BIRDS OF NORTH AND MIDDLE AMERICA. 49 



KEY TO THE SUBSPECIES OF ERIONOTUS PUNCTATUS. 



a. Smaller (wing averaging less than 71 in adult naales, less than 68 in adult females); 

 adult females with lateral under parts distinctly darker than median portion. 

 b. Paler; adult female more olivaceous. (South America in general.) 



Erionotus punctatus punctatus (extraliniilal)." 

 bb. Darker; adult female more tawny or rufescent. (British Honduras to western 



Ecuador.) Erionotus punctatus atrinucha (p. 49). 



aa. Larger (wing averaging 72.1 in adult male, 70.1 in adult female); adult female 

 with lateral under parts not distinctly darker than median portion. (Gorgona 

 Island, Bay of Panama.) Erionotus punctatus gorgonje (p. 52). 



ERIONOTUS PUNCTATUS ATRINUCHA (Salvin and Godman). 



SLATY ANTSHRIKE. 



Similar to T. p. punctatus,^ but adult male with gray of both 

 upper and under parts darker and adult female with general colora- 

 tion darker and less rufescent (more oUvaceous), especially the 

 pileum.*^ 



Adult ma?e .—Pileum black, more or less mixed with slate-gray 

 on forehead (the latter sometimes extensively slate-gray barred or 

 flecked with black); hindneck mixed black and slate-gray, some- 

 times uniform black; back mixed black and slate-gray (the former 

 predominating), the feathers extensively pure white basally; scapu- 

 lars and rump plain slate-gray; exterior row of scapulars black, 

 broadly edged with white; wings black, all the wing-coverts con- 

 spicuously tipped with white, tertials broadly edged with white, the 

 other remiges narrowly edged Vvdth light gray; upper tail-coverts 

 black, broadly tipped with white; tail black, all the rectrices tipped 

 with a large white spot, except middle pair, which are narrowly tipped 

 with white or else wholly black; outermost rectrix, on each side, 

 with a c^uadrate spot of white crossmg outer web beyond middle 

 portion;'^ superciliary region, sides of head and neck, and under 

 parts plain gray (no. 6) or slate-gray, the sides of head (often chin 



» [Lanius] nsevius Gmelin, Syst. Nat., i, pt. i, 1788, 308, not of p. 304. — Tityra 

 cayanensis, female! (Cayenne); Latham, Index Orn., i, 1790, 81. — Thamnophilus 

 nasvius (not of Vieillot, 1816) Swainson, Zool. Journ., ii, no. v, April, 1825, 90; Orn. 

 Drawings, pi. 59; Sclater, Cat. Birds Brit. Mus., xv, 1890, 197, jmrt. — E[rionotus] 

 naevius Cabanis and Heine, Mus. Hein., ii, 1859, 16. — Lanius punctatus Shaw, Gen. 

 Zool., vii, pt. ii, 1809, 327 (based on "Le Tachet. Levaill[ant] Ois." [pi. 77, fig. 1]).— 

 (?) Thamnophilus nsevius f(i6wen^mTaczanowski, Orn. du Perou, ii, 1884, 9. — T[ham- 

 nophilus] naevius naevius Hellmayr, Abh. K. B. Akad. Wiss., ii kl., xxii Bd., iii 

 Abt., 1905, 659 (crit.). 



& See "Key," top of this page. 



c This is an unsatisfactory subspecies, and I am doubtful as to its validity. 

 Both very dark and light colored examples occur among specimens from Bogota, 

 and I find it extremely difficult to correlate the color differences with geographic 

 distribution. 



d The second and third pairs (counting from outside) are sometimes similarly marked. 



81255°— Bull. 50—11 4 



