Page 631. 
192 ON CERTAIN MUSCLES OF BIRDS. 
ference to them is quite unnecessary, as they can easily be found in 
the works of those authors. 
The Passeres possess the femoro-caudal, the semitendinosus, and 
the postacetabular portion of the tensor fascise; the accessory semi- 
tendinosus is present in all except Dicrurus (which has only ten 
rectrices) ; the ambiens and the accessory femoro-caudal are absent.* 
The Pict possess the femoro-caudal, the semitendinosus, and the 
postacetabular portion of the tensor fascie; the ambiens and the ac- 
cessory femoro-caudal are absent; and they may be divided into two 
subfamilies, according to whether the accessory semitendinosus is 
present or absent. 
The accessory semitendinosus is absent in 
Picus major. Picoides tridactylus. 
minor. 
The accessory semitendinosus is present in 
Geeinus viridis. Chloronerpes yucatanensis. 
Leuconerpes candidus. Mulleripicus fulvus. 
Melanerpes formicivorus.  _Hypowanthus rivolit. 
Yunz torquilla agrees in all these points with Gecinus viridis. 
The Steatornithide possess the semitendinosus, and a very narrow 
accessory semitendinosus. The ambiens, the femoro-caudal, the acces- 
sory femoro-caudal, and the postacetabular portion of the tensor 
fasciee are absent. 
Species examined. 
Steatornis caripensis. 
The Caprimulgide possess the femoro-caudal, the semitendinosus, 
the accessory semitendinosus, and the postacetabular portion of the 
tensor fascie; the ambiens and the accessory femoro-caudal are 
absent. 
Species examined. 
Caprimulgus europeeus. Chordeiles texensis. 
The Trogonide possess the femoro-caudal and the semitendinosus ; 
the ambiens, the accessory femoro-caudal, the accessory semitendino- 
sus, and the postacetabular portion of the tensor fasciz are absent. 
Species examined. 
Trogon mexicanus. Trogon puella. 
* In my paper on the carotid arteries of birds a long list is given of the Passeres 
in which the carotid vessels were examined ; in all these the muscles of the thigh . 
were dissected also. In a specimen of Pomatostomus temporalis there was an acces- 
sory femoro-caudal on the right side; on the left there was not a trace of it. 
