540 



Described from a number of specimens in the collection of E. B. 

 Williamson. 



This species has not been reported from Illinois. It has been 

 collected in Ohio and was originally described from Florida. It is 

 possible that it may occur occasionally in southern Illinois. 



Enallagma ebrium (Hagen) 



Nymph. — Not available for study. 



Adult; Male. — Color, blue and black. 



Head black and blue; mouth-parts pale, the labium with a sub- 

 triangular median lobe; labial palpi buff, the distal segment dark at 

 the apex; antennae black except the tips of the first and second seg- 

 ments; postclypeus black; anteclypeus, labrum, exposed portions of 

 the mandibles, their trochantins, genae, and a transverse stripe above 

 the clypeus, pale ; remainder of the front and vertex black ; postocular 

 spots large, subcuneiform, the margins irregular; occiput and post- 

 genae pale except a transverse black stripe caudo-ventrad of the post- 

 ocular spots. 



Thorax blue and black ; pronotum black, the cephalic lobe with a 

 pale transverse stripe, median lobes with pale spots on the lateral and 

 caudal margins of the caudal lobe; dorsal border of the proepimera 

 black, the ventral two-thirds pale; mesostigmal plates elongate, the 

 lateral angles covered with a pale spot and slightly elevated, though 

 not as much as in carunculatinn or civile; dorsal mesothoracic stripe 

 occupying about one-third of each supraepisternum, the lateral margiiis 

 parallel ; pale stripe of the supraepisterna extending from the cephalic 

 margin to near the paraptera, widest above the infraepisternum; black 

 stripe of the mesopleural suture widest just caudad of the infraepi- 

 sternum, and extending across and occupying about one-half of that 

 sclerite ; caudal margin of the metepisterna black and a black spot on 

 the metapleural sutures cephalad of the wing bases ; remainder of the 

 pleura blue, the postcoxal areas buff; paraptera black, trapezoidal, 

 the cephalic margins and a spot just below the lateral angles pale; 

 legs striped, black and buff, the femora and coxae pale, the entire 

 dorsum of the femora black except a small spot near the base, fre- 

 quently appearing as an emargination of the black dorsal stripe ; tibiae 

 with a black stripe from base to near the apex, occupying half or less 

 of the dorsal aspect and often including the cephalo-ventral row of 

 setae ; tarsi and claws pale, dark at the tips ; wings with nine to ten 

 postnodal cross-veins in the front wing; vein Mo arising between the 



