TYRANNISCUS. 33 
besides being devoid of an occipital crest, it has a shorter, wider bill, and more fully 
developed rictal bristles. The tail is normal, not short as in Zyrannulus semifiavus. 
The range of Tyranniscus extends over most of Tropical America as far north as 
Guatemala, where TZ. vilissimus occurs, its place being taken in Costa Rica and the 
State of Panama by 7. parvus, the two constituting the only representatives of the 
genus within our border. 
1. Tyranniscus vilissimus. 
Elainia vilissima, Scl. & Salv. Ibis, 1859, p. 122, t. 4. f. 1°; Salv. Ibis, 1860, p. 194°. 
Tyranniscus vilissimus, Scl. Cat. Am. B. p. 216°; Cat. Birds Brit. Mus. xiv. p. 132*; Scl. & Salv. 
P. Z. S. 1870, p. 843°. 
Olivaceus; pileo nigricanti-cinereo; fronte et superciliis albis; alis fusco-nigris, tectricibus majoribus, secun- 
dariis et primariis secunda, tertia, quarta et quinta ad basin viridi-flavo extrorsum anguste limbatis ; 
cauda fusco-nigricante olivaceo marginata: subtus cinerascens; abdomine toto viridi-flavicante, medialiter 
pallidiore; hypochondriis olivaceo substriatis: rostro nigricante, mandibula pallidiore; pedibus nigri- 
cantibus. Long. tota 4°7, alee 2:35, caude 2:0, rostri a rictu 0-4, tarsi 0°65. (Descr. maris ex Volcan de 
Fuego, Guatemala. Mus. nostr.) 
Q@ mari similis, sed (ut videtur) minor. 
Hab. Guaremata (Skinner +), Duefias, Calderas, Tactic, Choctum (0. S. & F. D. G.), 
Coban (0. 8.2); Honpuras, San Pedro (G. ME. Whitely *). 
This species, though also found in the low forest-country near Choctum, is very 
common in the neighbourhood of Coban at an altitude of about 4000 feet, and many 
specimens were brought us by the Indian boys of that town killed by their blow-guns *. 
T. vilissimus frequents the margins of the forest-clearings and the hedgerows dividing 
gardens or fields. Near Duefias it is more rare than at Coban, but we obtained several 
specimens from the woods clothing the Volcan de Fuego up to an elevation of 7000 feet 
above the sea-level. 
T. vilissimus is included both by Mr. Lawrence and Mr. Zeledon in their lists of 
Costa Rican birds, but, from specimens in our possession from that country, 7. parvus is 
the Tyranniscus of this form that is found there. This view is confirmed by a specimen 
from Angostura sent us by Baird as T. vilissimus, but which is undoubtedly 7’. parvus. 
2. Tyranniscus parvus. 
Tyranniscus parvus, Lawyr. Ibis, 1862, p.12*; Ann. Lye. N. Y. vii. p. 473°; Sel. & Salv. P. Z.S. 
1864, p. 359°, 1870, p. 843‘; Salv. P. Z. S. 1867, p. 147°, 1870, p. 197°; Scl. Cat. Birds 
Brit. Mus. xiv. p. 1827. 
Tyranniscus vilissimus, Lawr. Ann. Lyc. N. Y. ix. p. 111°. 
Precedenti similis, sed multo minor; corpore subtus albicante, hypochondriis et crisso tantum olivaceo tinctis 
distinguendus. (Descr. exempl. ex Panama. Mus. nostr.) 
Hab. Costa Rica, Turrialba (Arcé*), Angostura, Dota, Turrialba, and Barranca 
(Carmiol®); Panama}, Chiriqui °, Bugaba °, Calovevora °, Boquete de Chitra ®, Santa 
Fé5 (Arcé), Lion Hill (M*Leannan 1? °), 
BIOL. CENTR.-AMER., Aves, Vol. II., December 1888. 5 
