114 OKNITHOLO GISTS' COMPENDIUM. 
Tracheopho'nae (L.), n. The name of a natural group of passerine 
birds, characterized by having the syrinx placed at the lower end of 
the trachea. 
Transverse' (L. transver'sus), a. Crosswise, or at right angles with the 
longitudinal axis of the body or feather. 
Transversely, ad. Crosswise. 
Tridac'tyle (L. tridac'tylus), a. Three-toed. 
Trino'mial, a. Composed of three names. In Biology, a name com- 
posed of three terms, — a generic, a specific, and a subspecific. 
Triv'ial (L. trivia'lis), a. Sometimes said of a specific name. 
Trochi'li (L.), n. The ordinal or sub-ordinal name of a natural group of 
" Picariae," including only the Humming-birds ( Trochilidce). By most 
authors, however, the group is accorded only family rank, and associ- 
ated with the families Cypselidce and Caprimulgidce, in a so-called order 
Macrochires, or Cypseli. 
Trun'cate (L. trunca'tus), a. Cut squarely off. 
((L. turco'sus), n. The finest possible light blue color, 
similar to the stone of the same name. (Italian 
ultramarine + Schoenf eld's " lichtblau " + white.) 
(Plate IX. fig. 20.) 
Tylar'i (L. ; pi.), n. The pads on the under surface of the toes. 
Tym'panum (L.), n. Properly, the ear-drum; but also the naked in- 
flatable air-sacs on the neck of some species of Grouse (Tetraonidce). 
Type (L. ty'pus), n. Of various signification in Ornithology. The type 
of a genus is that species from which the generic characters have been 
taken, or which is specified as the standard ; the type of a species is 
the particular specimen from Avhich the species was originally described. 
The type, or typical, form of a group is that which answers best to the 
diagnosis of that group. 
Typ'ical, a. Agreeing closely with the characters assigned to a group, 
genus, or species. 
U. 
Ul'na (L.), n. The posterior bone of the forearm. 
Urnar, a. Pertaining to the ulna. 
Ultramarine' Blue (L. idtramari'nus ; lazuli'nus), n. A very pure lovely 
blue color, like the pigment called ultramarine. (Plate IX. fig. 9.) 
Um'ber Brown (L. umbri'nus), n. The color of the pigment called raw 
umber. (Plate III. fig. 14.) 
Unarm'ed (L. mu'ticus), a. Said of a toe which has no claw ; a tarsus, 
or a wing, which has no spur ; etc. 
