204 DRAGONFLIES OF NORTH AMERICA 
7 Length not more than 18mm............. Leucorrhinia, p. 241 
Length more'than 18 mn!) 0 ae Dythemis, p. 248 
8 Abdomen, smooth?!) 2! 0 4 et yw eis Waeeramte ny FEE Ok 9. 
Abdomenhainy 22) sy ay ce ON a ean cena 10 12 
9 . Lateralspines” very sliort. 0.0.2 oe Paltothemis, p. 250 
Lateral’spines' long’. 7.2" 22 EY SU Oe I) a wade eae 10. 
10° “Spines ofS ehort; of 9 long. ea! oie Pachydiplax, p. 244 
Spines of 8 and 9 both long and similar.................... Lt: 
11 Teeth on inner edge of lateral lobe of labium deeply cut........ 
Bhs Si sateen etna eam Maite MERLOT RAPD ERTL. 0 os Pantala, p. 251 
Teeth Obsolete...) Cou le sae els ee ee Tramea, p. 253 
127 SR ROPAM SE CRENG wets fu ot gos ae a eaten Nannothemis, p. 204 
Rateral setae S210) eee es Erythrodiplax, p. 214 
Lateral setae more than 10................. Sympetrum, p. 231 
ta: RAGETaMBeLBC OCs. cao eet ee ieee Ladona, p. 217 
Lateral setae ios 10 oe). ee ae 14 
14 Median lobe of labium evenly contoured...... Libellula, p. 219 
Median lobe of labium crenulate on front border............ 15. 
fey VEALCPAL Be RAeae. o . e eet Lea eee green AEE Orthemis, p. 216 
PARDCERLBELAG LON Sf. os Grice Mate Le ee hae Plathemis, p. 229 
36. NANNOTHEMIS Brauer 
These are the smallest of our dragonflies; dumpy little fellows about 
an inch long; clear-winged, and with a shape of triangle and of anal 
loop that at once distinguishes them from everything else in our fauna. 
There is a single species of local occurrence in the eastern United States. 
The nymph (Ndm. ’01%, p. 254) is short, thick set, hairy on legs and 
rear blunt abdomen. It is an inhabitant of little stagnant pools in 
marshy places. 
Dr. Calvert writes us that he has reared three nymphs from egg 
to imago; two of them in 23 months with 11 and 12 larval instars 
respectively, the third in 34 months and 19 days with 11 larval in- 
stars. 
171. Nannothemis bella Uhler 
The Blue Bell 
Uhler 57, p. 87: Mtk. Cat. p. 147: Howe ’20, p. 75: Ris. ’11, p. 388: Garm. ’27, 
p. 260. 
Length 19 mm. Expanse 32 mm. Me. and Ga. to Ind. and Ont. 
