145 Oph 



Onychium. — The last joint of the tarsus which 

 carry the onychia or onyches. (Gr. onyx.) 



Ootheca. — The egg-envelope, or egg case ; the 

 membrane exuded by the female during ovi- 

 position, and with which she covers the 

 deposited eggs. (Gr. oon, an egg, and theca, a 

 case.) 



Oothecal membrane. — [See Ootheca.] 



Oothecal plates. — Two chitinous plates situated 

 at the external orifice, within the lower lip, of 

 the cloacal chamber, and exercised by the 

 female while laying her eggs, to cut the oothecal 

 membrane. 



Opacus. — Clouded, not transparent. (L. dark.) 



Opaline. — (Splendour.) Of a bluish-white, reflecting 

 prismatic colours. Like the splendour of opals. 

 (L. opal.) 



Opalizans. — Opaline. — (L. opal.) 



Opereula. — The covermg of the spiracles of the 

 metathorax. (L. operculnm, a lid or cover, from 

 operio, to cover.) 



Operculiform. — Having the shape or form of a lid 

 or cover. (L. operculmn, and forma.) 



Operculum. — A lid ; a small valvular appendage. 

 (L.) 



Ophthalmothecae. — -The eye-cases, that portion of 

 the theca enclosing the eyes. (Gr. ophihalmos, 

 the eye, and theca, a case.) 



