608 AVIAN GENUS MYIARCHUS RIDGWAY. 



of true M. lawrencii representing localities " from Vera Cruz north- 

 wards," and including- Giraud's type, said to have been obtained in 

 Texas. That the differences between them are really very consider- 

 able, the following tabulated statement of their characters will show: 



a'. Bill api»ioximately cylindrical (i. c. as in typical MuiarchuH). 



1. M. iiucatanensis. Wing, not less than 3.35 (average, 3.38) ; tail, not less than 3.32 



(average, 3.34); tarsus, 0.85; middle toe, 0.48; inner webs of second to fifth 

 rectriccs with inner half rufous; top of head distinctly more reddish l)rown 

 than back.* 

 a'^. Bill distinctly depressed (J. *■., as in type-species of the subgenus OinjchoptcruH). 



2. M. olivascens. Wing, not more than 3.10 (average 2.97); tail, not more tLan 



3.05 (average 2.87); tarsus, not more than 0.76 (average 0.74) ; middle toe, 

 not more than 0.42 (average 0.39^); inner webs of second to fifth rectrices 

 without any rufous in adult (a narrow edging only in young) ; top of head 

 same color as back. 



3. il. laiorencii. Wing, 3.22-3.35 (average 3.30) ; tail, 3.05-3.28 (average 3.15) ; tar- 



sus, 0.75-0.80 (average 0.78); middle toe, 0.40-0.42 (average 0.41); inner 

 webs of second to fifth rectrices merely edged with rufous; top of head dis- 

 tinctly darker (not more reddish) than back. (Colors throughout much 

 darker than in M. yttcatduensls, the upper surface of the tail more strongly 

 washed with rusty, and wing-coverts edged with brown or rusty instead of 

 light grayish. 



*Tliis character is of course obvious or conspicuous only in fresh plumage speci- 

 mens. 



