228 KORMlCAKIIU.li:. 



r,s. cf $ ad. sk. Rio Napo, Ecuador. Pclater Coll. 



t. 2 atl- i'k- l^i*^ Najio, Ecuador. Purchased. 



«<, V. d 2 a-d. ; Sarayacu, Ecuador {Buckley). Salvin-Godman Coll. 



w. d ji"- sli. 



X. 5 ad. sk. Bogota. Pui'chased. 



Subfamily II. FORMIC ARIIN^. 



Under this heading I now place all the genera referred to the 

 subfamily Formicivorince in my ' Synopsis of the Ant-birds,' as well 

 as the typical Formicariince, referring the long-legged GraUarue to a 

 separate subfamily. The For}nicani)ue, as thus constituted, comprise 

 all the smaller and more delicately built members of the group, as 

 well as some genera of larger size and Thrush-like aspect. Their 

 smaller points of structure vary exceedingly, even among allied 

 species, and I find it at present quite impossible to draw satisfactory 

 characters for the generic divisions, which under these circumstances 

 I have left in nearly the same state as in the ' Nomenclator.' 



The Fonnicariinai are spread all over the area occupied by the 

 family, but are most abundant in the tropical forest-districts of the 

 Xeotropical Ilegion. 



Key to the Genera *. 



A. Of small size : bill weak. 



a. Bill not longer than head. 

 «'. Tarsi short, thicker, scutated. 



a". Tail much shortened 11. Mybmotherula, p. 229. 



h". Tail moderate or lengthened. 



a'". Bill rather thicker 12. Herpsilochmus, p. 244. 



b'". Bill moderate 13. Eohmicivoea, p. 248. 



c" . Bill thill 14. Teeenura, p. 257. 



h'. Tarsi long, thin, smooth 15. Psilorhamphus, p. 259. 



h. Bill longer than the head 16. Rhamphoc^nus, p. 200. 



B. Of medium size : hill stronger; plumage 



mostly black and grey. 

 c. Tarsal scutes manifest. 



a'. Bill shorter 17. Cercomacea, p. 26.3. 



h' . Bill longer. 



a" . Bill much compressed 18. Pybiglena, p. 269. 



b" . Bill wider at the base. 



( Lores naked 19. Gymnocichla, p. 271. 



I Lores feathered 20. Percnostola, p. 272. 



(1. Tarsal scutes obsolete. 



c. Tarsi quite smooth 21. irETEEOCNEMis, p. 274. 



d'. Tarsi nearly smooth. 



c". Bill as long as head 22. Myrmeciza, p. 277. 



d". Bill shorter than head. 



a". Bill broader 23. IIypocnemis, p. 284. 



* Eefer also to : — 



Myrmochanes hypoleucus, Allen, Bull. A. M. N. H. ii. p. 95 (Bolivia). 



