from the Pilcomayo. 605 



contain a graphic account of the peculiar wilderness or 

 palm- desert traversed by the Expedition. The specimens 

 entrusted to me consist of two males and one female 

 Celeus, likewise two males and one female Picumnus, and 

 Mr. Sclater has expressed his opinion that the Celeus is 

 new^ and wishes it to bear the name of its discoverer. I quite 

 agree with Mr. Sclater in his determination of this bird^ and, 

 in compliance with his wish^ name it Celeus kerri. The 

 Picumnus is also new to science, and will bear the name of 

 pilcomayensis, as suggested by Mr. Sclater. 



Below will be found diagnoses of the two species. 



-^ 1. Celeus kerri, sp. n. 



Adult male. Resembles C. lugubris, but differs in having ' 

 the upper part of the back, the scapulars, and the wing- 

 coverts nearly black, with a brownish or slightly olivescent 

 tinge, and the transverse markings narrower and fewer ; the 

 underparts blackish brown, nearly as dark as the back, and 

 with less rufous on the under tail- coverts ; the quills brownish 

 black, and the exposed rufous bars on the secondaries very 

 much narrower, being about one fifth the width of the inter- 

 spaces (the rufous bars in C lugubris being about one half 

 the width of the darker interspaces) . The wing, seen from ; 

 below, is very different ; the base of the inner webs of the 

 primaries and the barring on these, as well as upon the -v- 

 inuer webs of the secondaries (except close to the shaft), being 

 white; the under wicg-coverts and axillaries white, with 

 scarcely any yellow tinge. The dimensions are also greater. 

 Total length 10*0 inches, culmen 1-18, wing 5*9, tail 3'2, 

 tarsus I'O; toes (without claws) — outer anterior 0*9, outer 

 posterior 0*83, inner anterior 0*62, inner posterior 0*38. 

 Type, Eio Pilcomayo, 4.5.90. No. 95 on label. 



Adult female. Differs from the adult male in the absence 

 of red on the malar region, this being blackish brown, the 

 feathers having buff margins. Total length 100 inches, 

 culmen 1'12, wing 5'7, tail 3*3, tarsus 1*02. Rio Pilcomayo, 

 20.3.90. No. 25 on label. 



In this specimen the upper back, scapulars, and wing- 



