa ee ae er a a WER a 1.8 1.9 1.8 2 WS¢ 18 
YiNG iy 6011 60016 0 01) JADU eR Na le PR NN SN A UUM UU LAND A 2 a 13.5 15 L252 11 9.8 10. 5 
Mere Zat G0 00 by) POL IO I ee a eee as een RIV ey UE Cy 15.8 16 13. 2 13.2 2 11 
JNS-GUN Wa HON tea Korda Gaal eos) Pui a eee uh Gu acini at 29 26.2 | 28 24 22 21 
Head iwi d thiimvler gt beeen eal al areal es aay een Side 6.2 5. 32 5.3 4.7 5. 2 
Head length in length________._____- Ae EPA ENE PLLA MAE 4.5 3. 5 3.9 4.1 4 3.7 
Maxillary-premanillary teeth____._._.__________._____- 44 41 33 33 36 41 
VOMEFINE Fee Ea sae SU UE PN I eh ALY 16 14 15 15 19 23 
Mandibular teet bei ciai ee ie aan Ses UN Li Mage) Relite ce ek 44 42 33 39 40 38 
Parasphenoid teeth in two groups.________-_-__--_---- Yes Yes Yes Yes Yes Yes 
TADS OUCH A ee aN LO LOR Se NN Ue RS DC St a tea Yes Yes Yes Yes Yes Yes 
COSEAI ETO OWES ees NOUBA OE sre eM ae DN ACN ee NO il 11 11 11 ll il 
Tall OrOOV ES wc eteria 2 Mie) Ure LC NC AE CADE OU es Oat coe rene Le 22+ 26-+- 19-++ 21-++ 23-++ 23-+- 
Vomerine teeth in seriesof220 220 ye ee 1 1 2 1 2 2 
| 
Certain specimens from near Durango, Hidalgo, seem to show 
characters that point to B. cephalica cephalica, as well as to the form 
here described. In consequence we suspect intergradation with this 
form occurring in Querétaro and México. 
The three specimens in the National Museum collection were found 
under stones in a grassy, unforested ravine at 4,500 feet elevation, in 
company with Bolitoglossa gigantea. The form has a very peculiar 
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