90 INVERTEBRATE ANIMALS. 



House-flies, Antliomyia ; Hoverers, Syrphi- 

 d(e ; Gad-flies, Tahanidcs. 



Fleas, PtiUcidce, are inserted in this group because 

 of their resemblance to certain two-winged flies found 

 near the roots of trees in woods, Mycetophilidce, the 

 larvse of which infest various species of Agaricus and 

 other fungi. 



Observe the eyes in Diopsis set at the ends of foot- 

 stalks ; the hymeuopterous aspect of Mydas giganteus 

 and the extended proboscis of Pangonia, capable it is 

 said of piercing the hide of cattle while the insect is 

 still on the wing. 

 Series of British species presented by Benjamin Cook. 



Upper Compartment. 

 The African Tsetze, Glossina momitans. 



Order LEPIDOPTERA. \f.7:ig, a scale; ^tbpov, 

 a wing. Wings four, covered on both sides with minute 

 imbricated scales. Estimated number of species, 24,000 

 (Bentham). 



The works used in naming and arranging the 

 series were numerous. Those of especial service were 

 " PapiUons Exotiques,'" Cramer and Stoll, 5 vols. 4to. ; 

 " Sammlung Europmsclier Schmetterlinge,'^ J. Hiibner, 

 9 vols. 4to.; '^Genera of Dkirnal Lepidoptera,'' 

 Doubleday and Westwood, 2 vols. imp. quarto; and 

 the works of W. C. Hewitson. 



Division HETEROCEEA, hispog, difl"erent; nepug, 

 a horn. This division includes all the insects of the 

 order except Butterflies. 



