200 ENTOMOLOGICAL NEWS. [May, ' 1 2 



Females from various localities show the following sizes : 



It is possible that a more intelligent study of larger material 

 may reveal that I have included more than one species in the 

 above discussion, but for the present I am forced to conclude 

 that putrida is a synonym of moesty. In all the material I 

 have been unable to detect any differences in male abdominal 

 appendages or female mesostigmal laminae. 



Argia intruda n. sp. 



Associated with the dark moesta at Wister, Oklahoma, are 

 other Argias which seem to be specifically distinct from moesta, 

 and which, after some correspondence with Dr. Calvert on the 

 subject, I venture to describe as new. 



Male. Abdomen 33-36, average 34.5, hind wing 25-26, average 25.3. 



Female. Abdomen 33-37, average 33.8, hind wing 26-29, average 27.2. 



Male. Head dull pale brown, rear of head black above, pale brown 

 below. 



Thorax pale brown, black as follows : A middorsal thoracic stripe, 

 on either side occupying one-half the mesepisternum ; a spot on the 

 mesepimeron against the humeral suture where it meets the mesinfra- 

 episternum, and another above against the first lateral suture just in 

 front of (or below) the posterior border; a faint line on humeral 

 suture, widened into a small spot above. This is the palest coloration 

 represented and is shown by four specimens ; in others the two spots 

 on the mesepimeron grow towards each other till they form an oblique 



