NO. 1916. REVIf^ION OF BVT0RIDE8 VIRE8CEN8—0BERII0LSER. 



549 



The only adults examined are from Managua, in western Nicara- 

 gua, but it is fair to assume that this is tlie form of all western 

 Nicaragua, where it is apparently resident, at least as far north 

 as Momotombo,* and as far south as Ometepe Island- and San 

 Juan del Sur,^ possibly even to the Bay of SaUnas,* in extreme 

 nortliwostern Costa Rica. To what form, however, belong the birds 

 from eastern Nicaragua, whence records exist of some green heron, 

 at tlie Escondido River ''• and the Bluefields River," it is unsafe to 

 hazard a guess, and the examination of specimens must decide. It 

 may be the present form, or Butorides virescens virescens, or even 

 Butorides virescens hypernotius.'^ 



Only three specimens have been seen, both from Managua, 

 Nicaragua. 



Measurements of specimens of Butorides virescens mesalus. 



BUTORIDES VIRESCENS HYPERNOTIUS, new subspecies. 



CJiars. suhsp. — ^Like Butorides virescens virescens, but wing, tail, and 

 tarsus of male shorter; barely distinguishable in color, but posterior 

 lower parts averaging shghtly paler; neck shghtly less purphsh. 



Description.— Type, adult male. No. 206342, U.S.N.M., Biological 

 Survey collection; Rio Indio, near Gatun, Canal Zone, Panama, Feb- 

 ruaiy IG, 1911; E. A. Goldman; original number, 13736. Pileum, 

 occipital crest, postocular region, and a short subauricular streak, 

 deep, glossy bottle green; malar stripe bufF; submalar stripe black 

 and purplish maroon; cheeks, auriculars, sides and back of neck, pur- 

 plish maroon, somewhat more rufescent anteriorly, somewhat glau- 

 cous posteriorly; upper surface of body deep bottle green, ratlier 

 glossy, the long, pointed, plume-like feathers of back and scapulars 

 more oily green and a Uttle glaucous; wings fuscous, the primaries 

 and outer secondaries dull, dark, greenisli-bhie slate color, the inner 

 primaries and outer secondaries narrowly tipped with white; tertials, 



> Sharpe, Cat. Birds Brit. Mus., vol. 26, 1898, p. 190. 



» Ridgway, Proc. U. S. Nat. Mus., vol. 0, 1SS.3 (1SS4), p. 390. 



' Idem, p. 379. 



* Salvia and Godman, Biol. Cent. Amer., Aves., vol. 3, 1901, p. 170. 

 » Richmond, Proc. U. S. Nat. Mus., vol. 10, ISftl, p. 527. 



• Sclater and Salvin, Proc. Zool. Soc. London, 1807, p. 280. 

 » See p. 549. 



8 Used in measurement averages on p. 548. 



» From Managua, Nicaragua. 



>* From Nlitaragua. 



u Type, also from Managua, Nicaragua. 



