281 
51. MusciGRALLa BREVICAUDA, Lafr. et D’Orb. 
One ex. ‘Irides hazel; bill black, base of lower mandible blue ; 
legs and feet flesh-colour. Seen on some dead brushwood by the 
road-side.”’ 
52. MEGARHYNCHUS CHRYSOGASTER, sp. nov. 
Megarhyncho mexicano e¢ M. pitanguze affinis, sed ab utroque 
colore abdominis letissime aureo diversus: quoad rostrum et 
crassitiem his duabus intermedius. 
One ex. A third climatal variety or species, whichever it may be, 
of this genus of Tyrannide, distinguished by its full bright yellow 
belly. The only specimen is not in very good plumage ; but Mr. 
Fraser has since sent another from Esmeraldas. In accordance with 
M. Heine’s views (Cab. Journ. f. Orn. 1859, p. 337), I now employ 
Megarhynchus as a generic name for these birds. But is not this 
species the bird considered by him as Scaphorhynchus chrysocepha- 
lus of Tschudi? Tschudi’s figure is certainly detestable; but his 
species, of which I have specimens collected by Mr. Fraser at Palla- 
tanga, is well marked, and can in no way be considered as a climatal 
variety of M. pitangua. It is more closely allied, in my opinion, to 
Myiodynastes, though, as I have remarked (P. Z. S. 1859, p- 43), 
“leading off towards Scaphorhynchus,” i.e. Megarhynchus. 
53. TyYRANNUS MELANCHOLICUS, Vieill. 
Many ex. 
54. TYRANNUS NIVEIGULARIS, sp. nov. 
Supra cinereus, dorso olivaceo perfuso, capitis crista interne 
flava: loris et regione auriculari nigricanti-cinereis : alis nigris, 
primariis stricte, secundariis et tectricibus late albido limbatis: 
cauda nigra unicolore, rectricum apicibus et harum externarum 
marginibus externis viz albicantibus: caude tectricibus supe- 
rioribus nigris, olivaceo terminatis: subtus pallide flavus, gut- 
ture et collo antico pure albis, hujus lateribus et pectore sum- 
mo cinereo vie lavatis: rostro et pedibus nigris. 
Long. tota 7-0, alee 4-1, caudex 3:1. 
Hab. In rep. Equator. 
Mus. P.L.S. 
One ex. “Trides hazel ; bill and legs black.” 
A species of true Tyrannus, looking to its general structure and 
acuminated primaries, distinguishable by its small size, pure white 
throat and neck, and black tail. The primaries of the single speci- 
men are not fully developed ; but the three first are somewhat ob- 
tusely acuminated, quite as much as in 7’. melancholicus. 
55. My1arRcHUS PHZOCEPHALUS, sp. nov. 
Pallide olivaceus: capite cinereo, pileo summo obscuriore: alis 
Suscescenti-nigris, primariis stricte, tectricibus et secundariis 
latius ochracescente marginatis : subtus pallide flavus, gutture 
