844 INSECTS. 



Mr. Walker divides NEMOCERA into the following 

 families : 



1. Mycetophilidae, 



2. Cecidomyzidae (Gall-gnats). 



3. Bibionidae. 



4. SimulidaB (Sandflies). 



5. Chironomidae (Midges). 



6. Culicidae (Gnats). 



7. Phlebotomidae. 



8. Heteroclitae. 



9. TipulidaB (Daddy Longlegs, Craneflies). 

 10. Khyphidaa. 



In the three first of these familiies the larvae are 

 terrestrial, living on fungi, roots ot grain, &c., and dead 

 organic matter. The perfect Flies are not blood-suckers. 



1. Mycetophilida3. These, as their name denotes, 

 live chiefly upon fungi, partly also (as is common with 

 fungus-eating insects) on decaying vegetable matter of 

 other kinds. They are little, active, hopping creatures, 

 in general appearance like minute and beautiful Gnats, 

 Iroui which, however, the shortness of the proboscis and 

 the comparative shortness of the legs serve to distinguish 

 them. They are further to be distinguished as usually 

 possessing ocelli, two or three in number Bibionidae, 

 and, rarely, Cecidomyzidae being the only other families 

 of Nemocera with ocelli. 



The wings are without the discal areolet. 



2. Cecidomyzida. These are also very small and 

 exquisitely beautiful Gnat-like little insects, with glitter- 

 ing rainbow-coloured wings, and often with long, slender, 

 and decorated antennas. They seldom have ocelli. The 

 Gall-making larvae are found in this family, while others 

 feed in the seed-vessels, flowers, leaves, &c., of living 



