NOV. 4, 1921 WETMORE: NEW TINAMOUS 435 



rictal streak dull black; hindneck tawny-olive, paler on sides of neck ; base 

 of hindneck becoming pale Saccardo's umber, barred with black ; back, tertials, 

 inner secondaries and rump, Saccardo's umber, barred heavily with black, 

 the black bars margined distally with pinkish buff, tips of feathers pinkish 

 buff; outer secondaries, wing-coverts, tail, and upper tail-coverts similar 

 but with black markings greatly restricted so that they are less in area than 

 the lighter colors, outer greater coverts with Saccardo's umber replaced by 

 orange-cinnamon; alula and primaries hazel, outer webs of alula and of three 

 outermost primaries barred narrowly with black, dark markings faintly indi- 

 cated on outer webs of other primaries; tips of primaries becoming mouse 

 gray, outer webs paling to cinnamon; secondaries hazel, barred across tips 

 and on outer webs with black ; chin and throat whitish (apparently discolored 

 by stain) ; foreneck and upper breast tawny-olive, feathers of neck in front 

 and on sides with dark streaks extending to ends of shafts, nearly concealed 

 except on foreneck, broader basally and narrowed distally ; rest of underparts 

 drab, feathers of breast and lower sides of neck with indistinct markings of 

 chamois; sides, flanks and under tail-coverts barred strongly with black, 

 the black bars margined distally with pale olive-buff; abdomen and tibiae 

 barred narrowly with black; under wing-coverts hazel; anterior margin of 

 shoulder drab barred with black, with occasional lighter bars of pinkish buff. 

 Maxilla dull black, becoming brownish at margins; mandible and maxilla 

 below nostril honey yellow, darker at tip of mandible ; tarsus and toes mikado 

 brown, more or less discolored from grease (in dried skin) . 



Measurements of type. — Wing 188.5 mm., tail (from base of coccyx to tip 

 of longest feather) 63 mm., exposed culmen 42 mm., tarsus 61.3 mm. 



Range. — Known from Parana in the Province of Entre Rios, Argentina. 



Remarks. — The bird described above as Rhynchotus arcanus is so distinct 

 from any of the known forms of the rufous-winged tinamou, R. rufescens 

 (Temminck), as to necessitate recognition as a full species. For some time 

 I was under the impression that the strongly barred wing feathers in this 

 individual might possibly represent the juvenal plumage of rufescens, but 

 examination of a three-quarters-grown Rhyncholus rufescens alleni Chubb 

 from Matto Grosso, borrowed from the American Museum of Natural Histor^^ 

 through the kindness of Dr. F. M. Chapman, shows that the immature bird 

 agrees with the adult in plain, uniform flight feathers without prominent 

 markings. The presence of dark lines on the foreneck and of squamate 

 paler markings on the breast in arcanus suggest the condition found in R. 

 maculicollis G. R. Gray, a species known from present published records 

 from Bolivia (the type locality) and the Province of Tucuman, Argentina. 

 It is possible that the bird from Parana eventually may prove to be a pale 

 eastern form of mactdicollis. 



Nothura maculosa savannarum, subsp. nov. 



Characters. — Similar to Nothura maculosa nigroguttata Salvadori but less 

 mottled above, with black markings on dorsal surface much more extensive, 

 covering the major part of the feathers of back and rump; hindneck paler, 

 with finer streaks ; markings on breast darker, confined to small heart-shaped 

 spots or elongate marks toward tips of feathers; lateral bars on underparts 

 bolder, not extending so far inward toward the median line. 



