I 



1. HOCCO. 179 



white oggs. Of the mode of nidification of the other memhers of 

 tlio family we arc iit preseub almost entirely igiioraut ; but it is 

 ]iiob:ible that they either follow the same practice, or else nest in 

 lioUow trees, and that their eggs are colourless, like those of other 

 birds which deposit their eggs in similar situ;itiou8. 



Key to the Genera. 



A. Bill straight, widened at the base ; tip 



hooked 1. Bucco, p. 179. 



B. Bill more or less incurved, compressed ; 



tip incurved but not hooked, except in 

 Ilapaloptila. 

 a. Tail longer, rounded. 

 a' . Wings short. 



a". Bill shorter and thicker. 



I Tail moderate 2. Malacoptila, p. 19.3. 



) Tail short '■). Micromgnacha, p. 199. 



h". Bill longer and thinner 4. Nonnula, p. 109. 



//. Wings lengthened. 



(Bin hooked; tail shorter .... 5. Hapaloptila, p. 202. 

 I Bill incurved ; tail longer .... G. Monacha, p. 202. 

 h. 'Vi\\\ shorter, squared ; wings long . . 7. Ohelidopteba, p. 207. 



1. BUCCO. 



Type. 



Bucco, Briiss. Orn. iv. p. 92 (1760) B. collaris. 



Cj-phos, Spix, Av. Bras. i. p. 51 (1824) B. macrodactylus. 



Nystactes, Glo(/er, Frorieps Notizen, xvi. p. 277 



(1827) B. tamatia. 



Tamatia, Less. Tr. d'Orn. p. KiG (1831) B. tectus. 



Chaunornis, Gru;/, List Gen. B. p. 13 (1841) .... B. tamatia. 

 Nystalus, Cab. ct Hein. Mies. Hein. iv. p. 139 



(18G3) B. maculatus. 



Hypnelus, Cab. et Hein. Mus. Hein. iv. p. 143 



(1863) B. bicinctus. 



Nothriscus, Cab. et Hein. Mus. Hein. iv. p. 14G 



(1863) B. tectus. 



Argicus, Cab. et Hein. Mus. Hein. iv. p. 148 



(1863) 13. macrodactylus. 



Notharchus, Cab. et Hein. Mm. Hein. iv. p. 149 



(18G3) B. hyperrhynchus. 



This extensive genus, wiiieh is spread over the whole area of the 

 family, is divisible, according to the shape of the bill, into two sub- 

 genera, Biaro and Ni/stalns. It contains 20 species, which may be 

 arranged as follows ; — 



Key to the Species. 



A. Bill rounded, dilated at the base. {Bucco.) 

 a. With a distinct breast-band. 



a'. Rufous and white ; bill vd 1. colbiri.i, p. 160. 



n2 



