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



occuttus, hidden, as caput occultum in Cassida. 



ocettatus, applied to the eye-like spots on the wings of Lepidoptera usually formed 



of a differently colored iris or ring, inclosing one or more small spots. 

 ocellus, the eye-like spot, see ocellatus. 



ocelli, simple eyes, small lentil shaped eyes; the stemmata; the eyes of coleopter- 

 ous larvae. 

 oculi, the ejes, compound eyes, consisting of numerous hexagonous surfaces, 



each of which is itself an eye. The number of those lenses is in an ant 50, 



Sphinx ligustri 1300, housefly 4900, Melolontha 6300, Libellula 12544, Mor- 



della 25088. 

 ochraeeus, yellow with a slight tinge of brown. 

 olivaceus, of an olive-color, dirty light green. 

 < I in it i, lateral margin of the scutellum in Carabidae and Dytiscidae, which appear 



separated; the margin of the anterior stethidium. 

 Onychium, a small process between the claws; see pulvillus and empodium. 

 opacus, (surface) without any lustre. 

 opalinus, (surface) reflecting like opal. 

 operculum, a lid; a small valvular appendage; the scutes covering the mesothoracic 



stigma; see peritrema. 

 ophthalmotheca, the covering of the eyes in pupae. 

 oppositus, placed on the side opposite to another, so that the bases of the two are 



in the same transverse line. 

 Ora, border, after Kirby the broad lateral margin of the prothorax. 

 ora coleopterorum, margin of elytra. 



orbicular, round and flat, the diameters of the plane being equal. 

 orbita, an immaginary border around the eye; (the border around the compound 



eyes.) 

 order, the sub-division of a class, as Coleoptera etc. 

 orickalceus, brassy, yellow like brass. 

 orijUAum, anal or genital opening. 



orismologia, description or terminology of the. different parts of insects. 

 Orthoptera, an order of insects with four membranaceous reticulated wings, as 



libellula. 

 os, the . louth of the insects in general. 

 ostiolum odoriferum or fragrans, the opening at the sides of mesosternum and 



metanotum in Hemiptera, secreting the smelling fluid. 

 osus, (affix) expresses fullness or abundant presence of a quality; as squammo- 



sus, covered with scales. 

 ovale, somewhat egg shaped, but the outlines of the ends are equal. See ovate. 

 ovatum, shaped like the longitudinal section of an egg, the outlines of the ends 



being unequal. 

 oviduct, the instrument and appendage with which the females deposit their eggs. 

 ovipositkm, the act of depositing eggs; the manner in which eggs are deposited. 

 iirijiiirus. propagating by means of eggs. 

 ovoviviparous, producing living young, the eggs being disclosed in the matrix of 



the parent. 



