172 Bulletin Wisconsin Natural History Society. [Vol. 8, No. 4. 



12. Bifid process on 10 as high as 10, forked in apical half cervula 



Bifid process on 10 one-fourth as high as 10, forked in less 

 than apical half damula 



Ischnura utahensis n. sp. 



Male — Black, without metallic lustre, orange and blue. 



Labium and labrum yellow, rhinarium pale green, nasus dark 

 metallic green, frons orange, vertex black, ocelli brown, occipital spots 

 large and green, the narrow stripe between them interrupted at one- 

 third. Eyes green (type), head yellow in rear. 



Prothorax with anterior lobe black above, margined with green. 

 Median lobe green. Posterior lobe black, margined with green ; at the 

 anterior edge a narrow black line is given off at the lateral fourth 

 which crosses the median lobe and extends slightly beyond the base 

 of the anterior lobe. Posterior margin regularly convex, the black at 

 the side being obtusely excavated. 



Thorax with a broad black dorsal stripe, a green antehumeral 

 stripe one-half as wide, a black humeral of equal width, which is 

 narrowed above and below. Sides green, a very fine black line at the 

 upper third of the second suture (one specimen with a similar one the 

 first suture). Paler green beneath. Legs yellow, femora and tibiae 

 with a black external line, the line strongest on the anterior tibise, 

 barely indicated on the posterior ones ; tarsal joints ringed with black, 

 apical half of claws black; all spines of the legs black. 



Abdomen : segment one green, two small median twin spots on 

 dorsum ; two black above, the stripe wide at the base, narrowing 

 gradually to apical fourth, then widening broadly to the apex, where 

 the black extends half way down the sides, which are green ; segment 

 three to six black on dorsum, the stripe narrow, except on the apical 

 fourth where it is broad and cup-shaped, narrowing to a point basally 

 and at the apical fourth, but interrupted only at the base ; segment 

 seven with the black stripe extending half .way down the sides ; sides 

 of three to seven orange, except the base of three, which is green ; 

 segment eight and nine entirely blue ; ten black above, blue on the 

 sides below. 



Forked elevation on segment ten hardly half as high as ten, rising 

 gradually from the base, forked in less than apical half, forming a 

 right angle, the branches acute at the apex. Superior appendages 

 hardly one-fourth as long as ten, in lateral view showing as a small 



