Antigcny. — A term sometimes useil to denote sexual climorpbism. 



Antisqtiama. ") „ 

 . ,., , \ bee bf/iiama. 

 Aiititegula. J '' 



Apex, apical. — The part of an organ, segment, etc., which is most distant from 

 an imaginary point lying between the thorax and abdomen of an insect, 

 such as the tip of the abdomen, the last joint of the leg, antenna or 

 palpus. Opposed to base, basal. 



Arista. — The terminal bristle, sometimes very long, on the last joint of the 

 antenna. Occasionally it is two-jointed, but this is perceptible only 

 under high magnification. It is practically absent in the Orthou- 

 EiiAriiA, though quite general in the CyCLORRiiAPnA. In only one very 

 small family (the Orpiineimiilid.e) of the NematocerA is there any 

 approach to it ; the antennal flagellum in this group being aristiform. 

 The arista may be pectinate (/. e. with strong hairs, few in number, on 

 its upper and lower sides), pubescent, or plumose (when the hairs are 

 long and placed closely together, forming so to speak a large feather). 

 In nearly all such cases the hairs are more abundant on the upper- 

 side. In many groups it is quite bare. 



Axillary cell.— See pp. 8 and !.'>. 



Axillary veiii. — Uhe 7th longitudinal rein, or wlien the venation is reduced 

 it is applied to the vein behind the anal vein, but in many cases it is 

 absent. 



Barba, or heard. — Practically absent in the Nematocera. The long hair on the 

 lower side of the face and head, conspicuous in the Asii.id.e ; often 

 joined without interruption to the mysfax* or the hair on the cheeks. 

 The older authors used the term mystax or barba for all the hair on the 

 head below the level of the anteunse. 



£ase, basal. — A^jplied to that portion of an organ, segment, etc. which lies 

 nearest to an imaginary point between the thorax and the abdomen 

 of an insect ; as opposed to distal, apical, and apex. 



Bombyliviorpha: — A superfamily used by Brauer and Bezzi for the Cyujid.k 

 (Achocerid.e) and Nemestrinid.e together. 



Brachycex^halous. — Having the head wider than it is long. 



Callus, calli. — More or less distinct swellings on various parts of the body, 

 generally on the thorax ; in some families (especially in TabaniDve) on 

 the frons or vertex. (See p. 5.) 



Calyptcr, calypiron.See Sqtiamce; also p. 16, note. 



Calyptrata. — A division of the great family Muscid.e, embracing about half 

 the known species, including all those in which the squamae are large, 

 easily visible, and distinctly different in size ; as opposed to tiie 

 AcALYPTRATA, iu which they are very small, practically equal in size 

 (the upper and lower scale), or absent. The Calyptrata comiiri^e 

 the Taciiinin.e (including the DEXiiNiE and Sarcopiiagin.e), Muscix.e 

 and Anthomyin/E. See Acalyi)irata. 



Cells. — For full description, see pp. 8 and 13. 



* Literally, moustaclie. 



