858 



Mr. C. Ingram on the 



[This, 



and have dropped the prefix in tlieir so-called "outer supra- 

 orbital tract/' 



Text-figure 1. 



Pied Wagtail {Mutacilla luf/tdn-is), 1 day old. «, Supraorbital tract; 

 b, Capital tract ; c, Ulnar tract ; d, Femoral tract ; e, Occipital 

 tract; /, Humeral tract; r/, Spinal tract; h, Ventral tract; /, Crural 

 tract. 



Text-fio-ure 2. 



Wing of Pied Wagtail {Motacilla Ivyubris), about 8 days old, to 

 illustrate how the ulnar tract of neossoptiles is carried on the 

 proximal feathers of the greater and median coverts. 



Neossoptiles, whether pre-pennse oi- pre-pluinula?, may he 

 carried on the extremities of tlie succeeding feathers eitlier 

 (1) as a complete tuft, i. e., witii the barbs united at a com- 

 mon base, or (2) disintegrated, i. e., with individual down 



