NO. 1710. NORTH AMERICAN DRAGONFLIES— WILLIAMSON. 



385 



segment; 9 usually shows the vestige of a basal spot on either side of 

 the middorsal line; beneath 8 is always spotted basally on either side, 

 9 usually, and 7 obscurely, if at all. 



Wings hyaline to strongly tinged with yellowish, usually slightly 

 tinged; rarely a minute basal brown spot in the costal space; stigma 

 black. (See fig. 7.) 



Ai)pendages similar to illinoiensis but slightly straighter and longer 

 (2.5 mm. in illinoiensis; 3 mm. in iKicijica) ; median external tooth 

 small but always present; superiors and inferior about equal in 

 length; the superiors with an external basal yellow spot, variable in 

 size. 



Female. — Similar to male ; yellow ring on 2 always interrupted dor- 

 sally; other spots as in the male bounded i)osteriorly by the trans- 

 verse carina, excepting on 7 and 8, and sometimes 6, when they are 

 I)roduced slightly posteriorly; the ventral spots on the posterior seg- 



FiG. 7.— Wings of male Maceomia pacifica, Bluffton, Indiana, August 19, 1906. 



ments are plainly present only on 8 and sometimes not there; dorsal 

 and inferior lateral spots on 3, 7, and 8 separated. 



Wings hyaline to deeply yellowish tinged, the color most pro- 

 nounced distal to the triangles; basal costal spots small, not reaching 

 the first antenodal in any case. The wings of 7 females show the 

 following: Triangle of front wing, free 7, crossed 7; subtriangle of 

 front wing, free 1, crossed 13; triangle of liind wing, free 7, crossed 7. 

 Vulvar lamina not exceeding the eighth segment, developed only as 

 a short, troughlike fold at the apex of the sternum. Abdominal 

 appendages similar to illinoiensis. 



I have been able to positively identify this species through the 

 kindness of Mr. Henshaw, who loaned me Hagen's type as well as 

 the types of annulata. The type of pacijica is a collection of frag- 

 ments (about 20 in number) as stated by Hagen. These are carefully 

 arranged and glued on a piece of cardboard and are sufficient to 

 identify the species. 



Proc.N.M.vol.37— 09 25 



