260 MANUAL OF NATUEAL HISTORY. 



proboscis distinct, short, membranous, end- 

 ing in two large labial lobes, entirely retrac- 

 tile, and enclosing only two pieces or setiform 

 organs j body short, robust ; abdomen not in- 

 flexed at end ; wings and legs moderate. 

 Feed on various substances both living and 

 dead. 



32. FAMILY. Gad-Flies (GEstridae). Antenngevery 

 short, terminal joint rounded, emitting a seta ; 

 proboscis rudimentary or obsolete, consist- 

 ing of two or three minute fleshy tubercles ; 

 wings divaricate, winglets very large, hiding 

 the balancers, nervures few. Large hairy 

 flies, often coloured in transverse bands ; 

 parasitic on different species of mammals. 

 Larvae termed " bots." 



III. TEIBE. HYPOCEROUS-FLIES (Hypocera). 



Antennae near epistome, with a single inconspicu- 

 ous joint, and an arista ; mandibles and maxillae 

 obsolete. 



S3. FAMILY. Phoridean - Flies (Phoridse). Palpi 

 porrect, without joints ; wings with anterior 

 veins strong, costal ending about middle of 

 rib, posterior very thin, simple, disunited ; 

 coxae and femora thickened, compressed. 



II. SUB-ORDER. EPROBOSCTDEAN-FLIES (Eproboscidea). 



Head immersed in thorax ; claws denticulated ; 

 legs distant ; larvae nourished in body of parent 

 until it has passed the pupa state. 



