No. 39] ODONATA OF CONNECTICUT: AESHNIDAE l8l 



2. Mentiim more than half as broad at base as at apex; ovipositor of 



female not usually reaching the posterior margin of segment 9 



and never extending beyond it 3 



Mentum of labium not, or scarcely more than, half as broad at 

 base as at apex 7 



3. Lateral spines present on abdominal segments S to 9 eremita 



Lateral spines present on abdominal segments 6 to 9 4 



4. Femora dark with three pale annuli ; abdomen marked with irreg- 



ular pale blotches on a darker ground color interrupta 



Femora uniform in color ; abdomen without irregular blotches, 

 longitudinally striped 5 



5. Lateral lobes of labium (labial palpi) truncate; lateral spines on 



abdominal segment 6 rudimentary, distant from the caudal margin 



of the segment by at least four times their own length juncea 



Lateral lobes of labium not truncate, but curving to a prominent 

 hook; lateral spines on segment 6 of the abdomen well developed, 

 distant from the caudal margin by about their own length 6 



6. Lateral margins of the mentum of labium not arcuate at base; 



dark median band of the abdomen not deepened about the dorsal 



punctae clepsydra 



Lateral margins of the mentum of labium feebly arcuate at base; 

 dark median band of the abdomen deepened about the dorsal 

 punctae canadensis 



7. Lateral lobes of labium tapering to a slender, slightly hooked point ; 



legs uniformly colored; genitalia of female reaching caudad 



nearly or quite to the margin of segment 10 constricta 



Lateral lobes of labium squarely truncate ; femora and generally 

 the tibiae also with alternate pale and dark annuli ; genitalia of 

 female never reaching caudad to the middle of segment 10 umbrosa 



Adults, Males 



1. Anal triangle 2-celled; spines of anterior lamina directed ventrad 2 

 Anal triangle 3-celled; spines of anterior lamina curved dorsad.. 8 



2. Hamular processes long and slender, separated from the hamular 



folds which are reduced ; spines of anterior lamina long, tapering 



to a fine point juncea 



Hamular processes short, continuous with the hamular folds, which 

 are well developed; spines of anterior lamina short and straight 3 



3. Superior appendages with a prominent inferior basal tubercle ; 



abdominal segment 10 entirely black tuberculifera 



Superior appendages without a prominent inferior basal tubercle ; 

 abdominal segment 10 with 2 dorsal spots sometimes united .... 4 



4. Lateral thoracic stripes either narrow and nearly straight or divided 



into two spots interrupta 



Lateral thoracic stripes broad and never divided into two spots . . 5 



5. Superior appendages each with a low inferior prominence at base, 



their apices rounded usually without a terminal spine, and their 



superior carina strongly elevated apically eremita 



Superior appendages each without a low inferior prominence at 

 base, their apices acute with a terminal spine and their superior 

 carina elevated moderately apically 6 



6. Fronto-clypeal suture with a black line ; pale spots between the 



pale thoracic stripes very large clepsydra 



Fronto-clypeal suture without a black line ; pale spots between the 

 pale thoracic stripes small 7 



7. Cephalic margin of the first lateral stripe almost rectangularly 



sinuate ; superior carina of the superior appendages denticulate 



canadensis 



