NO. 1803. HYP0THYMI8 AND CYAN0NYMPHA—0BERH0L8ER. 



601 



To judge from the limited Natuna Island series at hand, this form 

 appears to be identical in color with Hypothymis azurea 'pro'phata, 

 from Borneo and Sumatra, but in size it is sufficiently greater to war- 

 rant subspecific separation. 



Measurements of specimens of Hypothymis azurea gigantoptera examined. 



a Measured in the flesh by the collector. 



6 Type. 



HYPOTHYMIS AZUREA FORRESTIA, new subspecies. 



Chars, subsp. — Similar to Hypothymis azurea opisthocyanea,'^ but 

 posterior lower parts of male much more whitish, the crissum without 

 tinge of blue; upper parts, throat, and breast averaging darker; 

 axillars with little or no blue; size slightly smaller. 



Description.— Type, adult male, No. 173302, U.S.N.M.; Lough- 

 borough Island, Mergui Archipelago, January 23, 1900; Dr. W. L. 

 Abbott. Entire upper surface, sides of head and neck, chin, throat, 

 and breast hyacinth blue, the throat and breast slightly, the top 

 and sides of head much, paler than the back; a narrow line across the 

 base of the forehead, a tiny spot at the apex of the chin, a somewhat 

 crescentic bar across the jugulum, and a large crescentic patch on 

 the occiput velvety black; wings and tail sepia, margined externally 

 with marine blue; abdomen and crissum white, the upper portion of 

 the former washed with the blue of the breast; outer inferior wing- 

 coverts hyacinth blue, the rest gray mixed with white and washed 

 with blue; axillars white, slightly washed with blue exteriorly; 

 thighs grayish, washed with blue; "feet dark blue; eyelids blue; 

 bill blue, black at tip. " 



Measurements. — Two males: Wing, 75-77 (average, 76); tail, 

 77.5-80 (average, 78.8); exposed culmen, 11-12.5 (average, 11.8); 

 tarsus, 17.5-18 (average, 17.8). Two females: Wing, 72.5-73 

 (average, 72.8); tail, 73.5-75 (average, 74.3); exposed culmen, 12; 

 tarsus, 17-17.5 (average, 17.3) mm. 



Type-locality. — Loiighborough Island, Mergui Archipelago, Tenas- 

 serim. 



Geographical distribution. — Southern islands of Mergui Archipelago, 

 Tenasserim. 



With the single exception of Hypothymis a. opisthocyanea, this is 

 the largest form of the group, and by size alone is distinguishable. 



c See p. 602. 



