1900] 



ENTOMOLOGICAL NEWS. 



455 



iliscernible, and the description of E. calvcrti female, as given 

 below, will serve as well for the female of anncxum. The 

 amount of black on abdominal segment 10 of the males varies 



considerably in both species. 



Left superior abdominal appendage of (a) 

 E. annexuni cf , Sheep Creek, Aug. 6, 1899, 

 and (3) E. calverti cf, same place and dale. 

 Both are interiio-latero-dorsal views. 



The extent of black on the 

 abdominal appendages seems 

 to depend on age. Teneral 

 individuals of annexuni have 

 the appendages entirely pale, 

 excepting the tip of the lower 

 branch of the superiors and 

 the tip of the inferiors. Older 

 individuals have the append- 

 ages entirely black, excepting 

 the base and lower part of the 

 inferiors. In profile the out- 

 line of the superiors is often 



suggestive of E. geminatum Kellicott or E. divagans Selys. 



Annexiim was the most abundant Enallagnia observed. 



5. Enallagma calverti Morse. (PI. IX, figs. 5, 9, 10). 



Ab. (^ 23-26, 9 24-26 ; h. w. cf 19-21, 9 20. 



Medicine Bow, July 20 ; Sheep Creek, Albany Co., July 23 

 and August 6. Several pairs were taken and in every case the 

 female was greenish in color. Bright blue males were taken 

 singly. They are older and possibly spent individuals. This 

 applies as well to annexuni. 



9 . — Greenish or bright blue ; head and thorax marked with black, as 

 in the male ; posterior border of prothorax rounded, entire. First ab- 

 dominal segment black at base ; dorsum of 2-10 black, pale as follows : 

 basal rings on 3-7, interrupted on 3 by the narrowed dorsal stripe, 8 en- 

 tirely pale, excepting a median cordate spot, point anterior, or this spot 

 may extend backward to the apex and on to the sides of the segment, 

 the point being produced anteriorly to the base ; the black dorsal stripe 

 narrows gradually on 9 and 10 to the apex of 10. 



6. Enallagma civile Hagen. 



Sheep Creek, Albany Co., July 23, 2 $ $ . 



7. Enallagma anna n. sp. (PI. IX, figs, i, 2). 



Ab. (^ 26, $ 25 ; h. w. c^ 20, $ 21. 



(^ Head yellowish below ; above blue ; vertex and frons above black ; 

 first joint of antennae blue ; postocular spots connected ; rear of head 



