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Show 1883] GECKOS OF NEW CALEDONIA. 127 I may relate how the confusion took place:- Overlooking Bocage's description, I renamed the species in 1878 Chamceleonurus trachycephalus. Shortly afterwards, Sauvage re-described it as Platydactylus chahoua, Bavay, which it is not, treating Rhacodactylus trachyrhynchus, Bocage, as a synonym. The following year I published a note in which I referred my C. trachycephalus to R. trachyrhynchus and P. chahoua, having been informed by Dr. Sauvage that the three forms were identical. At that time I had not at hand Bavay's excellent monograph, which had been lent to me on the former occasion by M . Lataste, and was not able to reconsult the original description of P. chahoua; but believing Dr. Sauvage to have examined authenticated specimens, I did not think there was any reason for suspecting the accuracy of bis statement. I vvas afterwards informed by Dr. Sauvage that the Paris specimens had simply been compared with Bavay's description ; and as the latter is not at all applicable to R. trachyrhynchus, I came to the conclusion that this and R. chahoua were distinct species. This was confirmed by the examination of M . Bavay's typical specimen. 11. RHACODACTYLUS AURICULATUS. Platydactylus auriculatus, Bavay, Cat. p. 6. * Ceratolophus hexaceros, Bocage, Jorn. Soc. Lisb. 1873, p. 205. *Platydactylus (Ceratolophus) auriculatus, Sauvage, Bull. Soc. Philom. (7) iii. p. 67. * Ceratolophus auriculatus, Bocage, Jorn. Sc. Lisb. 1881, p. 130. Head subpyramidal; snout longer than the distance between the orbit and the ear-opening, once and two thirds the diameter of the orbit, slightly swollen at the end ; interorbital space and forehead deeply concave ; hinder part of head with knob-like prominences, viz. one above the ear-opening, formed by the free end of the quadrate, and five others formed by tbe extremities of the parietal bones ; the borders and sutures of the latter forming prominent ridges ; the ends of the postfrontal bones and mandible also prominent; ear-opening large, oval, oblique. Body and limbs moderately elongate, rather depressed ; digits not very broadly dilated, not very unequal, with a very slight rudiment of web, which is altogether absent between the two outer toes. Throat and sides of neck with a few irregular folds ; a slight fold bordering the hind limb posteriorly. Head and body covered with subequal small granular scales, flattened ou the belly, smallest on the throat. Rostral quadrangular, not quite twice as broad as high, with a small notch in the middle of its upper border; nostril pierced between the rostral, the first upper labial and seven small nasals, the anterior being much the largest; 16 to 18 upper, and 14 or 15 lower labials; mental small, subtri-angular, separating the inner labials ; no regular chin-shields, but larger scales passing gradually into the granules of the throat. Tail cylindrical, covered with uniform small juxtaposed scales arranged in verticils. Male with an irregular patch of very numerous preeanal pores, and a sort of pouch in the integument of tbe thigh posteriorly, near the tibia. Yellowish-grey, with darker and lighter longitudinal |