272 



PHILIP P. CALVERT. 



Spiracles, abdominal 170, 



179, 202, thoracic 161, 



180, 202 

 Sponsa 189 

 Stenophlebia 168 

 Sterna, abdominal 169- 



70, 198, thoracic 159 60 



Stipes 157 



Subcosta 163 



Subcostal cross-veins 169 



Submedian vein 163, 165 



Subnientalis 172 



Subnodal sector 163 



SubcBsophageal ganglion 

 182 



Subtriangnlar space 165 



Subulicoruia 210 



Superior appendages 170, 

 198, 212 



Supinators 174-5 



Supplementary sectors 

 169 



Supra-cesopbageal gang- 

 lion 181 



Supratriangulars 169 



Supratriangularspacel65 



Suture, humeral 159, 1st 

 and 2d lateral 160 



Sympathetic nerves 184 



Sympetrum 262 



Sympycua 204 



Synonymic changes 269 



Tachoptery X 212, 221 , 241 

 Tseniolata 250 

 Tarsophlebia 162 

 Tarsus 162, 196. 198 

 Taste, organs of 184 



Tel son 169 

 Temperature, effects of 



204 

 Tendons 171 

 Tenera 265 

 Teneral 203 

 Tensors 174-5 

 Terga, abdominal 169, 



198, thoracic 159 

 Testes 184 

 Tetragoneuria 223, 227, 



252 

 Thecaphora 246 

 Thorax, skeleton 158-69, 



muscles 172-.5, nerves 



182, development 193, 



195, 197 

 Thorevi 241 

 Tibia 161 

 Tibialis 233 

 Trachea? 178-9, 196, 199- 



200 

 Tracheal-gills 194, 196, 



198, 200-2 

 Tramea 170, 223, 227, 255 

 Transversa 250 

 Transverse abd. carinfe 



170 

 Triangle 165, 213, sectors 



of 164 

 Tricolor 225 

 Trimaculata 180, 189, 



190, 259 

 Trochanter 161 

 Tuberculatum 240 



Ultra-nodal sector 169 

 Uncata 230 



Uuguiculata 230 



Vagina 186 



Valve, genital 186, 199 



Valvular process 186 



Vas deferens 184. 199 



Vastus 245 



Ventral plate 191 



Vertex 155 



Verticalis 189, 190, 196, 



239, 248 

 Vesicle of penis 185 

 Vi brans 257 

 Vicina 264 

 Vigilax 232 

 Viliosipes 244 

 Vinosa 247, 267t 

 Violacea 189. 233 

 Virgo 185, 190, 205 

 Vitelline membrane 190 

 Vulva 170, 186 

 Vulvar lamina 170, 186, 



199 



Water in which nymphs 



live, nature of 204 

 Weights of O. 173 

 Wing-covers 197, 199 

 Wings 162-9, 173, mus- 

 cles 172-5, 199 



Yolk 191, 193, 194 



Zoogeographical provin- 

 ces 208 

 Zygoptera 219, 225 



EXPLANATION OF PLATES. 



PLATE II. 



Figs. 3-6. Profile views, leftside, of the external genital organs on the ventral 

 surface of the second abdominal segment of the males of Diplax 

 semicincta, vicina, rubicundula and obtrnsa. Seen when the insect is 

 turned upside down, al anterior lamina, ibh internal and ehh ex- 

 ternal hamular branch, gl genital lobe, vp vesicle of the penis. 



Fig. 7. Labium of imago, S of mature nymph of Calopteryx maculata. sm^ sub- 

 mentum, m subglossa?, ml median lobe, II lateral lobes, tp terminal 

 palp, s half of raentum ?. 



Figs. 9, 10. Half of the front portion of labium of very young nymphs of Anax 

 Junius and Libellnln pulchella. Letters as before. 



Fig. 11. Front view of head of Gomphns exilis. 



Fig. 12. A nearly horizontal section of the thorax o^ Aeachna constricta showing 

 the wing muscles. 



Fig. 13. Right side of the thorax of Hetierina americana. 



PLATE m. 



Figs. 14-21, 24 Dorsal viewsof terminal abdominal appendages of the males of va- 

 rious sjiecies of Lestes. The right superior appendage is omitted. 



Figs. 22, 25. Dorsal views of the superior appendages of males of Enallagma 

 Hngeni and divagnns. 



Figs. 23, 26-32. Profile views right side, of the terminal abdominal appendages 

 of the males of various species of Enallugmn. 



