PLEURAL CHAETOTAXY. 



17 



roughly indicated in the diagrams by the size of the dots. 

 Generally speaking the largest bristles are the lowest humeral, 

 the notopleural, supra-alar, post-alar, the bristles of the transverse 

 row formed by the first and inner dorso-centrals, and the 

 marginal and apical scutellar bristles. 



Pleural aspect (Fig. 10). — Prothoracic, 1. Stigmaiic (cf. 

 Becker, Berl. Ent. Z. xxxix (1894), p. 83), 1. Mesoplcural, a 



Treesutural dorso-central Bristle^ 

 PrcBSutural Bn5tle^_ 



Humeral 

 Bristles "^----v,^ 



Notopleural 

 Bristles . 



Prothoracic .,-' 

 stigma ■'' 



Prothoracic ,.-■'-'' 

 Bristle '','-' 



Stigma tic Bristle 



f3echer. Berl Ent.Z. 

 xxKiK (legfj.pM.) 



/lesopleural Bristles '"' ,-' 

 Anterior Sternopleur'al Bristle 



Supra-alar Bristle 2'"'dorso centtai Bristle 



Intra-alar Bristle / T'dorsocentral 

 ..--''.'.---" Bristle 



Scutellar Bristles 



^ ( marginat and apical } 



1/ Pas ten or Stemopleura I Bristles 



iPterop/eural Bristles 



Fig. 10. 

 Diagram of thoracic cliaetotaxy of Glossina, pleural aspect. (X 10.) 



vertical row of about 6 along the posterior edge, with smaller 

 bristles in between. Pteropleural,* a vertical row of usually 3, 

 with smaller bristles on either side. Sternopleural, 3, — 1 anterior, 

 and 2 posterior : below, a conspicuous row of bristles in front of 

 the middle coxae. HypopAeural, none. 



* Pteropleural bristles seem to be entirely wanting in Stomoxys, 

 Haematobia, and other genera of the Muscinae. 



c 2 



