474 



(Fig. 112) with broad lateral valves, which are serrate on the ventral 

 margin and extend to the apex of segment ten ; prostyles slender, 

 rod-like and bent ventrad at the apex (Fig. 41). 



Meastirements 



Length, S 44 mm. 



Length, 9 42 mm. 



Length of abdomen, S 36 mm. 



Length of abdomen, 2 32 mm. 



Length of hind wings, S 28 mm. 



Length of hind wings, 9 29 mm. 



Width of hind wings, $ 6 mm. 



AVidth of hind wings, 9 6 mm. 



This species is common along the drainage ditch north of Urbana. 

 Nymphs collected May 2y and 29, 191 5, emerged June 19. The species 

 flies until late in October and specimens have been taken as late as 

 October 22. It is apparently limited to the northern half of the state, 

 though probably occurring wherever conditions are favorable. 



Specimens have been seen from Galena, Havana, Muncie, Oregon, 

 Peoria, Savanna, Urbana, and McHenry County. 



HetaERINA TITia (Drury) 



Nymph. — Unknown. 



Adult; Male. — Color, very dark green and brown. 



Head dark brown, faintly metallic; labium with subtriangular 

 median lobe, the palpi with broad black proximal segments, and black 

 distal segments about as long as the fixed hook of the pro.ximal seg- 

 ment; antennae brown; clypeus and labrum shining; front with a 

 broad transverse buff stripe immediately above the clypeus, the front, 

 vertex, clypeus, and labrum pilose, the setae brown. 



Thorax black and brown, slightly bronzed ; pronotum with the 

 caudal lobe somewhat pointed, convex, and projecting caudo-dorsad ; 

 proepimera distinct ; interpleural suture distinct ceplialad of the 

 spiracle; mesinfracpistcrnum buff, with a dorsal dark stripe; cephalic 

 shoulder of the mesepimcron light brown, the mesepisternum with a 

 greenish longitudinal stripe extending from the caudal margin nearly 

 to the spiracle; metepimcron with a median black stripe; intersternum 

 with two faint black spots near the cephalic margin; legs uniform 

 dark brown, the tibiae lighter in color than the femora, the setae of 

 the front femora in eleven or fourteen rrnvs, tarsi and claws black; 



