CHAPTER XXXIII 



DIPTERA {concluded) 

 MUSCID^ AND ALLIED FAMILIES 



Flies — Orthorrhapha — Bracliycera- — Tabanidae — Leptidge — Asilidae — Phoridse 

 — Scenopinidse — Empidae— Cyclorrhapha — CEstridse — Sarcophagidse ■ — ■ 

 Muscidse — Anthomyidae — Pupipara — References. 



BITING AND PARASITIC FLIES. 



This chapter deals with all those insects which come under the 

 term ' biting and parasitic flies/ In medicine they are of importance 

 because of their blood-sucking habits, through which they are able 

 to disseminate animal parasites. Further, the larvae of certain 

 species may enter the skin or the alimentary canal, and cause 

 irritation and disease in this way {Myiasis Hope, 1837). 



Continuing the classification of the Diptera already given, the 

 first section included in this chapter is that known as the Brachy- 

 cera. 



SUBORDER I. ORTHORRHAPHA. 



SECTION BRACHYCERA. 



The principal Orthorrhapha Br achy cer a may be divided into two 

 groups : — ■ 



Group i: Brachycera Homceodactyla. — Imago with pulvilliform 

 empodia. Larvae with a terminal posterior stigma. Families: 

 Tabanidae, Leptidae, Stratiomyidae. 



Group 2: Brachycera Heterodactyla. — Imago with empodia un- 

 developed or bristle-like. Posterior stigma of the larva not ter- 

 minal. Families: Asilidae, Empididae. 



BRACHYCERA HOMCEODACTYLA. 



The families with which we are concerned may be recognized as 

 follows : — ■ 



A. Antennae composed of more than five joints, or third joint 



complex. 

 I. Squamae loiTge—TahanidcB. 

 II. Squamae small. 



Tibia with spurs — Leptidce in part. 



B. Antennae composed of three joints or third joint simple — 



LeptidcB in part. 



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