PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 377 



List of specimens examined — Continued. 

 FEMALES. 



Locality. 



H.W.H. 



273 H.W.H. 

 82510 Nat. M. 



989 Nat. M. 



503 E. P. B. 



587 E. P. B. 

 27 E. P. B. 



■Washington, D. C 

 Cambridge, Mass . 



Concord, Mass 



Carlisle, Pa 



Riverdale, N. T . . 



do 



do 



Average of females. 

 Average of males. . . 



Average of both sexes. 



Ad. 

 Ad. 

 Ad. 

 Ad. 

 Ad. 

 Ad. 

 Ad. 



Sept. 13 

 Sept. 18 

 May 16 

 May 18 

 Sept. 2 

 June 9 

 Sept. 4 



3.85 

 3.80 

 3.80 

 3.75 

 3.70 

 3.85 

 3.75 



2.90 



2.80 

 2.90 

 3.00 

 2.70 

 3.00 

 2.85 



1.15 

 1.12 

 1.10 

 1.12 

 1.10 

 1.20 

 1.12 



3.79 

 4.01 



2.88 

 3.05 



1.13 

 1.18 



.70 

 .70 

 .65 



.65 



.70 

 .70 



3.90 



2.96 



1.38 

 .69 



.52 

 .52 

 .52 

 .58 

 .52 

 .60 



1.11 

 .55 



3a. Hylocichla alici^ bicknelli Ridgw. 

 [BickneWs Thrush.) 



Ch. — Similar to Hylocichla aUciw Bairtl, but mucli smaller and (usiially ) 

 with the bill more sjlender. Wing, 3.40-3.80 (3.65) ; tail, 2.C0-2.90 (2,75) ; 

 culmen, .50-.52 (.5) ; tarsus, 1.10-1.25 (1.13) ; middle toe, .65-.70 (.08). 



Hal). — Breeding near the summit of Slide Mountain, Ulster County, 

 i^Tew York (Bicknell), and probably in other mountainous districts of 

 the northeastern United States -, in migrations mixed with H. alicice. 



Mr. Eugene P. Bicknell, of Eiverdale, N. Y., has very kindly given 

 me permission to describe the present new Thrush, which uo one else 

 appears to have met with. The above diagnoses and following remarks 

 are based entirely upon the specimens in Mr. Bicknell's collection, which 

 are the only ones I have seen. It is also proper to state here that the 

 differences presented by these specimens from true H. alicice were first 

 noticed by Mr. Bicknell, and by him pointed out to me. 



The seven specimens upon which this new race is based are uniformly 

 very much smaller than true H. alicice^ with slenderer bills, and present 

 also certain slight but rather indefinite peculiarities of coloration. After 

 a very careful comparison, however, I am unable to find any constant 

 color-differences which can be expressed in a diagnosis. Some speci- 

 mens, notably the two males from Slide Mountain (where Mr. Bicknell 

 found the present bird breeding in comj)any with H. nstulata swainsoni 

 and H. unalasccc paUasi, and having very distinctive habits and notes 

 as compared with the two species in question), have the upper parts 

 much browner than in alicia', with the wings and tail appreciably 

 more reddish. Iji fact, the general aspect of the upper i^arts ap- 

 proaches more closely that of H. ustulata, but the shade is much darker 



