NORrH AMERICAN ODONATA. 265 



%. Wings brownish yellow, sometimes a dark reddish brown spot near the 

 onter angle of the triangle, sometimes a short, basal, brown streak on hind wings. 

 Pterostigma reddish brown. 



9 . Front wings with a patch near the outer angle of the triangle and a ragged 

 nodal band, brown. Hind wings similar, the patch larger, prolonged at its hind 

 end and turned inwards towards the anal angle. Front and hind wings with 

 brown markings bordered with yellow, sometimes a brown basal streak in the 

 subcostal space. Pterostigma yellowish brown. 



Abd. I 13-15, 911-14.5. H. w. % 16-19, 9 14.5-19.5. 



Common around Phila., June 17 — Aug. 31, 



United States east of the Mississippi River; Texas, Argentine 

 Republic, West Indies. 



N. B. — Kirby (Cat Odon, p. 10) holds that teneni Say is the proper name of 

 this species found in the U, S., and that domitin Drury is distinct. It is here 

 preferred to follow Dr. Hagen, who regards tenera and many other names as 

 synonyms of a very variable species— ^?o»»i(ia. Thus females from Florida have 

 the hind margin of all the wings narrowly edged with brown from the nodal 

 band to the apex, and the nodal band and the patch on the triangle sometimes 

 confluent. 



38. Mesotliemis Hagen. 



Hagen, Syn. Neur. N. A., p. 170, 1861, Kirby, Trans. Zool. Soc. Lond. xii, p. 

 303. 1889. 



65. Mesotheinis siinplicicollis .Say. 



LiheUula s. Say, Jour. Ac. Phila. viii, p. 28, 1839. M. s. Hagen, /. c. p. 170, 1861, 



Bright green ; thorax frequently with mid-dorsal carina, antehumeral, hu- 

 meral and two indistinct lateral line.s, and some marks near the coxse, black ; 

 1-3 mostly green, 4-10 with a I'lid-dorsal black band on apical half, or 8-10 en- 

 tirely black. 



%, . Sup. app. yellow. Thorax and abdomen entirely blue pruinoae in old males. 



9 . Vulvar lamina erect, triangular, entire. 



Abd. % 26-33, 9 28-29.5. H. w. % 27-35, 9 31-33. 



Common around Phila., June 10 — Aug. 8; ovipositing June 17, 

 22, July 26. 



United States east of the Rocky Mts., Mexico, West Indies, Ba- 

 hamas (Fox and Johnson, Moore and Bullock). 



39. Pachydiplax Brauer. 



Brauer, Verb, z.-bot. Gesell. Wien, pp. 368, 722, 1868. Kirby, Trans. Zool. Soc. 

 Lond. xii, p. 305, 1889. 



66. Pachydiplax loiigipeiiuis Burmeister. 



LibelMa I. Bnrm., Haudb. Eut. ii, p. 850, 1839. Mesothemis I. Hagen, Syn. 

 Neur. N. A., p. 173, 1861. 



TKANS. AM. ENT. SOC. XX. (34) SEPTEMBER, 1893. 



