Mr. P. L. Sclater on the American Barbels. 185 



The most noticeable points about the Tetragonops are the 

 singular conformation of the bill (the lower mandible being 

 distinctly bifurcated at its extremity, and the point of the upper 

 fitting into the groove thus made), and the abnormal distri- 

 bution of the colours, which strongly reminds one of some of 

 the Toucans of the genus Andigena. 



Genus II. Capito. 



Capita, Vieill. Analyse, p. 27 (1816). 



Micropogon, Temm. Tabl. Meth. d. PI. Col. p. 55 (1838). 



Nyctades, Gloger, Obs. s. noms d'Ois. (1827). 



Rostro compresso, ad basin dilatato, culmine inter nares ele- 

 vato : mandibula subrecta, apice acuto ; maxilla incurva, apice 

 ultra mandibulam breviter protenso. 



Sectio a. Capito. 

 Majores : robustiores. 



1. Capito erythrocephalus. 



Barhu de Cayenne, Buff. PI. Enl. 206. fig. 1, unde Bucco ery- 

 throcephalus, Bodd., et B. cayennensis, Gm. S. N. i. p. 405 : 

 Micropogon cayennensis, Temm.: Capito erythrocej)halus. Gray, 

 Gen. ii. p. 430 (adult.). 



Barhu de S. Domingue, Buff. PI. Enl. 206. fig. 2, unde Bucco 

 cayennensis, var., Gm. S. N. i. p. 405: Micropogon navius, Temm.: 

 Capito navius, Gray, Gen. ii. p. 430 (juv.). 



Capito cayennensis, Schomb. Guian. iii. p. 720 : Le Barhu de 

 la Guyane, Le Vail, Ois. de Par. ii. pis. 23, 24, 25. 



Niger, sulphureo variegatus : alis et cauda fuscis, extus virescen- 

 tibus : pileo flavicante, fronte lato et gutture rubro-coccineis : 

 abdomine pallide sulphureo : lateribus nigro obsolete macu- 

 latis : pectore et lateribus totis in juvene nigro distincte gut- 

 tatis: long, tota 6"5, alee 3*1, caudse 2'0. 



Hah. Guiana. 



Mus, Brit., P.L.S. 



There is no doubt now, we believe, that the Capito navius is 

 merely the young of Capito erythrocephalus, and that the spots 

 gradually disappear, in the manner pointed out by MM. Deville 

 and Des Murs in their article upon the following species, leaving 

 the abdomen pure and unspotted in the adult bird. 



VOL. III. o 



