shear tail

[Eng. shear, s., and tail, s.] 1. Ornith.: The genus Thaumastura (q. v.); brilliantly colored Humming-birds from Central America. The Slender Shear tail ( Thaumastura enicura ) has the tail deeply forked; in Cora's Shear tail ( Т. core ) the two central tail-feathers are double the length of the next pair, the others being regularly graduated, and the exterior pair the shortest. 2. Entom.: Hadena dentin a , a widely-distributed night moth.