USED IN ENTOMOLOGY. 91 



Ocular sclerite: the first or protocerebral segment of the head. 



Ocular tubercles: in Aphids, are a group of prominent facets on the hinder 

 part of each eye. 



Oculi-us: the eyes: an eye: refers to the compound eyes. 



Oculocephalic: applied to that pair of imaginal buds destined to produce the 

 cephalic region in Hymcnoptera. 



Odona: toothed: applied to Odonata by Fabricius because of the long teeth 

 on the maxilla and labium. 



Odonata: net-veined insects with mandibulate mouth; head free; thorax ag- 

 glutinate ; wings similar, elongate, flat ; metamorphosis incomplete ; copu- 

 latory organs of male near base of abdomen, separate from the testes. 



Odonate: bearing toothed mouth parts, like those of dragon flies. 



Odoriferous: diffusing an odor; applied to glands or secreting organs. 



(Ecology: see ecology. 



CEdagus: the penis. 



CEnocytes: large yellow cells arranged segmentally in clusters, in each side 

 of body cavity; associated with blood and fat bodies. 



CEsophageal bone: a plate below anterior part of oesophagus in Psoddcc. 



CEsophageal bulb: = subclypeal pump; q. v. 



CEsophageal diverticula: food reservoirs (q. v.) ; but more generally 

 applied also to any sac-like structure connected with the gullet. 



CEsophageal lobes: form posterior portion of brain or tritocerebrum. 



CEsophageal valve: a funnel-like folding of the oesophagus, extending into 

 the chylific ventricle in some insects, and forming a valve that controls 

 the entrance of food into that organ : = cardiac valvule. 



(Esophagus: the gullet: that part of the alimentary canal between the mouth 

 and the crop. 



Olfactory: pertaining to the sense of smell: those lobes of the deutocerebrum 

 from which the nerves supplying the antennae arise. 



Oligonephria: applied to insects with few urinary (Malpighian) tubes. 



Oligoneura: having few wing veins: specifically applied in Diptcra to 

 Cecidomyids. 



Olivaceous: with a tinge of olive green, usually as a shading [olive green]. 



Omaloptera: the pupiparous flies. 



Omia: the shoulders: the lateral anterior angles of an agglutinated thorax, 

 when they are distinct: = see umbone: in Coleoptera; a corneous sclerite 

 to which the muscles of the anterior coxa are attached; also the lateral 

 margin of the prothorax ; also the lateral margin of the scutellum in Cara- 

 bids and Dytiscids. 



Ommateum: the compound eye. 



Ommatidium-ia: one of the elements of which the compound eye is com- 

 posed. 



Omnivorous: a general feeder upon animal or vegetable food, or both. 



Oncus-i: a welt: applied to welt-like ridges on caterpillars. 



Onisciform: shaped like a wood-louse, Oniscus sp. ; applied to certain Ly- 

 caenid and other caterpillars. 



Ontogenetic : relating to the development of the individual. 

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