536 



Head and thorax similar to those of the male except that they 

 are somewhat lighter in color ; mesostigmal plates as shown in Figure 

 213. 



Abdomen with broad longitudinal stripes on the second tergum 

 which are much expanded near the caudal margin ; terga 3-7 with 

 narrow longitudinal stripes, all of which are expanded near the caudal 

 margin, the longitudinal stripe of eight much reduced near the cephalic 

 margin (Fig. 93); anal appendages of the usual type; ovipositor 

 short, the lateral valves pale, ventral margins slightly serrate; pro- 

 styles short and blunt. 



Measxirements 



Length, S 31-32 mm. 



Length, 9 31-32 mm. 



Length of abdomen, $ 24 mm. 



Length of abdomen, $ 26 mm. 



Length of hind wings, S 19-21 mm. 



Length of hind wings, 9 20 mm. 



Width of hind wings, S 4 mm. 



AVidth of hind wings, 9 4 mm. 



This species is most closely related to cakrrfi, from which the 

 female differs in having more black on the dorsum of the eighth 

 tergum and in the characters of the mesostigmal plates. The male 

 may be distinguished by means of the anal appendages. 



Described from a number of both sexes in the collection of Mr. 

 E. B. Williamson. The species has not been reported from Illinois, 

 but probably occurs here. 



Enallagma divagans Selys 



Nymph. — Unknown. 



Adult; Male. — Color, blue and black. 



Head blue and black ; labium pale, median lobe subtriangular, the 

 labial palpi including the distal segment pale, the proximal segment 

 narrow; antennae dark, the first two segments subequal, the first 

 pale at the tip; postclypeus black, anteclypeus except a small dorso- 

 mesal black spot, the mandibles, their trochantins, genae, and a trans- 

 \erse area above the fronto-clypeal suture pale blue; remainder of 

 the front black; vertex with pale subcuneiform postocular spots, 

 the remainder of the dorsal portion black; occiput and postgenae pale 

 blue or bufif with the exception of a large black spot laterad of the 

 occipital foramen on each side. 



