THETOTHORUS. 93 



bird recently described by Taczanowski as T. sclateri, and is probably inseparable from 

 that species. 



Guatemalan specimens exhibit considerable diversity in the number of the black 

 spots of the under plumage, some having the throat pure white, which in others is 

 spotted like the breast. The example from Northern Yucatan shows the greatest 

 divergence, being of a much greyer cast of plumage above, especially on the tail. 



B. Thetothoeus. 



Uropygium maculis celatis alhis notatum. 



c. nostrum mediocre. 



5. Thryothoms felix. (Tab. vil. fig. l.) 



Thryothorus felix, Scl. P.Z.S. 1859, p. 371'; Lawr. Mem. Bost. Soc. N. H. ii. p. 268' (partim). 

 Pheugopedius felix, Baird, Rev. Am. B. i. p. 136 ^ 



Supra murino-fuscus, pileo antico rufo ; loris et capitis lateribus albo nigroque striatis ; alis dorso concoloribus, 

 Cauda nigricanti regulariter transfasciata ; Bubtiis cinuamomeo-rufescens, ventre medio albic*nte, gutture 

 albo, crisso albo nigro transfasoiato ; rostri maxiUa nigricante, mandibula et pedibus plumbeis. Long, 

 tota 6-5, alse 2-4, caudae 2-6, rostri a rictu 0"9, tarsi 0"95. (Descr. exempl. ex Oaxaca, Mexico. Mus. nostr.) 



Hob. Mexico, Mazatlan {Grayson^), Juquila (Boucard ^). 



M. Boucard discovered this Wren in May 1859 in the Mexican State of Oaxaca ^ ; 

 and it has since been traced as far north as Mazatlan ^, one of M. Boucard's specimens 

 having been compared with another from the latter place, and pronounced by Prof. 

 Baird to agree in all essential respects ^. 



Nothing is recorded of the habits of this Wren ; but it may be assumed to resemble 

 in this respect the following species, as Grayson's note on T. lawrencii was made under 

 the supposition that the birds of the Tres Marias Islands and Mazatlan were identical, 

 which is now proved to be not absolutely the case. We have figured one of Boucard's 

 Oaxaca specimens, the same as the one which furnished Prof Baird with his description 

 of the species in the ' Eeview of American Birds ' ^- 



6. Thryothorus lawrencii. 



Thryothorus felix /3. lawrencii, Ridgw. Bull. Nutt. Om. Club, 1878, p. 10'; Salv. Ibis, 1878, p. 196'. 

 Thryothorus felix, Grayson, Pr. Bost. Soc. N. H. xiv. p. 278' (nee Sclater). 



T. felici affinis, sed oorpore subtus fere albo, h)rpochondriis vix rufescenti tinctis differt ; supercUiis distinctis 

 albis, genis immaculatis albis, et rostro graciliore magis incurve quoque diversus. Long, tota 5-3, alae 

 2-3, caudae 2-2, rostri a rictu 0-95, tarsi 0-9. (Descr. exempl. typ. ex inss. Tres Marias, Mexico. U.S. 

 Nat. Mus. no. 50818.) 



Eab. Mexico, Tres Marias Islands (Grayson ^ ^). 



Grayson ^ describes this Wren as a little larger than the one of the mainland, but 

 with similar notes. He adds that it is very common in the Marias, where it is a 



