DESCRIPTION OF THE PLATES. 
Plate 1,--Fig. 1. A small portion of the eye of Libellula depressa. 2. Antenna 
14, 
2 
of Agrion puella. 3. Antenna of Aishna maculatissima. 4. Antennaof 
Libellula depressa. 5, Mandibles of Aishna maculatissima. 6. Max- 
ille of Libellula depressa. 7. Labrum of Libellula depressa. 8. La- 
bium of Libellula depressa, 9. Apex of abdomen of Calepteryx hcemorr- 
hoidalis, male. 10. Part of abdomen of ditto. a, Opening to sexual 
organ. 11. Lamellated appendage of Aushna maculatissima. 11a. Lamel- 
lated appendage of Gomphus flavipes, (from Stephen’s “ Illustrations of 
British Entomology.’’) 12, Apex of abdomen of Libellula depressa, 
male. a. Opening to sexual organ, 13. Tarsi of Agrion furcatum, 
Tarsi of Libellula depressa. 15. Tarsi of Aushna maculatissima. 16. 
Prehensile organ of male Libellula, @ moveable hooks encompassing 
the points * of the process & ; ¢ processes of the 2nd division of the organ, 
between which the hook d lies. e. 3rd division of the organ, (from 
Shuckard’s Translation of Burmeister.) 17. Breathing apparatus of 
#ishna. 17a. The same open. 18. Mouth-piece of Libellula depressa, 
side view. 18a. The same, front view. 180. The same, underneath. 
19, Larvaof Calepteryx. 20. Larvaof Aishna, 21. Larva of Libellula. 
.—Fig. 1. Upper wing of Agrion puella. 2. Upper wing of Libellula de- 
pressa. 3. Principal nervures of the upper wing of Agrion. 4. Of the 
upper wing of Calepteryx. 5. Of Aishna. 6. Of the under wing of 
fishna. 7. Of the upper wing of Libellula. 8. Of the under wing of 
Libellula. 
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