DESCRIPTIONS OF PLATES. 643 



of the posterior legs. Fig. 2, Lateral view. A, Scale-shaped pronotum. 



B, Prosternum. a, Cavity in which the first spiracle lies. C, Mesonotum. 

 c, Scutellum. D*, Patagium. D, Scapula. E, Mesosternum. , Cavity 

 of the second spiracle. F, Metanotum. G, Metasternum. K K K, Coxae. 

 [No. 5,] Thorax of Cicada Fraxini. Fig. 1, View from above. A, Pronotum. 



C, Mesonotum. c, Scutellum. d d, Frenum. F F, Metanotum. Fig. 2, 

 View from beneath. B, Prosternum. E, Mesosternum. G, Metasternum. 

 ft ft, Scales beneath each of which the second spiracle of the thorax lies. 

 [No. 6,] Thorax of Lyyceus equestris. Fig. 1, Prothorax from above. Fig. 2, 

 The same from beneath. Fig. 3, Meso- and metathorax from above. 

 C, Mesonotum. c, Scutellum. Fig. 4, The same from beneath. E, Meso- 

 sternum. ft ft, Cavities covered by scales, beneath which the spiracles lie. 

 G G, Metasternum. 



PI. XIV. [No. 1,] Thorax of Tabanus bovinus. Fig. 1, View from above. 

 d d, Protrusions which take the place of the patagia. Fig. 2, View from the 

 side, a, First spiracle, indicating the boundary of the prothorax. B, Situation 

 of the prosternum. C, Mesonotum. c, Scutellum. d, The patagium. 



E, Mesosternum. R, Base of the wing. S, Scale. F, Metanotum. 

 G, Metasternum. T, Poiser. ft, Second spiracle. H, Metaphragma 

 K KK,Coxa3. [No. 2,] Thorax of Myopa tcstacca. Fig. 1, View from above.' 

 A A, Protrusions which indicate the prothorax (humeri of entomologists). 

 C C, Mesonotum. c, Scutellum. S S, Scales. T T, Poisers. F, Meta- 

 notum. Fig. 2, Lateral view. A, Humerus. a, First spiracle. C, Meso- 

 notum. c, Scutellum. E, Mesosternum. S, Scale. F, Metanotum. 

 G, Metasternum. T, Poisers. ft, Second spiracle. H, Metaphragma. 

 [No. 3,] Thorax of Semblis bicaudata. Fig. 1, Prothorax from above. Fig. 2, 

 The same from beneath. B, Prosternum. a a, Place of the first spiracle. 

 K K, Acetabula?. Fig. 3, Meso- and metathorax from above. C, Mesonotum. 



F, Metanotum. Fig. 4, The same from the side, with the same indications. 

 Fig. 8, Pincers of a Forficula (De G.). Fig. 9, A Smynthurus seen from 

 beneath (De G.). a, The fork which produces the leap, b, Process upon the 

 mesosternum whence the filaments proceed. Fig. 10, Apex of the abdomen of 

 Staphylinus erythropterus. aa, The hairy styli. Fig. 11, Apex of the abdomen 

 of Blatta orientalis. a a, The circi. b b, Two other processes which proceed 

 from the ventral plate, c, The male organs withdrawn. Fig. 12, Apex of 

 the abdomen of a male Ephemera, a, The penis, b b, The two fangs which 

 are seated on the ventral plate, c c, The jointed fila proceeding from the 

 dorsal plate, the half of which is cut off. Fig. 13, Apex of the abdomen of 

 Machilis polypoda (Dumeril), with the hairy setae. Fig. 14, Apex of the 

 abdomen of Aphis, a a, The siphunculi. 



PI. XV. N. B. The t\\o arrows at the base of the wings indicate the course 



