.1 Monograph o/ Egyptian Diptera. 



THORAX 



With a tliarae-teristic chaetotaxy on the dise and pleiirae, when 

 it is said to be complète chaetotaxy ; in a few cases, however, 

 some bristles are absent and the chaetotaxy is then reduced or in- 

 complète. A complète chaetotaxy consists of 2 pairs of scapular, a 

 pair of dorso-central, a pair of praeseutellar, 1 humerai, 2 noto- 



pali.us; Pi 



ma; G. : gêna or clieek; 

 v(. : pos't-vertical bristle; 

 sties; oc. : oeellar linùstle; 

 thorax; M. : nietaplleura; 

 nisphr. : nieîopliragma; 

 : halter; A. St. : anterlor 



mlddle and hind legs; 



lim. : humerai lirisKe; 

 bristle; p.npl. : posterior 

 sa. : posterio7' supra-a'lai' 

 lar hristle; a. se. : apical 

 eural ibristle; pf. : ptero- 



pleural, 1 praesutural, 3 supra-alar, 1 or 2 mesopleural, 1 ptero- 

 pleural and 1 sternopleural. 



SiYipiiIar (sep.) are two pairs of small bristles on the anterior 

 margin of the thorax, sometimes indistinct but never obsolète; one 

 pair is médian or acrostichal and the other latéral or dorsocentral. 



Dorsocentral (de.) consists of usually one pair (very rarely 

 2 pairs) in the dorso-central région between the transverse s'iti.re 

 and the scutellum, sometimes entirely absent. 



