784 



AN INTRODUCTION TO ENTOMOLOGY 



ds-: 



The hypopleural roiv. — A row of bristles extending in a more or less vertical 

 direction on the hypopleura, usually directly above the hind coxae. They are 

 sometimes grouped into a tuft. (Fig. looi). 



The inner dorsocentral bristles. — These are the acrostichal bristles. 

 The intraalar bristles. — A row of two of three bristles between the supraalar 



group and the dorsocentral 

 bristles (Fig. 1002, i. a). 



The intrahumeral bristles. 

 — These are the same as the 

 presutural bristles. 



The marginal sciitellar 

 bristles. — See the scutellar 

 bristles. 



The mesopleural roiv. — A 

 row of bristles inserted on the 

 mesopleurum, near its dorso- 

 caudal angle, or along its 

 caudal margin. (Fig. lOOi). 

 The metapleural bristles. — • 

 A fan like row on the meta- 

 pleurum conspicuous in some 

 families but not found in the 

 Calypteratae. 



The notopleural bristles. — 

 Usually two bristles, inserted 

 immediately above the dorso- 

 pleural suture, between the 

 humeral callus and the root 

 of the wing, on the noto- 

 pleura. (Fig. 1002, n p I), 



The postacrostichals. — See 

 the acrostichal bristles. 



The postalar bristles. — - 

 Bristles on the postalar callus 

 back of the supraalar bris- 

 tles. (Fig. 1002, pa). 



The posthnmeral bristles. 

 — One or more bristles situated on the prescutum near the inner margin of the 

 humeral callus. (Fig. 1002, ph.) 



The preacrostichals. — See acrostichal bristles. 



The prealar bristle. — A bristle found in the Anthomyiidae inserted just back of 

 the transverse suture in line with the supraalar bristles. (Fig. 1002, pra). 



The prescutellar row. — A row of bristles in front of the scutellum consisting of 

 the hindermost dorsocentral and the acrostichal bristles. 



The presutural bristles. — One or more bristles situated immediately in front of 

 the transverse suture, above the presutural depression. (Fig. 1002, pr.). 



The propleural bristles. — A bristle or bristles inserted on the lower part of the 

 pleurum of the prothorax, immediately above the front coxa. 

 The prothoracic bristle. — The same as the propleural bristle. 

 The pteropleiiral bristles. — Bristles inserted on the pteropleura. 

 The scutellar bristles. — (a). The dorso-scutellar bristles., usually a single pair of 

 bristles, borne on the dorsal portion of the scutellum, one on each side of the 

 median line, slightly behind its middle. (Fig. 1002, ds). (b) The marginal scu- 

 tellar bristles, usually a distinct row of large bristles borne on the margin of the 

 scutellum (Fig. 1002, ni-s). 



The sternopleural bristles. — One or several bristles on each sternopleurum 

 below the sternopleural suture and near it. 



The supraalar bristles. — Usually one to four bristles above the root of the wing, 

 between the notopleural and the postalar bristles. (Fig. 1002, sa). 

 The trichosticnal bristles. — The same as the metapleural bristles. 



n/>l pre 



Fig. 1002. — Thoracic bristles: a, acrostichal; 

 dc, dorsocentral; ds. dorsoscutellar; hm, hum- 

 eral; in, intraalar; ms, marginal scutellar; 

 npl, notopleural; pa, postalar; ph, posthum- 

 eral; pr. presutural; sa, supraalar; /. sq., 

 lower squama or calypter; u. sq. upper squama 

 or calypter; w. b, wing-base. (After Riley 

 and Johannsen.) 



