BIRDS OF THE ANAMBA ISLANDS. 25 
tridactylus tridactylus. The deeper shade of the pileum and cervix 
is not wholly constant, but is easily seen in a series. We have thus 
in Ceyx tridactylus macrocarus another of the large dark races of 
birds, of which there are so many on the Andaman and Nicobar 
Islands. The difference in size, particularly of bill and wing, between 
this new form and typical Ceyz tridactylus is very evident upon even 
superficial comparison. Eight specimens of Ceyzx tridactylus tridac- 
tylus from various localities, including the Mergui Archipelago, 
measure as follows: 
Wing, 53.5-56.5 (average, 55.2) mm.; tail, 19-27 (average, 22.6); 
exposed culmen, 29.5-33 (average, 31.6); tarsus, 6-8.5 (average, 7.7). 
The United States National Museum series of Ceyx tridactylus 
macrocarus exhibits the following detailed measurements: 
Measurements of specimens of Ceyx tridactylus macrocarus. 
| 
| | 
| o 
a as Sex. Locality. | Date. Collector. Et ot 
: } . rn g a 
| a = a ‘et 
Bente ite 
178557....| Male....| Great Nicobar I., Nico- | Mar. 15,1901 | Dr. W.L. Abbott..| 57 | 24 | 35.5] 8.5 
bar Is.1 
Hy Sodoeeee || 5d Os-<c2|= 555 0 (en ae eee ane eee Mar. 14,1901 |....- DOs sos-en-ces- 59. 5| 22.5) 35.5) 8 
Za poGe=ne|=7=002-2--)-2--- MOS sansa s.02.eeees Mar sO; 1900s. =: GOst2 2 ssisceene 58 | 22 | 34.5) 9.5 
178562. ...| Female... .... GOR He Bie ee Ee Mar. 12,1901 |.--.. den ao eesheee 59.5] 25 | 35 9.5 
A7SOpORe- Je -GO-. soa.) -% GOees care esce sence Mar.) 9; 1901) | een0 Ol Ge occacen- 59 | 25.5) 35 9.5 
Aysba9 se e| 65-00: -2.|- = 2. LG en te ee ote eas Mar. 8, 1901 | he Oe COne safes ncaes bf, | 26)5 |) 35: 91) 10 
WASHOE =) she G0... -1 2105 GO estes ett cbneeeefecn a doles ese eee Gos 2s eee 62 | 24.5) 34 9 
BISON BE actin O- owwc|'¢ occ GO en caren caenee | | Mar. i, 190i | escee Goyc aoe 56 | 27.5, 33 9 
LR She eoaeoeunee Iseeee OG aes seseea- | S8ce Mar. 7 "7901 | frewisesé Gos esatss. eee 57 =| 22.5) 35 8.5 
go ed ee pa GON aeons ee Eee sos GOs eee e. Oeste 58.5) 23 | 34 9 
ASU CIM PGCE men eee es ete RE © SAA hm ioc cpa cade Ba wcin ce Bone oven Sees ene | 58.4) 24.3) 34.7] 9.1 
1 
1 Type. 
Two groups which are quite as well characterized as many current 
genera of Alcedinidae compose at present the single genus Ceyz.? 
One of these includes Ceyzx iridactylus, the type of Ceyzx, together with 
the majority of the species, and must of course retain the name Ceyz. 
The other comprises at least Ceyax solitarius Temminck, Ceyx argen- 
tatus Tweeddale, and Ceyx cyanopectus Lafresnaye, with possibly 
some further forms among those that I have not hee able to ex- 
amine, and should stand as Therosa Bonaparte,’ since Ceycis Gloger,' 
if not a nomen nudum, is a synonym of Ceyx. This group Therosa 
differs strikingly from Ceyz in the much more slender, more com- 
pressed bill, the outlines of which, both laterally and vertically, are 
2 The generic name Ceyr is commonly cited from Lacépéde, Mém. l’Inst. Nat. Sci. et Arts, vol. 3, 1801, 
p- 511, but the original description occurs in Lacépéde’s Tableau, Oiseaux, 1799, p. 10 (type, Alcedo tridactyla 
Pallas). 
3 Therosa Bonaparte, Consp. Gen. Avium, vol. 1, 1850, p. 158 (Miiller manuscript) (type by monotypy, 
Ceyz solitaria Temminck). 
4 Gemein. Hand- und Hilisb. Naturg., 1842 (1841), p. 338. 
