DESCRIPTIONS OF PLATES. 647 



b A, which unite to form the sphincter of the stomach. Fig. 1 1 , Orifice of the 

 stomach of Lamia cedilis. a a, Four teeth, which have two fine horny ridges. 

 b b, Ridges of the crop, c, Veutriculus. Fig. 12, Salivary vessels of Locusta 

 viridissima. a, Tongue from beneath, b b, Outlets of the glands, c c, Glands. 

 Fig. 13, Mandibles and salivary vessels of the caterpillar of Gastropacha Pini 

 (Suckovv). a, Mandible, b, Gland, aperture of the salivary vessel, c, Muscle 

 of the mandible, d d, Salivary vessel. Fig. 14, Urinary organ of Dyticus 

 marginalis. a a, Secreting vessel, kidney, b, Urinary bladder, r, Evacuating 

 duct. Fig. 15, Salivary vessels of Reduvius personatus (Ramd.). a, OZso- 

 phagus. b, Duct of the salivary glands, c c, Longitudinal glandular bodies. 

 Fig. 16, Salivary vessel of Pulex (Ramd.), vesicular glands, b, Excretory 

 duct. 



PJ. XXII. Fig. 1, Single salivary vessel of Nepn cinerea (Ramd.). a, Duct. 

 b, Glands, c, Glandular vessel. Fig. 2, Second salivary vessel of ditto 

 (ib.). ab, Double duct of the auxiliary gland, d, Auxiliary gland, ee, Chief 

 gland. Fig. 3, Salivary vessel of Blaps (Leon Duf.). Fig. 4, Ditto of 

 Tabanus (Ramd.) Fig. 5, Ditto of Cicada (Leon Duf.). Fig. 6, Ventral 

 salivary glands of Leptis (Ramd.). a a, The two glandular bags, b, CEso- 

 phagus. c, Outlet of the sucking stomach, d, Commencement of the veutri- 

 culus. Fig. 7, Ventral salivary glands of Bombylius (ib.), the same. Fig. 8, 

 Ditto of Chrysotoxum (Ramd.), the same. Fig. 8*, Lateral view of the heart 

 of Melolontha vulgaris (Straus-Durck.). a a, Orifices of the heart, 12. 

 <JF, Ventriculi. B, End of the heart. C, Aorta. Fig. 9, Commencement of 

 the heart, with the muscular wings (ib.). a a, Muscular wings, b b, Orifices 

 in them, in front of each aperture of the heart. Fig. 10, Spiracle of the 

 abdomen of Dyticus marginalis. Fig. 11, Portion of a trachea, a a, External 

 tunic. b b, Spiral filament which forms the second tunic. cc, Third, or 

 mucous tunic. Fig. 12, A portion of the tunic of the air-bag of Musca 

 vutnitoria, very much magnified. 



PI. XXIII Fig. 1, Spiracle of Oryctes nasicornis, seen from the front, a a, 

 The projecting margin, b b, Horny plates, which form its lips, c, Aperture. 

 Fig. 2, The same, removed from the contiguous parts, and seen from the side, 

 a, Projecting margin. b b, The separated integument in the vicinity of the 

 spiracle, c c, Posterior projecting margin of the spiracle, dd, The two horny 

 triangles, which lie on one side of the main stem of the trachea, which join 

 at *, and are moved by the broad muscle, e. fff, Branches of the trachea?. 

 Fig. 3, The same, from beneath, a a, External projecting margin, b b, Sepa- 

 rated integument, c, Spot where the apex of the lower triangle articulates with 

 the margin of the spiracle that projects inwardly, d, The lower horny triangle. 

 fff, Steins of the trachea. Fig. 4, Spiracle of the larva of Cetonia auraia. 

 a a, The external darkly-coloured margin, which is decorated with paler ellip- 



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