1911] Mvttkowski, Wisconsin Dragonflies. :3 



•Enallagma geminatum Kellicott. (Plate IV, figs. 3, 4 and 5.) 



North Hudson, St. Croix Co., July 6-12, one male. 



Enallagma divagans Muttk., Bull. Wis. N. H. Soe., (2) 8, p. 55, 

 1910; female from St. Croix Dam, Doug-las Co., July 17-22, 1910. 



This species establishes a new record for the state. At first 

 glance I took the male for E. piscinarium Williamson, until a 

 subsequent more careful examination of the markings and form 

 of the appendages proved it to be geminatum. The apical seg- 

 ment and the appendages are malformed, with the result that we 

 have two differing forms of appendages, as figured on the accom- 

 panying plate. The -coloration on the whole agrees very well with 

 Kellicott's description, except that the lateral thoracic markings 

 are intermediate between those given for geminatum and William- 

 son's piscinarium. 

 Enallagma walkeri n. sp. (Plate IV, figs. 1 and 2.) 



Male. — Black and dull metallic green ; pale markings of delicate 

 pale green and blue. 



Face pale green, labrum bluish, a narrow black line and median 

 spot at its upper end ; rhinarium and frons yellow, nasus dull metal- 

 lic green. Vertex black, with obscure coppery lustre, yellow of frons 

 extending farther back in a point at the eyes. Back of eyes yellow, 

 but middle third of head surrounding the foramen black. Occiput 

 with large pale spots, the posterior edge of which bear two or three 

 denticulations. 



Hind margin of prothorax generally rounded, produced medially 

 in a small obtuse point, which is slightly depressed ; in oblique view 

 the lobe, therefore, seems indistinctly bilobed. Bear margin with a 

 yellow stripe on each side narrowing toward the dorsum ; the stripes 

 are separated by the middle fifth of black. Prothorax otherwise black ; 

 the paratype with two small dorso-lateral spots of blue. 



Thorax black, with a faint bronze lustre ; antehumeral stripes and 

 sides pale green. Antehumeral narrowed at the upper third (broken 

 into an inverted !-spot in the paratype on the left side), the black 

 fine line from base of fore wing to base of hind wings ; at its anterior 

 humeral correspondingly widened at the same point. Sides with a 

 end a brief line 1 mm. in length, and somewhat lower at the middle 

 of the first suture a small round spot. A simdar, heavier line widened 

 below on the second suture. Wing sutures pale green. 



