. Ecuadorian frogs of the genus Colostethus (Anura:Dendrobatidae) . Fig. 3. Schematic representation of gular-chest markings in Colostethus. A . Marks on mental region. B . Small spots at base of arm. C. Two discrete dark marks. D. Band-like marks. E. Unspotted throat of male. F. Spotted throat of female. and other scattered marks or short longitudinal stripes in the sacral region. An "X"-shaped mark in the scapular region of dorsum is characteristic of C. machalilla. Usually a black dorsolateral stripe extends from scapular region to the anal region; the stripe may be interrupted or
. Ecuadorian frogs of the genus Colostethus (Anura:Dendrobatidae) . Fig. 3. Schematic representation of gular-chest markings in Colostethus. A . Marks on mental region. B . Small spots at base of arm. C. Two discrete dark marks. D. Band-like marks. E. Unspotted throat of male. F. Spotted throat of female. and other scattered marks or short longitudinal stripes in the sacral region. An "X"-shaped mark in the scapular region of dorsum is characteristic of C. machalilla. Usually a black dorsolateral stripe extends from scapular region to the anal region; the stripe may be interrupted or vary in intensity within populations. In some specimens of Colostethus elachyhistus, C. pulchellus, and C. delatorreae, there are two short, dark paravertebral stripes in the sacral region. A cream vertebral stripe characterizes C. vertebralis and some specimens of C. elachyhistus and C. breviquartus. Most species have dark transverse bars on the fore- and hind limbs. Longitudinal black stripes occur on the anterior surface of the upper arm. Longitudinal black or white stripes are present ante- riorly and posteriorly on the thigh. Usually there also is a short oblique white stripe across the proximodorsal surface of the thigh. This stripe some- times is connected to the oblique lateral stripe ante- riorly and to a white longitudinal stripe on the posterior surface of the thigh. Dorsolateral stripe.—White or cream dorsolat- eral stripes occur in several species. The stripes usually extend from the tip of snout or the occiput along the dorsolateral margin of the body posteri- orly to the cloacal region. In C. nexipus, this stripe is pink and incomplete. Oblique lateral stripe.—Many Ecuadorian Colostethus have a pale cream or white stripe ex- tending along the lateral body from behind the eye to the groin. Several kinds of oblique lateral stripes can be distinguished among the species. In some species (, C. hocagei), the stripe is washed ante- riorly with darker colors so
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