63 Dis 



Dimorphic, Dimorphous. — Presenting two distinct 

 types in the same sex. (Gr. di, and morfhe, 

 form.) 



Dioptrate. — Applied to an ocellate spot, of which 

 the puj)il is divided by a transverse line. 



Dioptrate ocellus. — A fenestrate ocellus divided by 

 a transverse line. (From G. dia, through ; and 

 oflomai, to see.) 



Diptera. — A family of hexapoc'a. An order of 

 insects including the true flies, as the common 

 house-fly, which possess only two wings and 

 two halteres. (Gr. di, two, and fteron, a wing.) 



Dis. — A Latin prefix, denoting separation, a parting 

 from ; away ; and having therefore the force of 

 a privative and negative. 



Disc. — The middle of the central portion. (L. 

 discus.) 



Disc. — The centre of the .superficies externa. 

 (L. discus, and from caro, flesh.) 



Discal cell. — (Wing.) See Cellulse discoidalis. 



Discoidal. — Pertaining to the disc ; like the disc 

 in form. (L. discus, and eidos, like.) 



Discoloured, Discolorate. — ^When the same part 

 of an insect has different colours. For example, 

 legs are called discoloured when the anterior 

 are red and the posterior black. (L. dis and 

 color, colour.) 



Discrete, Discreted. — The term used to show one 

 part is well defined, or marked off from the other. 

 (L. discretus, to separate.) 



