100 AN ACCOUNT OF BRITISH FLIES. 
case, I was unable to settle. The stomach passes into a smal/ 
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 adzpose tissue. 
Fic, 16.—Alimentary Canal of Mycetid larva (Mycetophila).—a, cesophagus ; 
6, crop; ¢, proventriculus; @, salivary glands ; e, stomach ; /, small intestine ; 
g, large intestine ; 4, cecal appendages (4 ?); 2, hepatic czeca. 
The WVervous System is composed of eight ganglia in AZycetophila, 
six in the body and two cerebral ganglia in the cerebral mass ; viz., 
a supra- and infra-cesophageal united by a thin tract on each side. 
Fic. 17.—a, head of an Asindulum ; 6, antenna of Asindulum (hairs too long) ; 
¢, head of a Sciara. 
Characters of the 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 q-jointed, cylindrical, the first joint very small. 
