No. 39] ODONATA OF CONNECTICUT : COENAGRIONIDAE 83 



appendages are seen to have broad basal lobes, which are often 

 contiguous ; inferior appendages short, subcorneal, and directed 

 obliquely dorsad ; tenth sternum pale. 



Female. — Color similar to the male. 



Head : front with more blue, and the spots ventrad of the ocelli 

 larger than in the male and sometimes connected with the blue 

 area of the front. 



Thorax : dorsal black stripe divided by a brown line on the 

 meson; mesostigmal plates (Fig. ii, No. 8) pale blue, the lateral 

 angles elevated and not reaching the katepisterna. 



Abdomen: (Fig. ii. No. 21) dorsum of tergum i with a black 

 basal spot, 2-7 inclusive with longitudinal dorsal black stripes 

 widened suddenly near the caudal margins, and narrowed to the 

 meson near the cephalic margins ; tergum 8 blue with a narrow 

 dorsal stripe extending a little over half the length of the tergum 

 from the base; terga 9 and 10 blue, 9 sometimes with two black 

 basal triangles. 



Measurements: total length, male 27-31, female 29-31 mm.; 

 length of abdomen, male 22-25, female 23-25 mm. ; length of hind 

 wings, male 17, female 17-18.5 mm.; width of hind wings, male 

 3.25, female 3 mm. 



Connecticut. — Guilford (Pistapaug Pond), 27 July, 1920 (P. G.). 

 New England. — June 19-August 19. 



Group 5 



Enallagma durum Hagen 



Synopsis of the Neuroptera of North America, 87: 1861. 



Nymph. — Mental setae 3, laterals 4. Lateral keels of the abdo- 

 men sparsely setose, the setae not rounded conspicuously at the 

 apices; gills long and narrow (PI. i, Fig. 11), thickly provided 

 with tracheae and having a brownish tint along the axis. 



Measurements: length of gills, about 7.5 mm.; width, 1.5 mm. 



Described from one nymph obtained from Howe and several 

 others, identified by comparison, obtained at East Haven, Conn, 



Adult, male. — Color blue Or buff (teneral) and black. 



Head : labium buff ; labrum, mandibles, genae, anteclypeus, 

 cephalic margin of the postclypeus, and the front dorsad of the 

 clypeus to the antennal fossae, blue or pale; vertex black; post- 

 ocular spots cuneiform, connected with the postocellar pale stripe; 

 occiput and postgenae pale. 



Thorax : pronotum black, the cephalic lobe largely blue, large 

 lateral spots on the median lobes and the caudal margin, which 

 are also blue ; mesostigmal plates triangular, the lateral angles 

 and caudal margins blue; dorsal carina blue, bordered on each 

 side by broad black stripes occupying half the anepistema; pale 

 stripe of the anepisterna very little broader over the katepisterna, 



