198 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



No. 3344, this number was originally assigned to "12 + " frogs. A 

 notation made some years later states that 15 of these specimens 

 had been reentered under Nos. 39383-97. Fourteen paratypes 

 (Nos. 39383-96), in addition to the electotype, are now in the pos- 

 session of the museum. One paratype (M.C.Z. No. 2600) was 

 evidently sent to the Museum of Comparative Zoology as an exchange. 

 Of these 14 paratypes, nine have a head-and-body length that is 

 not greater than 65 mm. The largest (U.S.N.M. No. 39383) has 

 a head-and-body length of 95 mm. 



Inasmuch as some diagnostic importance has been assigned to the 

 relative lengths of the toes, the average ratios for this series of 14 

 specimens have been computed as follows: Lengths of first, second, 

 and third toes, measured from inner metatarsal tubercle to tip of 

 corresponding toe, are equivalent, respectively, to 28.33, 51.18, and 

 74.22 per cent of the fourth toe. In the largest paratype (No. 39383) 

 the distance between the inner metatarsal tubercle and the tip of the 

 fourth toe is 46.5 mm., and the corresponding measurement for the 

 smallest (No. 39389) is 30.2 mm. The following measurements were 

 taken from the electotype and the largest paratype: Head-and-body 

 length, 77 and 95 mm.; transverse diameter of tympanum, 6 and 7.4 

 mm.; transverse diameter of eye, 7.5 and 8 mm.; and anterior edge 

 of eye to nostril, 5.1 and 5.9 mm. 



The three paratypes of Rana adtrita Troschel were collected by 

 Baron J. W. von Miiller somewhere in Mexico. As described by 

 Troschel, these have the same peculiar and characteristic color pattern 

 that so readily distinguishes R. montezvmae from other Mexican frogs. 

 The underside of the thigh is described as being reddish, but marked 

 with numerous white spots. Cope has mentioned the presence of pink 

 spots on the under surface of the thighs of a specimen he examined. 



Cope failed to designate a type specimen for his supposedly distinct 

 subspecies concolor and merely stated that it was collected by Dr. 

 Alfred Duges at Guanajuato. The original description is limited to 

 the following words: "Similar to the typical form, but of a uniform 

 fawn-brown color without the spots of the typical form." The sub- 

 species concolor was either overlooked or ignored by Cope two years 

 later, since it does not appear in the published synonymy of Rana 

 montezumae, although at the end of the accompan3ang description it 

 is stated that an unspotted brown variety had been found near 

 Guanajuato by Dug^s. Some of the specimens from Guanajuato are 

 considerably larger than those from Mexico City. The head-and- 

 body length of the largest specimen (U.S.N.M. No. 12684) is 125 mm. ; 

 transverse diameter of tympanum, 9.6 mm.; transverse diameter of 

 eye, 11.5 mm.; and anterior edge of eye to nostril, 7 mm. Most of 

 these specimens are so faded that the distinctive color pattern has 

 been obliterated, and a few of them are bleached almost white. Dis- 



