784 



AN INTRODUCTION TO ENTOMOLOGY 



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r/;f hypopleural row. — A row of bristles extending in a more or less vertical 

 direction on the hypoplcura, usually directly above the hind coxas. They are 

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



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

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



group and the dorsoccntral 

 bristles (Fig. 1002, i. a). 



The intrahumeral bristles. 

 — These are the same as the 

 presutiu-al bristles. 



The marginal scutellar 

 bristles. — See the scutellar 

 bristles. 



The mesopleural row. — A 

 row of bristles inserted on the 

 mesopleurum, near its dorso- 

 caudal angle, or along its 

 caudal margin. (Fig. looi). 

 The metaplenral bristles. — - 

 A fan like row on the meta- 

 pleurum conspicuous in some 

 families but not found in the 

 Calypteratas. 



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 ppsthumeral 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 ol 

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



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

 the hindermost dorsoccntral 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, ms). 



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

 below the sternopleural sutiu^e and near it. 



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

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

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



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

 do, dorsoccntral; ds. dorsoscutellar; hm, hum- 

 eral; ia, intraalar; vis, marginal scutellar; 

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

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

 lower squama or calypter ; ti. sq. upper squama 

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

 and Johannsen.) 



