146 AMERICAN ENTOMOLOGY. 



Oblate, flattened ; this term is applied to a spheroid of which the 



diameter is shortened at two opposite ends. 

 Oblong, the transverse diameter much shorter than the longitu- 

 dinal. 

 Obovate, inversely egg-shaped, the narrow end downwards or 



towards the base. 

 Obsolete, indistinct; inconspicuous. 

 Obtect, (pupa) wrapped in a crustaceous covering. 

 Obtuse, blunt ; ending in a segment or circle. 

 Occiput, the hinder part of the head; the part behind the vertex. 

 Ocellate, applied to the eye-like spots on the wings of Lepidop- 



terous insects, usually formed of a differently colored iris or 



ring, inclosing one or more small spots. 

 Ocelli, the stcmmata. 

 Oculi, the eyes. 



Ochreous, yellow with a slight tinge of brown. 

 Onychii, two or three small processes between the unguis at the 



termination of the tarsus. See j+ulviMus 

 Operculum, a lid ; a small valvular appendage. 

 Op>p>osite, placed on the side opposite to another, so that the bases 



of the two are on the same transverse line. See alternate. 

 Orbicular, round and flat, the diameters of the plane equal. 

 Orbit, an imaginary border around the eye. 

 Order, the subdivision of a class. 

 Os, the mouth and its parts. 

 Oval, somewhat egg-shaped, but the outlines of the ends are 



equal. See ovate. 

 Ovate, shaped like the longitudinal section of an egg, the outline 



of the ends being unequal. 

 Oviduct, the instrument and appendages with which the female 



deposits her eggs. See aculeus. 

 Oviposition, the act of depositing eggs; the manner in which 



eggs are deposited. 

 Oviparous, propagating by means of eggs. 

 Ovoviviparous, producing living young, the eggs being disclosed 



in the matrix of the parent. 



P. 

 Palate, the interior part of the transverse lip. 

 Pagina inferior, the lower surface of a wing. 



