56. RHYNCHOCYCLUS. 165 



56. RHYNCHOCYCLUS. 



Type. 



Cyclorhynchus, Sund. Vet.-Ak. Handl. 1835, p. 83 



(1836) R. olivaceus. 



Rhynchocyclus, Cab. et Hein. Mus. Hein. ii. p. 56 

 (1859) R. flaviventer. 



Rainphotrigon, Bp. (1854)* R. ruficauda. 



In the typical species of Rlajnchocyclus, the much widened and 

 swollen bill is a very characteristic feature, but, as will be seen on 

 examination of R. Jlaviventris, this structure becomes much modified 

 towards the end of the series. The tarsi are rather feeble and the 

 wings rather short. 



Rhynchocyclus inhabits the forests of the Neotropical Region 

 from 8. Mexico to S. Brazil and Bolivia. 



Key to the Species. 



A. "Wings and tail olivaceous. 

 a. Bill much widened at base. 



a'. Breast olive. 



Bill longer 1. olivaceus, p. 165. 



Bill intermediate 2. aquinoctialis, p. 166. 



Bill shorter 3. brevirostris, p. 166. 



b'. Breast fulvous 4. fulvipectus, p. 167. 



/;. Bill moderately wide. 

 c'. Breast yellowish. 



I Head lighter 5. sulphurescens , p. 168. 



I Head darker 6. peruvianas, p. 169. 



d'. Breast ashy 7. cinereiceps, p. 169. 



c. Bill more constricted. 

 e'. Cap cinereous. 



j Throat greyish 8. megacephalm, p. 170. 



I Throat olivaceous 9. poliocephalus, p. 171. 



f . Cap olive like back. 



j Belly yellow 10. viridiceps, p. 171. 



j Belly orange-yellow 11. Jlaviventris, p. 171. 



B. "Wings and tail rufous 12. rufcauda, p. 172. 



1. Rhynchocyclus olivaceus. 



Platvrhynchus olivaceus, Temm. PI. Col. 12. fig. 1 ; Max. Beitr. hi. 



p. "969. 

 Todus olivaceus, Licht. Doitbl. p. 51. 

 Cyclorhynchus olivaceus, Cab. Wiegm. Arch. 1847, i. p. 248 ; Bum. 



Syst. Ueb. ii. p. 503. 

 Rhvnchocvclus olivaceus, Cab. et Hein. Mus. Hein. ii. p. 5G ; Scl. 



Cat. A. B. p. 220; Teh. Orn. Bras. p. 109; Scl. et Salt: Nomencl. 



p. 49. 



Above olive-green ; wings and tail dark brown ; wing-coverts 

 margined with fulvous ; wing- and tail-feathers narrowly edged 

 with olive-green : beneath cinereous olive ; middle of belly and under 



* Cf. Gray, Handl. i. p. 354. 



