34 Bulletin Wisconsin Natural History Society. [Vol. 9, Nos. 1-2. 



All legs yellow beneath, green at the sides with black as follow- : 

 femora above with a broad stripe, tibiae with a latero-external narrow 

 stripe, tarsal joints ringed and tips of claws; all spines of the legs. 



Abdomen dark metallic green and pale yellow, segments 8-9 pale 

 bine. Base of 1 with a quadrangular black spot; sides subapically 

 with a small elongated spot, and the suture laterally with a fine 

 black line to the sternum. A diamond-shaped spot occupies the apical 

 half of 2 ; at its lateral points a long lateral stripe extends toward the 

 base of the segment, but does not reach the suture ; (this stripe is 

 broad and connected with the dorsal spot on the right side of the 

 paratype, slender and broken on the left side ; disconnected in the 

 holotype). 3-5 with apical half black, truncated, briefly tridentate 

 toward the base, dorsally and laterally. A very narrow basal ring of 

 pale green, interrupted dorsally on 6 and 7. 8-9 pale blue. Dorsum of 

 10, superior appendages and apices of inferior appendages black. 



Superior appendages hardly one-fourth as long as 10, conical when 

 viewed laterally. Inferior appendages longer, half as high as 10, at 

 the upper end a short apical, rounded lobe. 



Wings hyaline, stigma buff-colored. Vein M 2 , arising at the fifth 

 postnodal in the fore wings, at the third in both hind wings of the 

 holotype. In the paratype the venation of the hind wing is normal. 



Female unknown. 



Abdomen male 23-24 mm., hind wing 15-16.5 mm. 



Described from male holotype (cat. no. 27699) and one broken 

 male paratype (cat. no. 27696), both in the collection of the 

 Milwaukee Public Museum. Collected May 27, 1908, in a swampy 

 depression in Johnson's Woods, Milwaukee, Wis.* 



Ordinarily T should have placed this species with Ccenagfion; 

 because of its close adherence to the description of C. resolutum 

 Hagen I suspected an identity with that species until an examina- 

 tion of the appendages of several specimens of resolutum sent me 

 by Mr. Williamson proved its distinctness. Because of the anal- 

 ogies of color pattern and form of appendages this species is placed 

 in Bnallagma, although the female is not known at present. 



The species will fall close to Bnallagma carunculatum and 

 durum, but the coloration and form of appendages will easily 

 distinguish it. 



* Also 29 males collected May 26, 1911, in the same locality. Since the 

 female lacks the sternal spine, this species must lie placed in Cwnagrion.— 

 May 29, 1911. 



