58 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



2. Dorsum of the second abdominal segment with black spot occupy- 



ing at most half the segment, usually less 3 



Dorsum of the second abdominal segment with black spot occupy- 

 ing more than half the length of the segment, usually as long 

 as the segment 13 



3. Caudal half of the seventh abdominal tergum blue aspersum 



Caudal half of the seventh abdominal tergum black 4 



4. Dorsum of the fourth and fifth abdominal terga more than half 



black 5 



Dorsum of the fourth and fifth abdominal terga less than half 

 black 7 



5. M2 of the hind wing arising between the third and fourth post- 



nodal cross-vein 6 



Ms of tlie hind wing arising beyond the fourth postnodal cross- 

 vein carunculatum 



6. Superior anal appendages with a large rounded ventral lobe (Fig. 



10, No. 10) minusculum 



Superior anal appendages without a rounded ventral lobe ; similar 

 to hageni but the tips upturned recurvatum 



7. Superior anal appendages bifurcate, their arms separated by an 



obtusely rounded notch 8 



Superior anal appendages not bifurcate, sometimes notched, the 

 notch acute 9 



8. Tergum 8 blue with black stripe on each side laterale 



Tergum 8 entirely blue ebrium 



9. Inferior anal appendages longer than the superiors 10 



Inferior anal appendages shorter than the superiors 12 



10. M2 usually arising between the third and fourth postnodal cross- 



vein in the hind wings; anal appendages as in Fig. 10, No. 11 hageni 

 M2 arising between the fourth and fifth postnodal cross-vein in the 

 hind wings 1 1 



11. Superior anal appendages blunt; lateral profile as shown in Fig. 10, 



No. 23 calverti 



Superior anal appendages acute; lateral profile as shown in Fig. 10, 

 No. 15 cyathigerum 



12. Superior anal appendages with the apical tubercle or lobe project- 



ing noticeably beyond the dor so-caudal angles when viewed from 



the side (Fig. 10, Nos. 25, 28) doubledayi 



Superior anal appendages with the apical tubercles not projecting 

 noticeably beyond the dor so-caudal angles when viewed from tlie 

 side ( Fig. 10, Nos. i, 5, 29) civile 



13. Second antennal segment pale except the distal third, which is fre- 



quently dark brown 14 



Second antennal segment entirely dark brown or black 16 



14. Dark stripe of the mesopleural suture paler in color than the dorsal 



stripe covering the carina, or reduced to a line ; anal appendages 



as in Fig. 10, No. 14 vesperum 



Dark stripe of the mesopleural suture not paler in color than the 

 dorsal stripe covering the carina 15 



15. Superior anal appendages without a ventral tooth (Fig. 10, No. 



26) ; dorsum of abdominal segment 9 black pictum 



Superior anal appendages with a ventral tooth (Fig. 10, No. 22) ; 

 dorsum of abdominal segment 9 pale signatum 



16. Front with blue color extending to the median ocellus; postocular 



spots large, each forming an equilateral triangle in shape ; black 

 stripe of the mesopleural suture narrow, indistinct or wanting 



traviatum 

 Front with blue or pale color not extending dorsad to the median 



