. Ecuadorian frogs of the genus Colostethus (Anura:Dendrobatidae). Colostethus. 10 UNIV. KANSAS NAT. HIST. MUS. MISC. PUBL. NO. 87. Fig. 5. Testes of (A) Colostethus chocoensis (MNHG 19107), and (B) (KU 182105), showing differences in size. Line equals 5 mm. the oblique lateral stripe occurs in C. nexipus, in which the stripe may be absent, interrupted, or continuous, and connected or not with the dorsolat- eral stripe. Ventrolateral stripe.—This white or cream stripe usually extends from the axilla to the groin. In some species, it is continuous with a cream labial stripe. It is
. Ecuadorian frogs of the genus Colostethus (Anura:Dendrobatidae). Colostethus. 10 UNIV. KANSAS NAT. HIST. MUS. MISC. PUBL. NO. 87. Fig. 5. Testes of (A) Colostethus chocoensis (MNHG 19107), and (B) (KU 182105), showing differences in size. Line equals 5 mm. the oblique lateral stripe occurs in C. nexipus, in which the stripe may be absent, interrupted, or continuous, and connected or not with the dorsolat- eral stripe. Ventrolateral stripe.—This white or cream stripe usually extends from the axilla to the groin. In some species, it is continuous with a cream labial stripe. It is complete or incomplete, with variation occurring within and among populations. This stripe is barely visible in some preserved specimens. In some spe- cies (, some populations of C. awa), it is continu- ous with the lateral and/or ventral color. The ventro- lateral stripe is most conspicuous in species having a dark venter; however, it also occurs in species with immaculate venters, such as C. marchesianus and C. toachi. Markings on gular-chest region.—Dark marks in the gular-chest region characterize many Ecua- dorian Colostethus (Fig. 3). These marks may be irregularly distributed and continuous with mark- ings on the abdomen or throat or restricted to the gular and chest region. The dark marks may form a diffuse band (C. bocagei), a white-spotted band (C. awa, and C. infraguttatus), two large spots (C. elachyhistus), or two small spots (C. vertebralis, C. pulchellus, and C. shuar). Ontogenetic changes oc- cur in this character, with some species having white-spotted bands as adults but completely dark bands as juveniles. Colostethus delatorreae and C. maquipucuna have two small black spots ventrally on the lateral part of the chest at the level of the insertion of the arm (Figs. 3B, 4). Ventral coloration.—Ventral coloration varies inter- and intraspecifically. Interspecific variation ranges from immaculate venters, cream, yellow, orange, red, to black washes, hea
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