688 



NEW STORM PETREL FROM MEXICO — RIDGWAY. 



agreeing at all closely with the latter, as the Ibllowiug comparison 

 will show: 



Measurements. 



Coloration. 



O, townscndt. — Above dark sooty 1)rowu, black only on tortialfs. secondaries, prima- 

 ries, primary coverts, and tail; beneath sooty j^rayish brown. 

 O. melania. — Above raA^en black ("uigro covacina"); beneath sooty. 



In the measurements of 0. townsendi given above, the first under each 

 heading represents the nearest approach, in a series of ten specimens, 

 to the corresponding measurement of 0. melania, the number immedi- 

 ately following (in parentheses) being the average of these ten speci- 

 mens. It will be observed that while the length of the tail, the depth 

 of its fork, and the length of the tarsus are the same in the two species, 

 the wing, the exposed culmen, and the middle toe are very much longer 

 in 0. melania, than in 0. toicnscndi. The measurements of 0. melania 

 were taken from the type by Pucheran, for Prof. Baird, in millimeters, 

 and have been carefully reduced to inches and huiidredtlis. 



