MYIARCHUS. 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 
MM. crinitus, and that colour runs out to the tip of the lateral tail-feathers. They thus 
differ from typical Mf. 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 4600 feet at Chilpancingo. 
3. Myiarchus magister. 
Tyrannula cooperi, Kaup, P.Z.S. 1851, p. 51 (nec 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. Lyc. N. Y. ix. p. 202°. 
Myjiarchus 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 erythrocercus var. cooperi, Ridgw. Pr. U. 8. Nat. Mus. i. p. 188 ”. 
Myiarchus crinitus erythrocercus, Coues & Sennett, Bull. U. 8S. Geol. Surv. iv. p. 32”; Sennett, 
Bull. U. 8S. Geol. Surv. v. p. 402 *; Coues, Key N. Am. B. ed. 2, p. 435”. 
Myjiarchus 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- 2877"; Ridgw. Pr. U.S. Nat. Mus. ili. p. 13°; Man. N. Am. B. p. 833; Scl. Cat. Birds 
Brit. Mus. xiv. p. 250°. 
Myjiarchus mexicanus magister, Ridgw. Pr. Biol. Soc. Wash. ii. p. 90"; Man. N. Am. B. 
p. 333 ”. 
Supra pallide olivaceo-brunneus, capite summo paulo brunnescentiore ; uropygio rufescente tincto; alis nigri- 
cantibus interne rufo marginatis, tectricibus et secundariis internis sordide albo extrorsum limbatis, 
remigibus medialiter extrorsum rufo marginatis; cauda nigricante, rectricibus (preter duas medias) in 
pogonio interno late rufo marginatis, parte rhachidi proxima nigricante, rectrice 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, 
alee 4°3, caudee 3:9, tarsi 0°9, rostri a rictu 1-1. (Descr. maris ex Vera Cruz, Mexico. Mus. nostr.) 
Hab. Nortu America, Southern Arizona 22 and Texas !4.—Mexico, Ysleta in Sonora 
(W. Lloyd), Mazatlan, Tres Marias Is.'° (Grayson, Forrer), Ceralvo, Hacienda de 
los Trevifios, Vaqueria, Hacienda de las Escobas, Villa Grande, Rio de la Silla, Topo 
Chico, Estancia (/. B. Armstrong), Sierra Madre above Ciudad Victoria, Soto la 
Marina, Tampico (W. B. Richardson), Vera Cruz (F. D. G. & W. B. Richardson), 
Teapa (Mrs. H. H. Smith), Peto, Buctzotz, Cozumel I. (G. F. Gaumer) ; Britisu 
Honpuras, Cayo (Blancaneaux), Orange Walk (G. F. Gaumer); Guatemata 
(Skinner +); Honpuras, 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. CENTR.-AMER., Aves, Vol. ITI., March 1889. 12 
