loo AN A ceo [/NT OF BRITISH FLIES. 



case, I v/as unable to settle. The stomach passes into a small 

 intestine, which somewhat suddenly becomes inflated, the latter part 

 being the /arge intestine. The intestine is coiled several times, one 

 of the chief features of the whole alimentary tract being its great 

 elongation and also the same of its glands. The body cavity being 

 densely packed with adipose tissue. 



Fig. i6. — Alimentary Canal of Mycetid larva (Mycetophila). — a, (esophagus : 

 b, crop ; c, proventriculus; d, salivary glands ; c, stomach ; J\ small intestine ; 

 g, large intestine ; //, CKcal appendages (4 ?) ; ?', hepatic cix'ca. 



The Nervous System is composed of eight ganglia in Alycetopliila, 

 six in the body and two cerebral ganglia in the cerebral mass ; viz., 

 a supra- and infra-i esophageal united by a thin tract on each side. 



B. 



Fit;. 17. — a, head of an Asinduhim : l>, antenna of Asindulunt (hairs too long) ; 

 c, head of a Sciara. 



Chai'acters of tlie Family [Imago). 



Body elongated and compressed, often bare ; head small ; eyes 

 round or oval, ocelli present two or three in number, unequal 

 in size; palpi 4-jointed, cylindrical, the first joint very small. 



