FROGS OF COLOMBIA — COCHRAN AND GOIN 461 



lrmb surfaces drab, with three narrow brown crossbars on femur, 

 widening on tibia, and becoming less distinct on foot; a pair of similar 

 bars on forearm; posterior femur dark clove brown with a wavy 

 cream buff diagonal line bisecting the dark area from about the mid- 

 point of the femur and ending just above and behind the knee; a 

 dark brown stripe along posterior arm surfaces, entire on forearm 

 but broken on upper arm; anterior femur with a longitudinal row of 

 small dark spots or a wavy dark line where the spots run together; 

 sides of body olive, the tops of the granules and tubercles paler; 

 venter ecru drab, immaculate except for a dark stripe around edge of 

 lower jaw ending below gland at mouth commissure and for small 

 dark spots on lower tibia and foot; side of head seal brown in loreal 

 region, with a pale buff stripe along side of jaw to shoulder, dull 

 brown between this stripe and edge of upper lip; palms and soles dull 

 brown except for tubercles and tips of digits, which are dull buff. 



Remarks. — This species is more closely allied to L. poecilochilus 

 poecilochilus and L. p. diptychus than it is to L. sibilatrix, which in 

 its most typical development has two pairs of distinct dorsal folds 

 between the outer pair, while the forms of L. poecilochilus have 

 smooth backs between the outer pan of folds. 



L. mystaceus is distinguished from both forms of L. poecilochilus by 

 having a sharply marked white streak along the upper lip, set off by 

 darker areas from both the edge of the lip and the loreal region. Both 

 forms of L. poecilochilus have spots on the lip. 



The pale oval or diamond-shaped spot in the center of the back 

 above the shoulders, very characteristic of mystaceus, sometimes is 

 found in both forms of L. poecilochilus and it also occurs in L. 

 podicipinus petersi and in L. intermedius. These five forms, plus L. 

 mystacinus, which so far has not been found in Colombia, represent a 

 "natural" grouping of forms with essentially similar body form, size, 

 and color that differ in small but quite constant details. 



Specimens Examined 

 COLOMBIA 



Antioquia: UraM, Rfo Curralao, CNHM 63847. 



Caqueta: Florencia, USNM 147039-47; La Tagua, Tres Troncos, Rfo 



Caqueta, CNHM 69749. 

 Choc6: Sautata, Atrato, CNHM 74920 (2). 



Meta: Acacfas, USNM 147048-50; Cordillera Oriental up from Villavicencio, 

 1,100 m., Buena Vista, USNM 146435; Mouth of Carlo Losada, USNM- 

 150488-9; Carlo Losada on upper Rfo Guayabero, USNM 146436; Villa- 

 vicencio, 400 m., USNM 146433-4, 147396; Villavicencio, CNHM 81790-1. 

 Norte de Santander: Cucuta, MLS 241; Rfo Zulia, USNM 147051-2. 

 Putttmato: Puerto Asfs, MLS 239. 

 BRITISH GUIANA: Kartabo, USNM 118058. 



