141 



Smith and Pritchard: Odonato 



Fig. 4:68. Dorsal views of male abdominal appendages of 

 -estes. a, o/acer; b, disjunctus; c, congener; d, dryas; e, stulfus; 

 f, unguiculotus (Celeste Green). 



and northern U.S.; British Columbia to Utah and Cali- 

 fornia in West) unguiculatus Hagen 1861 



Ventral abdominal appendages (as seen from above) 



straight distally 5 



, Dorsal abdominal appendages with a differentiated 

 tooth at distal end of median expansion (fig. 4:686) 

 (Alaska, northern U.S. to northern Mexico, and Cali- 

 fornia) disjunctus Selys 1862 8 



Dorsal abdominal appendages without a differentiated 



tooth at distal end of median expansion (fig. 4:68a) 



(northern Mexico, and California south to Guatemala) 



alacer Hagen 1861 



Fema les 



Thorax with dorsum metallic greenish dryas 



Thorax with dorsum brown or black 2 



Occiput largely yellowish; abdomen with a greenish 



tint unguiculatus 



Occiput blackish except around foramen; abdomen not 



greenish 3 



Metepimeron with a black spot anteroventrally and 

 ventral ly 4 



L. disjunctus (see 



:„■ l ,-■ 



"California record of L. forcipatus prob. 

 talker, 1952). 



Fig. 4:69. Lesres dryas naiad, a, lateral view; b, labium; 

 c, dorsal view; d, head (Kennedy, 1915). 



— Metepimeron with anteroventral black spot indistinct 

 or absent and ventral spot absent 5 



4. Abdominal segments 4 to 7 with a separate postero- 

 ventral stripe on each side stultus 



— Abdominal segments 4 to 7 without a posteroventral 

 stripe on each side congener 



5. Abdomen mostly black above disjunctus 



— Abdomen largely pale alacer 



Naiad s 



1. Lateral setae 4-5, 3 or 4 of these on movable hook 

 and one before its base; mentum of labium broad at its 

 proximal end, its narrowest width equal to about one- 

 third its width at the bases of the lateral lobes .... 



congener 



— Lateral setae normally 3; mentum of labium narrow at 

 its proximal end, its narrowest width equal to about 

 one-fifth to one-eighth its width at the bases of the 

 lateral lobes 2 



2. Slender proximal part of labial mask at least twice as 

 long as expanded distal part (fig. 4:696); ovipositor 

 extending beyond apical margin of segment 10 3 



— Slender proximal part of labial mask not more than 1.5 

 times as long as distal part; ovipositor just reaching 

 apical margin of segment 10. . unguiculatus and stultus 



3. Mentum of labium 4.3-5.1 mm. long, reaching apex of 

 hind coxae or slightly beyond (fig. 4:69d); ovipositor 

 3-3.5 mm., extending beyond basal joint of gills . . dryas 



— Mentum of labium 4.75-5.5 mm., reaching beyond apex 

 of hind trochanters; ovipositor 2 mm. long, extending 

 very little beyond apical margin of segment 10 



disjunctus 



'Naiad of alacer Hagen is undescribed. 



