Hyloxalus jacobuspetersi H. vertebralis Hyloxalus anthracinus

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(1) SVL, males 16.2-19.0, n = 14; females, 17.1-23.6 (x = 19.4; n = 15); (2) disc on Finger III not expanded; (3) Finger I = II; (4) fringe absent on Finger II; (5) disc on Toe IV not expanded; (6) fringe absent on Toe IV; (7) outer tarsal fold absent; (8) toes unwebbed; (9) dorsolateral stripe absent; (10) oblique lateral stripe present, extending to eye; (11) ventrolateral stripe absent; (12) discrete marks absent on gular-chest region; (13) solid black darkening on abdomen in males, venter white in females; (14) Finger III not swollen in males; (15) testes white (Coloma 1995).Colostethus anthracinus is compared with those species that lack toe webbing, have an oblique lateral stripe extending from the eye to the groin, and lack expanded digital tips (C. jacobuspetersi and C. vertebralis ). Colostethus anthracinus is distinguished from both species by having a solid dark darkening on the venter of males. Females of C. anthracinus can be confused with females of C. vertebralis; however, C. anthracinus lacks a clear middorsal stripe and two spots on chest. Colostethus anthracinus is further distinguished from C. jacobuspetersi by lacking a spotted or reticulated venter and by its smaller size.

The original description is adequate except that Edwards' (1971) “dorsolateral stripe” is an oblique lateral stripe, and Finger I is considered to be about equal in length to second herein, whereas Edwards (1971) reported Finger I longer than Finger II. Dorsal coloration varies. In some specimens from the type locality, the dorsum is uniformly patterned in having a triangular shaped mark on the dorsum of head, followed by a black middorsal stripe. The middorsal stripe is shorter in specimens from Mazán and southeast of Gualaceo, and it is absent in some specimens from the Abra de Zamora. A black dorsolateral stripe extending from scapular region to the vent is always present; however, in two specimens from the Abra de Zamora this stripe is diffuse. The dorsum is speckled with minute, elongated pale marks that are imbedded in the black stripes and marks in some specimens. Ventral coloration varies ontogenetically; thus, larger males have blacker venters than smaller ones, and females have increased minute black stippling on the throat with age (Coloma 1995).A recently metamorphosed juvenile (QCAZ 2697) has a SVL of 12.9 mm (Coloma, 1995)

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