Breast: the under surface of thorax or sternum.
Breast-bone: in Cecidomyid larvae; a horny, more or less elongate process of the under side behind the mouth opening, supposed to represent the labium = anchor process.
Breathing pores: see spiracle.
Brevis: short.
Brides: Homoptera; two pieces on the face, one each side of clypeus and lower part of front.
Bridge: Odonata; a secondary longitudinal vein connecting the radial sector (Comst.) with Mi + 2, apparently forming a continuous part of the radial sector; it is the proximal portion of the subnodal sector of de Selys and Hagen.
Bridge cross veins: Odonata; those cross veins, one or more in number, extending between M1 + 2 and the bridge (in de Selys between principal and subnodal sectors) proximal to the oblique vein.
Brin: the fluid silk thread from each salivary gland.
Bristle: a stiff hair, usually short and blunt.
Broken: interrupted in continuity; as a line or band.