324 U- S. NATIONAL MUSEUM BULLETIN 2 06 



distance between nostrils. Tympanum large and distinct, three- 

 fourths the width of eye, separated from eye by an interval nearly 

 equal to its own diameter. Fingers free, with lateral ridges, tips very 

 slightly dilated into disks which are not grooved above, fourth a little 

 longer than second, much shorter than first, reaching halfway on 

 penultimate phalanx of third; a very pronounced spur on outside of 

 first finger, a heavy tubercle at base of thumb and a larger irregular 

 one on palm of hand; the subarticular tubercles well developed; toes 

 with lateral ridges, their disks a trifle enlarged, the second and third 

 with traces of a groove on top, third toe much longer than fifth, 

 reaching beyond base of antepenultimate phalanx of fourth; a small 

 but prominent inner metatarsal tubercle and a round flattened outer 

 one; a heavy, curving, glandular ridge along inside of tarsus. Body 

 stout, in postaxiilary region a little less than the greatest width of 

 head. When hind leg is adpressed, heel reaches to nostril; when limbs 

 are laid along the side, knee and elbow overlap; when hind legs are 

 bent at right angles to body, heels overlap considerably. Skin of 

 dorsum highly glandular; a dorsolateral ridge from behind eye to 

 sacrum where it becomes lower but much wider, involving the whole 

 inguinal region; between these folds a number of large and small warts, 

 especially heavy and large on the sacral region ; a heavy supra tympanic 

 ridge extending behind the tympanum in a triangular gland ending in 

 a knob in front of shoulder; a transverse fold of skin above the anus; 

 skin on upper surface of legs heavy and glandular but not especially 

 thickened ; a heavy tarsal skinfold ; venter smooth with a slight ventral 

 disk; postfemoral areas granular; forearms greatly enlarged in the 

 male. In the breeding season a large horny black tubercle on either 

 side of the chest appears, as well as a black horny covering to the 

 projection on the side of the first finger. 



Dimensions. — Head and body length 146 mm.; head length 52 mm., 

 width 59 mm. ; femur 67 mm. ; tibia 71 mm. ; foot 72 mm. ; hand 37 mm. 



Color in alcohol. — Dorsum wood broAvn, with lighter indistinct 

 suffusions; bases of dorsolateral glands and tubercles darker brown; 

 upper lip with three slanting diagonal light stripes outlined by darker 

 areas ; groin and posterior femur light buft' (yellow or red in life) with 

 heavy dark reticulations. Venter buff with a coarse dark network, 

 which is less dense posteriorly, but almost solid brown on the throat; 

 soles and palms dark with light tubercles. 



The color pattern on the head of young labyrinthicus is striking and 

 much brighter than that of adults. The complete color description 

 of a 26 mm. labyrinthicus, MP 1011, is given here: Dorsum ecru-drab, 

 darkening posteriorly; a narrow sepia crossbar between the eyes, 

 edged anteriorly by a pale, wide, di'ab bar, the top of the snout anterior 



