494 REVIEW OF GENUS DENDROCINCLA. 



black; legs and feet dark born-color. Lengtb (skin) 8.50, wing 4.15» 

 tail 3.85, exposed culmen 1.00, bill from nostril .80, depth at nostril .30, 

 tarsus .92. 



Another adult male from the same locality (same collector and date) 

 is exactly like the type in coloration, and measures as follows: Wing, 

 4.20; tail, -l.to; exposed culmen, 1.10 ; bill from nostril, .77 ; tarsus, 

 .95. 



An adult female from Para (May 19, 1887 ; C. B. Kiker) is similar in 

 coloration but somewhat smaller, measuring, wing, 4.00 ; tail, 3.00; ex- 

 posed culmen, 1.00; bill from nostril, .75; depth of bill at nostril, .25; 

 tarsus, .95. 



This species has almost exactly the same form and dimensions as 

 D. olivacea Lawr., but differs very conspicuously in coloration, as stated 

 above. 

 10. Dendrocincla castanoptera, sp. nov. 



Sp. Char. — Similar to J), mcrida (Light.), but smaller, head darker, 

 fore neck and chest inclining to smoky olive, and bill much smaller, as 

 well as entirely black, or else with only the gonys whitish. Wing 3.65- 

 3.70, tail 3.15-3.20, exposed culmen .85-.90. 

 Habitat. — Lower Amazon (Diaraantina). 



Adult male (fype, No. 112,280, Diamantina, Lowt^r Annizon, July 15, 

 1887; Mrs. C. B. Biker): Pileum and hind-neck uniform bister brown, 

 changing gradually into a brighter brown (almost mummy brown) on 

 back and scapulars; wings and tail uniform chestnut; upper tail-coverts 

 lighter chestnut. Sides of head and under parts, except chin and upper 

 throat and under tail-coverts, similar to ])ileum, but somewhat paler, 

 and inclining to smoky brown or brownish olive on fore neck and chest; 

 chin and upper throat pale dull butfy grayish, or dull brownish whitish, 

 the feathers with paler shaft streaks; under tailcoverts rusty chestnut, 

 like upper coverts; axillars and under wing-coverts bright tawny. Bill 

 deep black, the gonys whitish ; legs and feet grayish dusky (dark plum- 

 beous in life'). Length (skin) 7.00, wing 3.70, tail 3.20, exposed culmen 

 .85, gonys .55, depth of bill at nostril .25, tarsus .98. 



Adult female (same locality and date; C. B. Biker) : Similar to the 

 male, but only the chin dull whitish, and the bill wholly deep black. 

 Length (skin) 7.25, wing 3.05, tail 3.15, exposed culmen .90, gonys .bb^ 

 depth of bill at nostril .25, tarsus .92. 



The specimens described above have been compared with two speci- 

 mens named Dendrocincla merula in the Lafresuaye collection, one of 

 which (No. 2304)* seems to agree sutliciently well with the descrip- 

 tion oi Dendrocolaptes merula Light. (Berl. Abhandl., 1819, 208 ; ib., 1821, 

 2G4). The Diamantina birds are very distinct, however, differing very 

 conspicuously in the characters pointed out above, so that there is no 

 recourse but to consider them as belonging to an undescribed species. 



* No. 'iSOS, Lafresnaye collection, given in tlie catalogue as "Dendrocincla merula 

 Lafr., 9 ad. (Type), " is the type of my D. lafresnai/ei. (See p. 492.) 



