158 ENTOMOLOGY FOR MEDICAL OFFICERS 



animals, however, they are something more than casually 

 harmful, since several of them besides Glossina have been 

 proved to " carry " dangerous pathogenic micro-organisms. 



As regards their method of breeding : that of Glossina is 

 distinct, and is remarkably like that of the Pupipara ; but in 

 all the other blood-sucking Muscidae the breeding habits and 

 mode of reproduction, so far as is known, are like those of the 

 house-fly, and the usual pabulum of the larvae is the dung of 

 herbivorous animals. 



Table of Blood-sucking Muscidae. 



Arista feathered dorsally only, the individual hairs being also 

 feathered. Proboscis with a bulbous base and very slender 

 shaft. Maxillary palps long and slender, embracing the pro- 

 boscis like a sheath. Fourth longitudinal vein curved in its 

 proximal portion, so as to enlarge the anterior basal cell dis- 

 tally and to contract the discal cell basally ; and sharply bent 

 forwards in its distal portion in line with the posterior cross- 

 vein, so as nearly to close the ist posterior cell at a point much 

 anterior to the tip of the wing. Abdomen composed of 7 

 visible segments Glossina. 



Hairs of arista not feathered. Shaft of proboscis not remarkably 

 slender. Maxillary palps not forming an obvious sheath for 

 the proboscis. Fourth longitudinal vein not remarkably 

 sinuous in its proximal portion, and curved or bent forwards 

 in its distal portion at a point considerably beyond the posterior 

 cross-vein. Abdomen composed of 4 visible segments = 2 



Maxillary palps slender, less than half the length of the proboscis. 

 [Arista feathered dorsally only. Third longitudinal vein with 

 some bristles on its proximal part] = Stomoxys. 



Maxillary palps more or less spatulate, almost as long as the pro- 

 boscis, or at any rate very much more than half its length = 3. 



Proboscis chitinous in all its extent, the labella small = 4. 



Proboscis with the distal part (and the large labella) fleshy. 



[Arista feathered dorsally and ventrally : 3rd longitudinal 



vein not bristly : 4th longitudinal vein abruptly bent as in 



Musca so as nearly to close the 1st posterior cell] = 8. 



/Aiista feathered dorsally only = 5. 



I Arista feathered dorsally and ventrally = 6. 



'Proboscis long and tapering : 4th longitudinal vein gently curved 



in its distal part so as to leave the ist posterior cell widely 



open : 3rd longitudinal vein without bristles = Lyperosia. 



Proboscis short and stumpy : ist posterior cell narrowly open : 3rd 

 longitudinal vein with some bristles proximally 



= Stygeromyia. 



