MYIAECHrS. 89 



The series includes several specimens in fresh plumage and others in full moult ; 

 the former shot in October, the latter in August 1888. A young example has a great 

 deal of rufous colouring on the tail, the shaft and a small portion of the webs on 

 either side being fuscous. In the adults the proportion of rufous is much as in 

 M. crinitus, and that colour runs out to the tip of the lateral tail-feathers. They thus 

 differ from typical M. cinerascens, and also in their yellower abdomen and more 

 olivaceous mantle. 



This species appears to be not uncommon in the State of Guerrero, and ranges from 

 the sea-level at Acapulco to an altitude of 4.600 feet at Chilpancingo. 



3. Myiarchus magister. 



Tyrannula cooperi, Kaup, P. Z. S. 1851, p. 51 (nee Nuttall) \ 



Myiarchus cooperi, Baird, B. N. Am. p. 180 ' ; Scl. P. Z. S. 1859, p. 384 ' ; Scl. & Salv. Ibis, 1859, 



p. 122 * ; P. Z. S. 1870, p. 837 ' ; Lawr. Ann. Lye. N. Y. ix. p. 202 \ 

 Myiarchus crinitus var. cooperi, Coues, Pr. Ac. Phil. 1872, p. 67 ' ; Baird, Brew., & Ridgw. N. Am. 



B. ii. p. 331 ' ; Lawr. Bull. U. S. Nat. Mus. no. 4, p. 28 ^ 

 Myiarchus erythrocerctis var. cooperi, Ridgw. Pr. U. S. Nat. Mus. i. p. 138 ". 

 Myiarchus crinitus erythrocercus, Coues & Sennett, Bull. U. S. Gaol. Surv. iv. p. 32"; Sennett, 



Bull. U. S. Geol. Surv. v. p. 402 '' ; Coues, Key N. Am. B. ed. 2, p. 435 ". 

 Myiarchus mexicanus. Dresser, Ibis, 1865, p. 473'"; Sumichrast, Mem. Bost. Soc. N. H. i. 



p. 557 " ; Grayson, Pr. Bost. Soc. N. H. xiv. p. 278 " ; Lawr. Mem. Bost. Soc. N. H. ii. 



p. 287 " ; Ridgw. Pr. U. S. Nat. Mus. iii. p. 13 '' ; Man. N. Am. B. p. 333 " j Sel. Cat. Birds 



Brit. Mus. xiv. p. 250 ". 

 Myiarchus mexicanus magister, Ridgw. Pr. Biol. Soc. Wash. ii. p. 90 ^' ; Man. N. Am. B. 



p. 333 ". 



Supra paLide olivaoeo-brunneus, oapite summo paulo brunnescentiore ; uropygio rufesoente tincto ; aHs nigri- 

 cantibus interne rufo marginatis, tectricibus et seoundariis internis sordide albo extrorsnm limbatis, 

 remigibus medialiter extrorsum rufo marginatis; cauda nigricante, rectricibus (prseter duas medias) in 

 pogonio interne late rufo marginatis, parte rbacMdi proxima nigricante, reotrice extima utrinque in pogonio 

 externo pro dimidio proximo albido limbata ; loris, cervicis lateribus et corpore subtus usque ad pectus 

 cinereis ; abdomine et subalaribus pallide sulphureis : rostro et pedibus nigricantibus. Long, tota 8-5, 

 alse 4'3, caudse 3-9, tarsi 0"9, rostri a rictu 1*1. (Descr. maris ex Vera Cruz, Mexico. Mus. nostr.) 



Hob. NoBTH America, Southern Arizona ^2 and Texas ^4. — Mexico, Ysleta in Sonora 

 ( W. Lloyd), Mazatlan, Tres Marias Is. ^^ ( Grayson, Forrer), Ceralvo, Hacienda de 

 los Trevinos, Vaqueria, Hacienda de las Escobas, Villa Grande, Rio de la Silla, Topo 

 Chico, Estancia [F. B. Armstrong), Sierra Madre above Ciudad Victoria, Soto la 

 Marina, Tampico ( W. B. Richardson), Vera Cruz (F. T). 0. & W. B. Bichardson), 

 Teapa {Mrs. H. H. Smith), Peto, Buctzotz, Cozumel I. {G. F. Gawmer) ; Bkitish 

 HoNDUKAS, Cayo (Blancaneaux), Orange Walk (G. F. Gawmer) ; Guatemala 

 (SMnner^) ; Honduras, Ruatan I. {G. F. Gaumer), San Pedro {G. M. Whitely^). 



This species is involved in considerable difficulty both as to its limits and as to its 

 proper title. Putting the South-American species aside, Mr. Ridgway, in his recent 

 BIOL. CENTK.-AMBE., Aves, Vol. II., March 1889. 12 



