262 Proceedings of the Biological Society of Washington. 



of its immaturity, this bird is considerably smaller than any of our other 

 specimens of this group. Wing 85; tail 73; culmen 25 mm. 



Thripobrotus warscewiczi bolivianus, new subspecies. 



Subspecific characters. — Similar to Thripobrotus warscewiczi warscewiczi 

 Cab. & Hein., of Peru, but ground-color of under parts somewhat more 

 olivaceous, its central stripes broader, margined laterally, but not termi- 

 nally, with black; throat appreciably buffier and without blackish margins; 

 maxilla paler. 



Type.— No. 137,393, Am. Mus. Nat. Hist., & ad., Incachaca, 7700 ft., 

 Prov. Cochabamba, Bolivia; May 14, 1915; Miller & Boyle. 



Range. — Subtropical Zone in Bolivia. 



Specimens examined. — Thripobrotus warscewiczi bolivianus. Bolivia: 

 Type locality, 4 o\ 4 9 ; Miguelita, 5000 ft., Prov. Cochabamba, 1 d\ 

 1 9 ; Locotal, 5800 ft., Prov. Cochabamba, 1 d", 2 9 ; "Yungas," 6000 

 ft., 1. 



Thripobrotus warscewiczi warscewiczi Cab. & Hein. Peru: San Miguel 

 Bridge, 5000 ft., Urubamba Canon, 1 9 • 



Thripobrotus warscewiczi O3quatorialis (Menegaux). Peru: Alamor, 

 4300 ft., Prov. Tumbes, 1 a 71 ; Ecuador: Zaruma, Prov. del Oro, 1 9 , 

 Gualea, Prov. Pichincha, 2 d", 1 9 ■ Colombia: Ricuarte, Narifio, 1 cf. 



Thripobrotus lacrymiger lacrymiger and T. I. sancta-martoe, adequate 

 series from Colombia. 



Remarks. — I have to thank Mr. C. B. Cory for comparing our specimens 

 of Thripobrotus warscewiczi with specimens of T. w. warscewiczi in the 

 Field Museum from Molinapampa, and hence topotypical of peruvianus 

 Tacz. (P. Z. S. 1882, p. 28, Tamiapuma, Peru). Mr. Cory writes that he 

 considers our specimen from the Urubamba Canon "to be nearly or quite 

 typical warscewiczi" and this name is evidently therefore applicable to all 

 the birds of this species from Peru with the possible exception of those 

 found near the Bolivian boundary, which may be nearer bolivianus, and 

 those from the Ecuadorian boundary, which, our Alamor specimen indi- 

 cates, are nearer cequatorialis. Mr. Cory also calls my attention to the 

 description by Menegaux of the Ecuador form as aquatorialis (Rev. Franc. 

 d'Orn., 1912, p. 389, Cayandeled, Ecuador), which I overlooked when writ- 

 ing of specimens from southwestern Colombia and Gualea, Ecuador (Bull. 

 A. M. N. H., XXXVI, 1917, p. 423). These birds, with others from 

 Zaruma and Alamor, are decidedly more rufous, both above and below, 

 than true warscewiczi, and show that aquatorialis is a valid, if but slightly 

 differentiated race. 



In pattern of marking the Bolivian form here described (as remarked 

 in the paper just referred to), resembles T. I. sancta-marto?, but the latter 

 is more rufous throughout and the throat as well as central stripes below 

 are ivory white. 



Mecocerculus subtropicalis, new species. 



Specific characters. — Similar to Mecocerculus stictopterus tceniopterus 

 (Cab.) but back greener, cap grayer and less sharply defined from nape, 



