90 EXPLANATION OF TERMS 



Obpyriform: inversely pear-shaped. 



Obscure: not readily seen: not well defined. 



Obsite-us: a surface covered with equal scales or other bodies. 



Obsolete: nearly or entirely lost: inconspicuous. 



Obtect: wrapped in a hard covering. 



Obtected: applied to pupse when they are covered with a chitinous case which 



confines and conceals all appendages, though their outlines may be marked 



on the surface : see free, and coarctate. 



Obtuse : not pointed ; an angle greater than a right angle : opposed to acute. 

 Obtuse-angulate: two markings or margins meeting so as to form an obtuse 



angle. 

 Obtusilingues: short-tongued bees with the tip obtuse or bifid: see acuti- 



lingues. 

 Occipital foramen: the opening in the occiput, opposed to a similar opening 



in the prothorax : foramen magnum. 



Occipital margin: in Mallophaga, the posterior margin of the head. 

 Occipito-orbital bristles: in Diptcra; situated on posterior orbit of eye. 

 Occiput: that part of the head behind the vertex: in Diptera, the whole 



posterior surface of the head : in bees, the space between the vertex and 



the neck. 



Occlusor: applied to muscles which close an opening; e. g., spiracles. 

 Occult -us: hidden; concealed from superficial view. 

 Ocellar bristles: in Diptera, are situated close to the ocelli, usually directed 



forward ; often absent. 

 Ocellar ribband: a crescent-shaped, smooth thin belt across the eye region in 



butterfly chrysalids. 

 Ocellar triangle: a triangle, indicated by grooves or depressions, on which 



the ocelli are situated; Diptera. 



Ocellate: eye-like in appearance: in Lcpidoptcra, spots on the wings, bor- 

 dered by a colored iris or ring, and usually with a pupil. 

 Ocelli: plural of ocellus; q. v. ; = stemmata. 

 Ocelligerous: supplied with, or bearing, ocelli. 

 Ocellus: a simple eye, consisting of a single convex or bead-like lens, which 



conveys an image to a retina. Ocelli occur in larvae and, singly or in 



small groups, in adults : the compound eyes are made up of numerous 



ocelli. 

 Ochraceous: yellow with a slight tinge of brown [pale cadmium yellow and 



brown ochre]. 



Ochraeus-eus: = ochraceous. 

 Ochro-leucus: dilute ochraceous. 

 Ocular emargination: in Mallophaga, a lateral emargination of the head in 



which the eye is received posteriorly. 

 Ocular fleck: in Mallophdga, a small, intensely black spot of pigment in the 



eyes. 

 Ocular fringe: in Mallophaga, closely set small hair on posterior half of 



ocular emargination, sometimes extending on temporal margin. 

 Ocular lobes: of brain = procerebrum ; q. v. 



