112 Proceedings of the Biological Society of Washington. 



The coloration of the three specimens secured by Mr. Dunn, two from 

 the type locaHty and one from Xico near Jalapa, is singularly uniform. 



The dorsal surface is lichen gray, rather smoky with tiny black spots 

 scattered over the head and back; the gray limbs are faintly banded with 

 ill-defined cross bands. There is a black spot above the tympanum 

 extending to the insertion of the fore limb ; three dark spots below the eye 

 extending to the lip margin. The two posterior spots come directly to the 

 eye margin; the anterior spot is separated by a short distance from the eye 

 margin itself; another distinct spot on each side of the snout extending 

 anteriorly from the nostril to the tip of the no.se. The smallest of the three 

 specimens is slightly more reddish than the other two. The markings of 

 the head, however, are entirely characteristic. 



I can not find that this species has been described. There is a possibility 

 that it may be what Brocchi confused with Guenther's E. conspicillatus. 

 The type locality of this form was, of course, in Ecuador but Brocchi had 

 something from Orizaba which, erroneously, he identified with conspicil- 

 latus and I should judge from the meagre description given that he might 

 have had the frog now before me, except that from his description the tym- 

 panum does not appear to have been so large. 



Syrrhopus mystaceus, sp. nov. 



Type M. C. Z. No. 8241 from Jalapa, Mexico. Collected by E. R. Dunn, 

 August, 1921. 



Habit similar to that of Eleutheroddctylus sallaei. Tongue small, 

 oblong and entire; vomerine teeth absent; nostril much nearer tip of snout 

 than eye; its distance from the eye being equal to the orbital diameter; tym- 

 panum very large and round, distinctly larger than the eye; fingers without 

 dilated tips; first and second and fourth about equal in length; toes with no 

 trace of web and with no apical discs; metatarsal tubercles small and weak; 

 soles, however, with small scattered tubercles; a faint tarsal fold; the hind 

 limb being carried forward along the body; the heel reaches well beyond the 

 tip of the snout; the heols overlap when the hind limbs are placed vertically 

 to the axis of the body; skin above with many small tubercles and plicate 

 rugosities ; a faintly defined mid-dorsal granular ridge and a pair of granular 

 ridges converge from the eyes to the mid-dorsal region and then extending 

 backward run parallel to each other as far as the sacrum; several long but 

 irregular lateral glandular folds also present; upper surface of thighs with 

 scattered tubercles like the back; posterior aspects of thighs closely and 

 strongly granulate; belly and anterior aspect of thighs smooth; a strongly 

 developed ventral discoidal fold. 



Dimensions. — Tip of snout to vent 26 mm. 



Width of head 9.5 mm. 



Diameter of eye 2.8 mm. 



Tympanum 3.2 mm. 



Fore leg from axilla 15 mm. 



Hind leg from vent 43 mm. 

 The color of the unique specimen is a dark mahogany brown above, ashy 

 below; the hind limbs are faintly cross-barred; there is a light dusky band 



