286 



EXPLANATORY INDEX. 



Simulia, history of, 3 ; figured, 5 



Simuliites, an order of Diptera, 

 218 



Sirecites, an order of Hymenop- 

 tera, 241 



Sirex, a genus of Sirecites, 241 ; 

 figured, 230 



Skeleton of insects, 133 ; of large 

 water-beetle, figured, 133 



Skippers, Hesperites, an order of 

 Lepidoptera, 210 



Slow-legged beetles, Blapsites, 

 an order of Coleoptera, 247 



Smaragdinus, an intensely bright 

 gold green colour, 175 



Snake-flies, Raphidiites, an order 

 of Neuroptera, 269 



Social ants, Formicites, an order 

 of Hymenoptera, 231 



Social bees, Apites, an order of 

 Hymenoptera, 236 



Soft-winged beetles, Cebrionites, 

 an order of Coleoptera, 250 



Soldier-beetles, Pyrochroites, an 

 order of Coleoptera, 248 



Solitary ants. Mutillites, an order 

 of Hymenoptera, 231 



Sphecites, an order of Hymenop- 

 tera, 230 



Spheridiites, an order of Coleop- 

 tera, 254 



Sphexes, Sphecites, an order of 

 Hymenoptera, 232 



Sphingites, fly at twilight, 101 ; 

 exotic specimens of, often sup- 

 plied as British, 101 ; natural 

 order of Lepidoptera, 210 



Sphinx Vespiformis, an essay on 

 classification, 208 



Spiracula, the external apertures 

 of the tracheae, 192 



Spurge hawk-moth, Deilephila, 

 figured la. 90, im., 209 



Squameus, covered with distinct 

 scales, 177 



Squamosae, (alas) when covered 

 with scales, 165 



Stag-beetles, Lucanites, an order 

 of "Coleoptera, 252 



Staphylinites, an order of Coleop- 

 tera, 256 



Stephens, Mr., on a new mode of 

 killing insects, 114 



Sternellum, the name of the third 



section of the lower surface of 

 the segments of insects, 150 



Sternum, the under surface of the 

 segments of insects, 146 



Stigma, a portion of the wing, 167 



Stomach, ventriculus, functions 

 of, in insects, 185 



Stomoxites, order of Diptera, 221 



Stone-flies, Phryganiites, an order 

 of Neuroptera, 269 



Stramineus, a pale yellow, the co- 

 lour of straw, 174 



Stratiomites, order of Diptera, 225 



Straus-Durckheim's nomenclature 

 of the parts of the skeleton, 150 



Strength and importance of an 

 arch taught by the white ant, 88 



Striatus, when the surface is 

 marked with longitudinally im- 

 pressed lines, 176 



Strio-punctus, when the surface is 

 covered with punctures arranged 

 in longitudinal lines, 176 



Stylopites, an aberrant order of 

 insects, 271 



Sulcatus, when the impressed 

 lines are deep, resembling fur- 

 rows, 176 



Sulphureus, a pale delicate yellow, 

 the colour of brimstone, 174 



Sun-loving flies, Helophilites, an 

 order of Diptera, 226 



Surface of skeleton in insects, 171 



Syrphites, order of Diptera, 226 



Tabanites, order of Diptera, 220 



Tabanus, a genus of Tabanites, 

 221 ; figured, 216 



Tachydromiites, an order of Dip- 

 tera, 224 



Tarsus, the terminal portion of the 

 leg in insects, 170 ; figd. 169, a 4 



Tegula, the small tubercular plate 

 at the base of each fore wing in 

 Hymenoptera, 149 



Telum, the thirteenth or last seg- 

 ment of insects, 146 ; figured, 

 137, Y ; on the uses of its ap- 

 pendages, 171 



Tenthredinites, an order of Hy- 

 menoptera, 243 



Tephritis, a genus of Tephritites, 

 figured, 228 



Tephritites, order of Diptera, 227 



