BIRDS OF NORTH AND MIDDLE AMERICA. 283 



Centr.-Am., Avos, ii, 1891, 176, part (Chiriquf, Ohitra, and Galov6vora, 



Panamd) . 

 [SiUasomus] sylvioidcs Siiarpe, Hand-list, iii, 1901, 77, part (Panamd). 

 SUtasomiis Icvis Bangs, Proc. New Engl. Zoul. (11 id), iii, Jan. 30, 1902, IG (lUtquete, 



Chiriquf, Panama, alt. 4,000 ft.; coll. E. A. and O. Jiangs). 



SITTASOMUS SYLVIOIDES JALISCENSIS Nelson. 



JALISCO SITTASOMUS. 



Similar to ;S'. s. sylvioidcs but much larger, ami color of under 

 parts slightly darker. 



Adult male. — Length (skm), 167; wing, 84; tail, SI; culmen, 10.5; 

 tarsus, 18.5; middle toe, 12, '^ 



Southwestern Mexico, in State of Jalisco (San Sebastian). 



SiUasomus sylvioidcs (not of Lafresnaye) Nelson, Ank, xv, 1898, 15(5 (San Sebas- 

 tian, Jalisco). 



SiUasomus sylvioidcs jaliscensis Nelson, Ank, xvii, July, 1900, 204 (San Sebas- 

 tidn, n. w. Jalisco; coll. U. S. Nat. Mus.). 



[SiUasomus] jaliscensis Sharpe, Iland-list, iii, 1901, 77. 



Genus DECONYCHURA Cherrie. 



Deconychura b Cherrie, Proc. II. S. Nat. Mns., xiv, no. 855, Sept. 4, 1891, 338. 

 (Tyjje, D. typica Cherrie.) 



Medium sized or rather small Dendrocolaptida^ (length about 170 

 mm.) with narrow operculatc nostrils, tail equal to or longer than 

 wing, graduated for about half its length, with the very rigid shafts 

 of rectrices strongly decurvetl subterminally, and with culmen 

 (from base) longer than tarsus, and inner webs of remiges without 

 any buffy or ochraceous cross-band. 



Bill nearly as long as head, straight, rather stout, broad and 

 depressed basally, its width at latero-frontal antia? much greater 

 than its depth at same point and equal to a little less than half the 

 distance from nostril to tip of maxilla; culmen distinctly ridged, 

 straight for basal half or more, gradually but decidedly decurved 

 terminally; tomia slightly but distinctly decurved termmally, with- 

 out trace of notch; gonys faintly convex basally, straight or even 

 very famtly concave distally. Nostril exposed, posteriorly in con- 

 tact with latero-frontal feathering, narrowly ovate or elliptical, 

 longitudinal, margmetl above by a rather narrow membraneous 

 operculum. Rictal bristles obvious but very small, and feathers of 

 chin and lores with minute terminal seta^. Wing rather long and 

 pointed, with longest primaries exceedmg secondaries by less than 

 length of exposed culmen; eighth primary longest, the seventh 

 and sixth, successively, but little shorter, the tenth (outermost) 

 nearly three-fourths as long as the longest, the ninth shorter than 

 sixth. Tail equal to or slightly longer than wing, graduated for 



o One specimen (the type). 



b Derived from dim ten, ciwf claw, and odpd tail. 



