MELANOTIS POXACOBIUS. 



5t 



Measurement (2G,374). Length, 10.75; wing, 4.S0 ; tail, 5.40; bill from 

 gape, 1.35 ; nostril, .70 ; tarsus, 1.18 ; middle toe and claw, 1.10 ; claw alone, .30. 



(29,355.) Length, 10. Iris brown. (30,135.) Length, 10.50. Iris brown. 



melanotic Iiypoleiacus. 



Mehinotis hypoleucus, H.vrtlacb, R. Z. Oct. 1852, 4*10. — Tb. Jour, f, 

 Ornith. 1853, 30.— Sclatek & Salvix, Ibis, I, 1859, 7 (eggs).— Ib, 

 II, 1860, 29.— ScLAXER, P. Z. S. 1859, 337.— Ib. Catal. 1861, 7, no. 43. 



Hah. Guatemala. 



Total length, 10.00 ; wing, 4.00 ; tail, 4.90 ; difference of tail feathers, 1.25 ; 

 exposed portion of 1st primary, 1.50 ; of 2d, 2.40 ; length of bill from forehead, 

 1.15, from nostril, .68; along gape, 1.32; tarsus, 1.26; middle toe and claw, 

 1.10; claw alone, .30; hind toe and claw, .75 ; claw alone, .37. 



DONACOBIUS, SwAixsoN. 



Donacobius, SwAixsox, Class. Birds, II, 1S31, 236. (Type D. vociferans, 

 Sw. ^ Tardus atricapillus, L.) 



Bill as long as head, notched. Bristles distinct, reaching to nostrils. Nasal 

 groove broad, filled by a plane, tense, naked, thin edged membrane ; the 

 nostrils pervious, occupying the anterior extremity of the groove, bordered 

 behind only by membrane ; broadly oval, the axis rather oblique. A large, bare 

 naked space on each side the neck. Wings shorter than the much graduated 

 tail. First primary about half the longest (fifth) ; 2d shorter than the 

 secondaries. Tail feathers broad ; outer webs of lateral feathers having their 

 outer webs half as wide as the inner. Graduation excessive ; outer feather 

 about half the middle. 



Tarsi little longer than middle toe and claw, with six scutpllre anteriorly 

 fused into a continuous ungrooved plate on the outer side. Claws lengthened, 

 moderately curved. Inner toe cleft to base. 



