482 



It appears on the wing late in summer and may be taken during 

 August and September. 



Described from a large series of specimens in the collection of 

 E. B. Williamson. Probably occurs in Illinois. 



Lestes disjunctus Selys 



Nymph. — Not available for study. 



Adult; Male. — Color, blackish brown and yellow. 



Head blackish brown above, pale yellow below; median lobe of 

 the labium pale, subquadrangular, the median cleft shallow, but with 

 the usual dark line extending to the base of the piece ; antennae black, 

 the two proximal segments very short, much shorter than the two distal 

 ones, the apex of segment two slightly paler; postclypeus almost black, 

 the anteclypeus, labrum, trochantins of the mandibles, and genae, yel- 

 lowish green ; occipital and postgenal regions black, becoming pollinose 

 with age ; eyes brownish. 



Thorax : prothorax black, largely pollinose in older individuals ; 

 proepimera and proepisterna distinct; caudal lobe of the pronotum 

 black, cephalic lobe black, median lobes black, the furrow separating 

 them indistinct ; mesostigmal plates black ; mesinf raepisterna black or 

 largely black, the supraepisterna blackish brown with the exception 

 of a narrow yellow stripe on the ventro-lateral margins ; mesepimera 

 dark brown with the exception of the cephalo-ventral shoulders, which 

 are vellow ; metepisterna largely yellow, becoming more or less black 

 with age from the spreading of the black stripe on the metapleural 

 suture ; stripes of the metapleural sutures covering about two-thirds of 

 the metepimeron, the remainder of that sclerite yellow; postcoxal areas 

 buff, without black markings ; legs slender, pale, the coxae black and 

 pale yellow ; femora striped, the hind femora with three black stripes, 

 the middle and front femora with two each ; tibiae with a single dark 

 stripe which diffuses over the segment on the distal third ; rows of setae 

 of the front femora composed of two and nine setae respectively; 

 wings clear, the antenodal cross-veins two, postnodals about eleven, 

 and M2 arising between the second and third postnodal cross-veins in 

 both wings ; stigma dark brown, surmounting two cells. 



Abdomen brown to black, and yellow; first tergum black with the 

 exception of a very narrow apical ring; dorsum of the second tergum 

 dark brown, the lateral margins marked by a narrow longitudinal yel- 

 low stripe, the dorsum of 3-6 dark brown, the stripe widened sub- 

 apically ; segment seven black, with a pale lateral stripe ; segments 

 eight, nine, and ten black; anal appendages (Fig. 133) blackish brown, 



