174 REMARKS ON THE GENUS PERICROCOTU9. 



of the same species in this sub-division of the Pericrocoti. 

 There is not the same constancy in the sub-groups to which 

 erytkropygius, pereffrinus, &c., belong. 



Until this is recognized, and Javan, Bornean, and Sumatran 

 specimens of this sub-group examined with reference to it, we 

 shall never have the several species which doubtless inhabit these 

 Islands clearly discriminated. 



I may add, too, that it should be borne in mind that in adults 

 of this genus the size of wing varies but little in the same species. 

 Any considerable difference in the size should excite suspicion 

 of specific difference. 



It will now be convenient to review briefly all the species, 14 

 in number, belonging to the genus Pericrocotus, which occur to 

 my knowledge within our limits, both with reference to this 

 and other matters, which should always be noted in discrimina- 

 ting the various species. 



But first I will lay before my reiders a diagnostical table, 

 which will, I hope, enable the least skilful to identify at once 

 any of our 14 species that they may come across, 



With a narrow white or yellowish white 



wing bar ... ... ... (1.) cinereus, or 



? immodestus, nob. 

 "With a conspicuous wing spot. 

 Wing spot, white. 



1. forehead black or brown ... (2.) erythropygius. 



2. forehead white ... ... (3.) albifrons. 



Wing spot colored. 



1. head unglossed grey, greyish 

 brown or dusky ; no bright colour 

 on forehead ; rump never yellow. 



A. Wing, 26 to 29 ; no bright coloured 

 margins to outer webs of tertiaries . x 



and later secondaries near their tips. (,4. J peregl'inUS. 



B. Wing, 32 to 3'53 ; outer webs of 

 tertiaries and later secondaries with . _ . 



rosy margins near tip ... ... \&.J I'OSetlS. 



2. Male — Head blackish dusky with 

 a blue gloss. Female — Head, 

 grey ; no bright colour on fore- 

 head, but rump yellow . . . (6.) solan's. 



3. head, in male glossy black ; in 

 female grey, with orange or 

 yellow on forehead. 



A. No bright colored margins to outer 

 webs of tertiaries and later secondaries 

 near their tips. 



(a). W., 3-4, to 37. Female, chin 



and throat yellowish white or ._ . , . . 



very pale yellow ; rump yellow \< •) DreVIl'OStl'lS. 



