606 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



HYPOTHYMIS AZUREA ISOCARA, new subspecies. 



Chars, subsp. — Similar to HypotTiymis azurea amelis,'^ but decidedly 

 larger; male with abdomen less extensively bluish; upper parts 

 somewhat paler, less purplish blue, the pileum slightly more con- 

 trasted with back; female resembling that of Hijpotliymis azurea 

 amelis, but paler below, the abdomen conspicuously more whitish. 



Description.— Ty\:,e, adult male, No. 179437, U.S.N.M.; Pulo 

 Bangkaru, Banjak Islands, western Sumatra, January, 1902; Dr. W. 

 L. Abbott. Upper surface, throat, and breast rather light cyanine 

 blue, the pileum perceptibly paler, the throat and breast barely so; 

 a narrow frontal line at the base of the bill, a very small chin spot, 

 a crescentic occipital patch, and a slightly crescentic bar on jugulum 

 velvety black ; wings and tail slate black, the wing-quills and rectrices 

 broadly margined externally with marine blue, the wing-coverts with 

 cyanine blue; middle of lower abdomen white, almost pure; rest of 

 abdomen, sides, flanks, and crissum grayish or grayish white, heavily 

 washed with deep campanula blue; under wing-coverts exteriorly 

 cyanine blue, otherwise slate gray, mixed a little with whitish; 

 axillars pale grayish, the outer ones edged with deep campanula blue; 

 thighs slate gray, overlaid with blue. 



Measurements. — Two males: Wing, 71.5-72 (average, 71.8); tail, 

 70-72 (average, 71); exposed culmen, 10.5-11 (average, 10.8); tarsus, 

 15.5-17 (average, 16.3) mm. One female: Wing, 69; tail, 68; ex- 

 posed culmen, 9.5; tarsus, 16 mm. 



Type-locality. — Pulo Bangkaru, Banjak Islands, western Sumatra. 



Geograpliical distribution. — Banjak Islands, western Sumatra. 



The present form is larger than Hypothymis azurea propTiata, and 

 in the male has the posterior lower parts, especially the crissum, more 

 bluish, the latter being seldom strongly bluish in H. a. prpphata, 

 always ( ?) so in H. a. isocara; axillars somewhat more grayish and 

 more extensively blue; pileum darker, less contrasted with back; 

 blue of remaining upper parts and of under surface paler and less 

 purplish. The female does not differ appreciably in color from the 

 same sex of //. a. prophata. From Hypothjmis a. gigantoptera of 

 the Natuna Islands, H. a. isocara differs as from H. a. propliata, 

 except that it is not larger. It may be distinguished from Hypo- 

 thymis a. ponera, male, by its rather less purplish blue upper parts; 

 the darker pileum less contrasted with back; the more extensively 

 bluish abdomen; the more grayish and more heavily blue-washed 

 crissum; and somewhat more grayish and somewhat more exten- 

 sively blue axillars. Compared with Hijpotliymis azurea leucopTiila,^ 

 it is slightly larger; in the male the posterior lower parts, especially 

 the crissum, are more grayish and more washed with blue; the 



"Seep. 608. & See p. 607. 



