48 



ALTRICIAI, (JitAM-AToKKS- limtODlUNKd. 



Gknis BUTORIDES, 1!i-ytii. 



lUiluriiliS, "Bi.YTii, 1810," UnNAi'. C'lMLsp. II. lS5r., I'JS (tjin', .h;l,u juvaiiku, lIoiiSF.). 

 Uniseii.i, t'AUAN. J. f. O. IV. 165(5, 343 (tyiir, Ankit vinncenn, Linn.). 



Gen. CiiAii. Small IIltoii'*, uttlaikisli, iikhv or less viiiif^atid, lolors, tlie iiik-um and oocipul 

 m-atiMl. lilll' ratliiT stcmt, ili'Litk'tlly Uiw^'V lliaii llif Uikw. Mental a| I'X iva.iiin^,' lo a little 

 k'SH than halt' way (in />. ^nnni.sci /i.i exarlly hall' way) lioni the middle of the eye to the iioint ul' 

 the hill, anil to deeidedly heyond the anterior end of the nostril ; mnLir ajiex about uvun with thu 

 I'rontal, and deeidedly iiosdrior to the hinder end of the no.-tvil (in /.'. hniiitiim-ni.i this iioint falls 

 eonsiderahly short of the frontal one). Middle toe very nearly oi unite eiiual to the tarsus (etjual 

 to it in n. jiimnicits, a little shorter in the Amerieun forms, the dill'erence bein;; most nnuked in 

 H.vimcem); outer tue scarcely or not at all lon^,'er than the inner (except in IJ. bruiuiesccns) ; 



«|i('i le 

 may 1 1 



llle ill 



('ill 



wllill' 



i'iiii^|ili| 

 iii<li~lifl 



.4. N| 



B. virescena. 



hallux about half the lenjjth of the middle toe ; bare portiou of tibia eriual to or shorter than the 

 hallux. 



Pileuni with a full crest of broadly lanceolate, compact-webbed feathers, these longer and more 

 narrowly lanceidate on the occiput. Scapulars and interscajmlars elongated and lanceolate in the 

 adult, but not reaching the end of the tail (very much as in Anhit). 



It will be (d)served, from the terms of the above diagnosis, that the spccie.s of this genus vary 

 somewhat in tln^ minor details of external form ; the diti'erences aie so slight, however, that they 

 are evidently of not more than sjtecilic importance. As stated above, li.javniiiai dilfers from the 

 American species in the contour of the bill, the culmen being slightly dei>ressed about the middle 

 portion, as in IHchromanassa riifu. It should also Ije noted, however, that the several American 



* There is a decided (liU'ercncc in the form of the bill lietwoen the type of this gemis, Ardca jnvnnica, 

 IIoiisFiui.n, and the four American sjiecies, it being in the former abnost exactly as m Dichromnnassn 

 riifa, in nil its outlines and i)roportions, uUlumgh it is, of course, very mncli smaller. All the other char- 

 acters, however, even the system of coloratimi, corresiioiid so entirely with those of the Amerienn foniis 

 that the latter nmy lie all considered typicid. The jjeneric cliaraeters are therefore nioililicd, as to the bill, 

 so as to include all. S. jKitrwNs, 1'kalk, fiom Tahiti, is cpiite similar in form to //. juvanica. 



