1910] Muttkowski, Records of Dragonflies. 171 



Table of the species of Ischnura Charpentier. 



The following includes all North American species, but refers 

 only to the males : 



1. Antehumeral green stripe present (a superior spot and in- 



ferior stripe in posita) 2 



Antehumeral green stripe indicated by superior and inferior 



spots 12 



No trace of green antehumeral stripe denticollis 



2. Abd. segment 9 black on dorsum 3 



Abd. segment 9 with blue on dorsum 4 



:;. Abd. segment 8 blue, antehumeral stripe complete ramburi 



Abd. segment 8 bronze black, antehumeral stripe like an in- 

 verted posita 



4. Abd. segment 9 entirely bine (occasionally in verticalis) .... 5 

 Abd. segment 9 with lateral black stripes or spots. . . . 9 



5. Abd. segment 10 with a dorsal bifid process 6 



Abd. segment 10 with cylindrical, entire process 8 



6. Abd. segment 8 entirely blue 7 



Abd. segment 8 with lateral black markings demorsa 



7. Superior appendages decurved, one-half the length of 10, with 



an acute, curved apical process ; inferiors nearly the length 



of 10, with an outer, acute process barberi 



Superior appendage apparently consisting (in lateral view) of 

 a small rounded lobe one-fourth the length of 10, in rear 

 view a short acute process extending obliquely downward 

 and inward ; inferiors one-half the length of 10, an outer 

 acute process with the tip deflected inwardly. . . -utahensis n. sp. 



8. Abdomen brassy green, markings pale green prognatha 



Abdomen bronze black, markings bine kelHcotti 



9. Abd. segment 8 with lateral black markings 10 



Abd. segment 8 entirely blue credula 



10. Process of inferior appendage not bifid at apex 11 



Process of inferior appendage bifid or trifid at apex perparva 



11. Inferior appendage much longer than superior, cylindrical, 



notched at tip ; superior appendage with slender, straight 



prolongation erratica 



Inferior appendage hardly longer than superior, a rectangu- 

 lar superior basal lobe ; not notched at the apex ; superior 

 appendage with decurved prolongation verticalis 



/. prognatha should fall under 6 with demorsa. Until recently this 

 species was known to me onlv through a broken male, and I accepted 

 Hagen's description of the process on 10 as "cylindrical" for this table. 

 However, from several specimens sent me by Mr. Williamson, I find that 

 the process is bifid, though narrowly so, in its apical sixth. 



