78 TEOaLODTTIDiE. 



Prof. Baird, and lastly to a separate genus, Vropsila. This bird has a resemblance to 

 Henicorhina in the proportions of its wings and tail, as well as its general coloration ; 

 but instead of the open nostril of the members of that genus, the nasal opening is 

 overhung by a membrane just as in Thryothorus. As it also has a compressed lengthened 

 bill and short tail, it may be conveniently placed next to Microcerculus. 



The single species U. leucogastra is only known as an inhabitant of Southern Mexico. 



1. Uropsila leucogastra. 



Troglodytes leucogastra, Gould, P. Z. S. 1836, p. 89 \ 



Uropsila leucogastra, Scl. & Salv. Nomencl. Av. Neotr. pp. 7, 155 ". 



Cyphorhims pusillus, Scl. P. Z. S. 1859, p. 372'. 



Heterorhina pusilla, Baird, Rev. Am. B. i. p. 119*. 



Murino-brunnea, loris efc superciliis posticis albis ; secundariis extus et cauda nigro obBolete transfasciatis ; 

 regione auriculari albo variegata ; siibtus alba lateraliter cinerascenti tincta, hypoobondriis, ventre imo et 

 crisso pallida brunneis ; rostri maxiUa plumbea, mandibula albida ; pedibus pallide corylinis. Long, tota 

 3-5, al£e 1-75, caudse 1-1, tarsi 0-75, rostri a rictu 0-7. (Desor. exempl. ex Mexico. Mus. P. L. Sclater.) 



Edb. Mexico, Tamaulipas (fide Gould ^), Playa Vicente {Boucard ^). 



Of this smaU species but little is known. Mr. Gould's description of a bird from 

 Tamaulipas was long unrecognized or misapplied to the Mexican race of Thryothorus 

 hewicJci; and it was not until 1873 that its right title was restored to it 2, Mr. Sclater having 

 in the meantime redescribed the species in 1859 under the name of Cyphorhinus pusillus ^. 

 When describing C. pusillus Mr. Sclater had four specimens before him, all from Playa 

 Vicente, on the eastern side of the mountains of Oaxaca. One of these seems to have 

 come afterwards into the possession of the Smithsonion Institution ^. Besides these we 

 have a single specimen said to be from Mexico, but without exact locality. A sixth is 

 Mr. Gould's type, the fate of which is not known. These, so far as we are aware, are 

 all the specimens that have been obtained up to the present time. 



HENICOEHINA. 



Heterorhina, Baird, Rev. Am. B. i. p. 115 (1864) (nee Westwood, 1845, Coleop.). (Type Scytalopus 



prostheleucus, Scl., = Cyphorhinus leucostictus. Cab.) 

 Henicorhina, Sclater & Salvin, P. Z. S' 1868, p. 170, vice Heterorhina, Baird. 



Prof. Baird first separated this small genus of Wrens from Cyphorhinus, with which its 

 species had been perhaps more frequently associated than with any other ; but the name 

 chosen by him having been unfortunately previously used, Henicorhina was substituted 

 for it in 1868. The open nostril lying at the anterior extremity of the nasal fossa, 

 without any trace of an operculum, removes the genus at once from Cyphorhinus and 

 also from Microcerculus and Thryothorus,. and places it close to Thryophilus, in which 

 genus the form of the nostril is quite similar. The very short tail, hardly exceeding 



