652 DESCRIPTIONS OF PLATES. 



of Pimelia (ib.). Fig. 17, Ditto and duct of Lytta vesicatoria (Brandt), 

 a, Testes. b, First gum -vessel, b b, Second ditto. *, Bag-shaped distension 

 at the connecting point of the duct. Fig. 18, Testes of Lamia cudilis. Fig. 19, 

 Ditto of Prionus (L. Duf.), Fig. 20, Ditto of Cicada (ib.). 



PI. XXX. Fig. 1, Testes of Nepa cinerea (Swamra.). Fig. 2, Ditto of Melo- 

 lontha vulgaris (Suckow). Fig. 3 } Auxiliary testes of Hydroph. piceus (ib.). 

 Fig. 4, Ditto of Locusta viridissima. a, Superior fasciculus of vessels. b, 

 Retainer, clothed on the surface with small processes, into which the duct, c, 

 opens, d, Sperm bladder. Fig. 5, Ducts of the genitalia of Donacia aquatica 

 (Suckow), without appendages. Fig. 6, Ditto of PJiryganea oleracea. a, Vasa 

 deferentia. 6, Vesica seminalis. Fig. 7, The same of Dyticus margindlis, 

 marked the same. Fig. 8, The same of Apis mell. (Brandt), a* *, Vesica 

 seminalis. b b, Clavate gum-vessels. Fig. 9, The same of Melolontha vul- 

 garis (Suckott). a a, Ducts of the vesica seminalis. b b, Gum-vessels, with 

 their distension. Fig. 10, The same of Hydrophilus piceus (ib.). a a, Vasa 

 deferentia. a* a*, Vesica seminalis. a a, Ends of the auxiliary testes. 

 b* b*, The first furcate gum-vessel, b b, The second simple ones. Fig. 1 1 , The 

 same of Lamia cedilis. a a, Vesica seminalis. b, Furcate gum-vessel, with 

 unequal branches. Fig. 12, Organs of Vanessa Urticce, male (Swamm.). 

 a, United testes. a* a* Vasa deferentia, into which the gum-vessels, b b, 

 open. Fig. 13, Gum-vessel of Calosoma sycophanta (Suckow). a, Vasa 

 deferentia of one side, which opens into the gum-vessel (bb)of the side, that 

 of the other side and the ductus ejaculatorius is cut off. Fig. 14, Ducts of 

 the genitalia of Tipula croeata (Suckow). a a, Vasa deferentia. b, Gum- 

 vessels. 



PI. XXXI. Fig. 1, A portion of the hard membrane of the brain of Dyticus 

 marginalia. Fig. 2, Brain of the caterpillar of Cossus Ugniperda (Lyonet). 

 A, Cerebrum. B, Cerebellum, aa, Nerves of the eyes, b b, Of the antenna, 

 e, Cord round the resophagus, proceeding from the cerebrum, d d, Cord con- 

 necting the cerebrum and cerebellum, e e, Nerves of the mandibles, the 

 branches of the second nerve of the lip (yg), whence a branch for a muscle, N, 

 originates. //, Nerves of the maxilla?. </#, Second connecting nerve of the 

 labium, of which the nerve of the mandible is a branch, g* g*, First nerves 

 of the labium, which give off a branch, M, to the muscles of the maxillae. 

 O O, Nerves of the muscles of the mandibles and antennae. P P, Nerves of the 

 muscles of the mandibles. R R, Nerves that distribute themselves at the 

 posterior portion of the skull. S S, Nerves of the muscles of the neck, which 

 pass into the thorax. V V, Connecting cords of the cerebellum and first 

 thoracic ganglion. D, The frontal ganglion, formed of the two branches, E E, 

 whence the sympathic nerve, F, originates. Fig. 3, Cerebrum of the same 

 caterpillar (ib.). E E, Branches to the frontal ganglion. O, Nerve of the 



