•^ EXPLANATION OF PLATES. 



Crickets, Gn/llidm, from within, t, Membrane ; m, muscle attached ; n, nerve 

 servmg it with ramifications. (From Herr Vitis Graher.) 



Fig. 10. View of the membrane, t, from without ; after Dr. Landois. 



Fig. 11. System of circulation in the abdomen of a Privet Hawk Moth, 

 Sphinx Ligustri. li. Dorsal canal; c, ventral canal; a, vessel in which they 

 unite ; a, afferents ; s, intestines ; t, t, t, tracheae ramifying around the lower 

 vessel. 



Fig. 12. Organ of stridulation in the Chafer, Serica hrunnea. I, Lima. 



PLATE VII. 



THE NERVOUS SYSTEM IN THE VARIOUS ORDERS OF INSECT. 



Fig. 1. Nervous system in Cicada orni; after Leon Dufour. n, Auditory 

 nerve. 



Fig. 2. Nervous system in the Grasshopper, Epacromia Thalassina. n, Audi- 

 tory nerve. 



Fig. 3. Nervous system in the Ecd Underwing Moth, Caiacala Nupta. 

 n, Auditory nerve. 



Fig. 4. Nervous system in a Dung Beetle, Geotrupes stercorarius. n, Audi- 

 tory nerve. 



Fig. 5. Nervous system in Drinker Moth Caterpillar, Odonestis potatorla. 

 Dotted Ganglions. 



