1877.] MR. D. G. ELLIOT ON THE IBIDIN^S. 483 



(1877) Graptocephalus, 'EUiot, gen, noy Geronticus daviso7ii,'H.ume. 



(1877) TkaMmatibis, HUiot, gen. noY 3is ffiffa/itea,Ouat&\&t. 



(1877) Lampribis, Wliot, gen. noY Ibis olivacca, Da Biia. 



KEY TO THE GENERA. 



A. Head, and neck for nearly its entire length naked. 



a. Skull oblong on top ; webs of scapulars decomposed ; 



tarsi and middle toe equal 1. Ibis, 



b. Skull square on top, middle toe three fourths the 



length of tarsus 2. Thaumatibis- 



B. Head and upper part of neck naked. 



a. Skull squui-e on top; occiput sloping to forehead, 

 which descends rapidly to maxilla. Tarsus half an 



inch longer than middle toe ... 3. Graptocephalus . 



b. Skull oblong on top. 



a'. Base of neck covered with stiffened spiny shafts ... 4. Carpkibis, 

 b'. Back of head covered with papillae 5. Inocotis. 



C. Head and throat naked ; occiput projecting beyond the 



line of the neck ; neck feathered behind nearly to the 

 head. 



a. Neck covered with loose, extremely narrow, lengthened 



and pointed feathers ; tail long, rounded 6. Comatibis. 



b. Neckcovered with soft short feathers; tail long, square 7. Geronticus. 



D. Front and sides of head, and throat, naked 8. Phimosus. 



E. Fore part of head on top and face naked ; throat fea- 



thered 9. Nipponia. 



F. Top of head feathered. 



a. Sides ofhead and throat naked ; tail very long, cuneate 10. Cercibis. 



b. Space aroand the eye and Hne on sides of throat naked 11. Theristicus. 



c. Space around the eye bare ; throat covered with long 



feathers ; head crested 12. Lophofibis. 



d. Space between the eye and maxilla bare ; a naked line 



on throat along the lower margin of mandible 13. Hagedashia. 



G. Head and throat feathered. 



a. Bare wattle pendent from the throat 14. Bostrychia. 



b. Narrow line on forehead at base of culmen and space 



between the eye and maxilla bare 15. Harpiprion . 



c. Space between eye and maxilla bare. 



a'. Feathers of the neck long and loose ; thighs fea- 

 thered nearly to the knee 16. Molybdophanes. 



b'. Feathers of the neck short ; thighs bare for nearly 



their entire length 17. FalcincUus. 



H. Forehead and space around and behind the eye naked. 



a. Throat feathered 18. Lampribis. 



b. Throat naked 19. Eudocimios. 



Geographical Distribution. 



The birds composing the subfamily of which this Monograph 

 treats are distributed everywhere throughout the globe, being found 

 in every zoogeographical division yet named ; and if the number of 

 species of a family which exists in any particular portion of the 

 earth is an indication that it there had its origin, then we may con- 

 sider that Ibis appeared first in the eastern hemisphere ; for, of the 

 twenty-five species recognized in this paper, fifteen are found to dwell 

 upon the eastern continents, or on the islands composing the Indian 



31* 



