561 



ventral stripe including the cephalo-ventral row of setae ; tibiae with 

 long dorsal stripes extending from a point slightly distad of the femora 

 to near the apices of the segments; tarsi and claws pale except at 

 the apices ; wings short, the postnodal cross-veins ten in the front 

 wing, nine in the hind wing; M 2 arising between the fourth and fifth 

 postnodal cross-veins in the front wing and between three and four 

 in the hind wing. 



Abdomen metallic green and pale blue; terga 1-7, inclusive, 

 metallic green above, with broad, lateral, pale stripes on one and two, 

 and narrow lateral stripes and interrupted basal rings on 3-7; eighth 

 tergum green on the dorsum except at the apex, where there is a tri- 

 angle of blue, the lateral angles of which are continuous with the 

 broad blue, stripes on the lateral surfaces ; ninth and tenth terga blue 

 with green basal triangles on each side of the meson ; anal appendages 

 (Figs. 1 59, 1 60) with the superiors small and tuberculate, the inferiors 

 much larger than the superiors and toothed at the apices. 



Female. — Color, metallic green or bronze, and yellow. 



Head similar to that of the male except that within the dark 

 area of the front there is a pale spot ventrad of each antennal fossa. 



Thorax differing from that of the male in having the caudal 

 lobe of the pronotum emarginate on each side of the meson, the 

 piece being trilobed ; the mesostigmal plates (Fig. 182) have the mesal 

 margins strongly elevated and projecting dorsad ; the front wings have 

 nine to ten postnodal cross-veins, the hind wings usually nine. 



Abdomen with terga 1-8, inclusive, greenish bronze, the lateral 

 margins pale ; ninth tergum green above, with an apical blue triangle 

 and blue lateral stripes; tergum ten blue, with two small green tri- 

 angles at the base; anal appendages of the usual type; ovipositor, in- 

 cluding prostyles, extending beyond the apices of the anal appendages, 

 the prostyles dark. 



Measurements 



Length, $ 27 mm. 



Length, 9 26 mm. 



Length of abdomen, $ 21.5 mm. 



Length of abdomen, 9 21 mm. 



Length of hind wings, S 15 mm. 



Length of hind wings, 9 15 mm. 



Width of hind wings, 2 4 mm. 



Width of hind wings, 9 4 mm. 



The species is apparently limited to the northern third of the 

 state. It was abundant at Lake Villa, July 13, 1915, and was also 

 taken at Freeport July 8, 191 5. 



