USED IN ENTOMOLOGY. 149 



Vertex: the top of the head between the eyes, front and occiput: in bees, 

 that part of the head adjacent to and occupied by the ocelli : in Noto- 

 nectids, " the imaginary anterior margin of the notocephalon." 



Vertexal: occurring on or near the vertex, or directed toward it. 



Vertical cephalic bristles: in Diptcra, are two pairs, inner and outer, in- 

 serted more or less behind the upper and inner corner of the eye ; erect, or 

 the inner pair convergent, the outer pair divergent. 



Vertical margin: in Diptcra, the limit between front and occiput. 



Vertical triangle: in <$ Diptcra, the small triangle upon which the ocelli are 

 situated; limited behind by vertex, in front by eyes. 



Verticil: one of the whorls of long fine sensitive hair arranged symmetrically 

 on the joints of the antennae in certain Diptcra. 



Verticillate: placed in whorls: antennae in which the joints have a circle of 

 long, fine hair as in Cecidomyiids. 



Vesicant: blistering: able to produce a blister. 



Vesicle of penis: in Odonata, a sac with chitinous walls, attached to the 

 sternum behind the penis. 



Vesicles: little sacs, bladders or cysts: applied to extensible organs produc- 

 ing odors or secretions, as in some beetles and caterpillars. 



Vesicular: bladder-like; beset with spherical prominences. 



Vesicula seminalis: see seminal vesicles. 



Vestibule: the space around the ovipositor formed by the projecting margins 

 of the surrounding segments : the space between the occluding structure of 

 the spiracle and the valve opening into the trachea itself. 



Vestigial: small or degenerate: only a trace or remnant of a previously 

 functional organ. 



Vestiture: the surface clothing, whether of a hairy or scaly character. 



Vexhillum: in Hymcnoptcra, an expansion on the tip of tarsi of certain 

 fossorial groups. 



Vibrant: having a rapid motion to and fro. 



Vibratile: formed for vibratory motion: used to express the almost con- 

 tinual movement of the antennse of some Hymenoptera, and the wings 

 of some Diptera. 



Vibrissas: curved bristles or hairs in some Diptera, situated between the 

 mystax and the antennse : whiskers. 



Villi: soft hairs or papillate processes: plural of villus ; q. v. 



Villose-ous: soft-haired or clothed with soft, short hair. 



Villus: a short, hair-like or papillate process on the surface of certain ab- 

 sorbent and sensory organs. 



Vinous: wine-color: a deep, transparent red-brown, like claret [purple 

 madder]. 



Violaceous: violet colored; a mixture of blue and red [violet carmine]. 



Virescent or Viridescent: greenish or becoming green. 



Viridis: green, like verdigris [French blue + chrome yellow + white]. 



Viscera: the internal organs of the body. 



Visceral: relating or attached to the viscera. 



Viscid: sticky: covered with a shiny, resinous or greasy matter. 



