PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 335 



able doubt that I refer it to TrogJodijies at all, and I do so only because 

 I do not know where else to i^lace it, while I am reluctant to institute a 

 new genus for its special reception. Comparing it with specimens of 

 typical Troglodytes ( T. ai'don, T. furvus, T. tessdatus^ T. hrunneicollis, 

 &c.), Anorthura troglodytes, and Uropsila leucogastra, I find that it agrees 

 best with the latter in j)attern of coloration and in general form, but 

 the wing is much less rounded, the tarsi shorter, and the nostrils very 

 difterent; tliose of TJroi)slla being (in the specimen before me) broadly 

 oval, with very little membrane above them, while the present bird has 

 a narrow, longitudinal or slit-like nostril overhung by a broad scale. I 

 am inclined to believe, however, tliat extreme caution is necessary in 

 using the shape of the nostril in dried skins as a generic character, since 

 its external appearance is so easily modified by accidental circumstances 

 attending the j)reparation of a specimen. For the present, therefore, I 

 refer the species to Troglodytes, and leave further consideration of the 

 question of its generic relationship in abeyance. 



As to the coloration of this species, it is most like T. hrunneicollis, but 

 the tint which prevails over the entire lower parts and the greater part 

 of the head in T. ochraceus is decidedly brighter and more yellowish 

 than the light rufous color of T. hrunneicollis, which, moreover, has this 

 color restricted to the throat, juguliim, and breast. Furthermore, in 

 T. ochraceus there is not the slightest indication of bars or other mark- 

 ings on the sides or flanks. 



Genus ACANTHIDOPS, nobis. 



('AAC^n^tf, iihg ^ Acanihis, and (orp=facies.) 



Gen. ch. — Most nearly related to Automolus, Placellodromus, and 

 allied genera in structure of the feet, &c., but very different in form of 

 bill, and other characters. Bill about as long as the middle toe, cuue- 

 ate in all its profiles, somewhat swollen basally, the culmen and lateral 

 outlines decidedly concave in the middle i^ortion; mandibular tomia 

 very strongly inflexed, with a prominent angle near the base, anterior 

 to which the edge is decidedly concave ; maxillary tomia with a decided 

 notch near the base, immediately above the mandibular angle; gonys 

 very long (about equal to the exposed portion of the culmen) ; nostrils 

 exposed, small, longitudinal, occupying less than the loAver half of the 

 nasal fosste. Tarsus a little longer than the middle toe and claw, divided 

 into about six plates, but these entirely fused on the outer side, except 

 the lower one, which is distinct ; lateral toes equal, the i)oints of their 

 claws falling short of the base of the middle claw ; inner toe entirely 

 separated at the base from the middle toe, and outer with only its first 

 phalanx united; hallux about equal in length to the lateral toes, but 

 much stronger, its claw decidedly larger than that of the middle toe. 



