signatum, 328, 329 
simile, 314 
simplicicollis, 246 
sitchensis, 136, 139 
skewness of thorax, 12 
skimmers, 161, 219 
smithii, 234 
smoky winged Argia, 295 
snake feeders, 4 
solita, 297, 299 
Somatochlora, 183 
albicincta, 189 
cingulata, 190 
elongata, 192, 193 
ensigera, 186, 187 
filosa, 188, 189 
forcipata, 192 
franklini, 189, 195 
georgiana, 186 
hudsonica, 190 
incurvata, 194, 195 
kennedyi, 196 
linearis, 186, 189 
minor, 191 
provocans, 188, 189 
sahlbergi, 195 
semicircularis, 193 
septentrionalis, 196, 197 
tenebrosa, 187, 188 
walshi, 191, 192 
whitehousi, 195, 196 
williamson, 193, 194 
sordidus, 104 
specularis, 121, 122 
spicatus, 108 
spiders, 24 
spiniceps, 100, 101 
spiniferus, 129 
spinigera, 180, 181 
spinosa, 181 
spinosus, 118 
spiracle, 13, 69 
spoliatus 117. 118 
sprawlers, 31 
Springer, Frank, 45 
stealth, 9 
stella, 181 
stigma, 16 
stigmata, 63, 64 
stomach, 33 
storms, 24 
stultus, 278, 279 
stylurus, 98 
subapicalis, 173, 114 
subarctica, 147, 148 
subcosta, 15 
subfasciata, 215 
submedianus, 113 
subnodus, 15, 16 
subornata, 230 
subquadrangle, 18 
subtriangle, 58 
INDEX 
suleatum, 328, 329 
superbus, 213 
supratriangle, 58 
Sympetrum, 117, 202, 231 
ambiguum, 235 
assimilatum, 236, 237 
atripes, 240 
corruptum, 232, 233 
costiferum, 239, 240 
danae, 239, 240 
furcatum, 234, 235 
illotum, 233 
madidum, 234, 235 
obtrusum, 236 
pallipes, 235, 236 
rubicundulum, 231, 236 
semicinctum, 237, 238 
vicinum, 238 
synthorax, 12 
syriaca, 261 
Tachopteryx, 54 
thoreyi, 55 
taeniolata, 167 
Tanypteryx, 54 
hageni, 54. 55 
tarsus, 14 
Telagrion, 309, 334 
Teleallagma, 309 
daeckil, 310 
Telebasis, 305 
salva, 304, 305 
tenebrosa, 187, 188 
tenera, 206 
teneral, 10 
Ten spot, 224 
tenuicincta, 206 
ternaria, 224, 226 
Tetragoneuria, 178 
canis, 180, 181 
cynosura, 178, 180 
spinigera, 180, 181 
spinosa, 181 
stella, 181 
thoracic carina, 12 
Thoreau, H. D., 22 
thoreyi, 55 
tibia, 14 
tibialis, 297, 299 
Tillyard, R. J., 359 
time keeper, 146 
titia, 265 
tonto, 299, 300 
trachea, 17 
tracheal gills, 33 
Tramea, 25, 253 
abdominalis, 253 255 
carolina, 253, 255 
lacerata, 263, 254 
onusta, 26, 253, 254 
virginia, 254 
377 
