476 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ELECTRON CARINATUS VIRIDIS Ridgway. 



COSTA RICAN KEEL-BILLED MOTMOT. 



Similar to E. c. carinatus but general color of under parts dull green, 

 tinged on foreneck, chest, and breast with oUve-gi-een, but ^vithout 

 the tawny oil-green suffusion always present and often conspicuous 

 in E. c. carinatus, the posterior under parts light bluish green; upper 

 parts clearer (less yellowish) green; bill relatively broader and more 

 strongly arched. 



Adult male. — ^Length (skin), 310; wing, 116; tail, 180; exposed 

 culmen, 37; tarsus, 17; middle toe, 14.^* 



Northwestern Costa Rica (San Carlos; La Vijagua). 



Prionirhynchus carinatus (not Prionites carinatus Du Bus) Boucard, Proc. Zool. 



Soc. Loud., 1878, 49 (San Carlos, Costa Rica).— Zeledon, Anal. Mus. Nac. 



Costa Rica, i, 1887, 119 (Costa Rica). 

 Prionornis carinatus Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1895, 468, 



part (San Carlos, Costa Rica). — Bangs, Proc. Biol. Soc. Wash., xxii, 1909, 



32 (La Vijagua, Costa Rica). — Carriker, Ann. Carnegie Mus., vi, 1910, 496 



(Costa Rica). 

 Electron carinatus viridis Ridgway, Proc. Biol. Soc. Wash., xxv. May 4, 1912, 89 



(La Vijagua, n. w. Costa Rica; coll. E. A. and O. Bangs). 



Genus EUMOMOTA Selater. 



Eumomota Sclater, Proc. Zool. Soc. Lond., 1857, 257. (Type, Prionites super- 



ciliosus Sandbach.) 

 Eumomotus (emendation) Murie, Ibis, Oct., 1872, 407. 

 Spathophorus b Cabanls and Heine, Mus. Hein., ii, Nov. 26, 1859, 112. (Type, 



Prionites superciliosus Sandbach.) 



Medium-sized Momotidse (length about 343-386 mm.) resembling 

 the genus Electron but with biU narrower (width at nostrils much less 

 than distance from nostril to tip of maxilla), less depressed, and less 

 concave next to the rounded (not flattened) culmenal ridge; tarsus 

 longer than middle toe with claw; middle rectrices nearly twice as 

 long as next pair, their webs denuded for a distance equal to more 

 than half the length of the second pair of rectrices, the large racquet- 

 shaped tip much longer than culmen; conspicuous, brightly colored 

 (turquoise blue) superciliary tufts, and thorax with a black patch 

 margined laterally with bright turquoise blue narrow feathers. 



Bill about as long as head, distinctly decurved terminally, broad 

 and moderately depressed, its width at nostrils equal to much less 

 than half but decidedly more than one-third the distance from nostril 

 to tip of maxilla, slightly but decidedly greater than its height at 

 same point; culmen conspicuously carinate, but the ridge broad and 

 rounded, distinctly but not abruptly elevated above the depressed 



a One specimen (the type). 



b Vou an&dnj (spatel) und <pip(o (tragen). (Cabanis and Heine.) 



