117 

 Smith and Pritchard: Odonata 



!• 



Fig. 4:18. Wings of Ophiogomphus carolus 

 (Needham and Westfall, 1955). 



Naiads 



1. Dorsal hooks rudimentary or absent on abdominal 

 segments from 4 to 9; lateral spines on 6 and 9 smaller 

 than on 7 and 8 lampropeltis Kennedy 



- Dorsal hooks vestigial on 7 to 9; lateral spines about 

 equal in size on 6 to 9 compositus Hagen 



Fig. 4:19. Naiad characters in the genus Ophiogomphus. a, 0. 

 bison; b, 0. morrisoni; c, 0. severus; d, 0. morrisoni nevadensis; 

 e, 0. occidentis; 1, mentum; 2, teeth and setae on middle lobe of 

 'mentum; 3, dorsal view of abdominal segments 6-10 (Kennedy, 

 1917). 



t^BBfcA 



Fig. 4:20. Ocfogomphus specularis. a, second abdominal seg- 

 ment of male; b, dorsal view of male abdominal appendages; c, 

 ventral view of male abdominal appendages; d-e, male abdominal 

 appendages applied to head of female; f, ventral view of female 

 abdominal segments 9-10; 9, female thoracic color pattern varia- 

 tion; h-k, color variation in male abdominal segment 9; ', male 

 color pattern; m, female color pattern (Kennedy, 1917). 



Genus Gomphus Leach, 1815 



Gomphus is a very large Holarctic genus, the members 

 of which breed in diverse aquatic environments. 

 Although many species occur in the eastern United 

 States, only three are known from California. The 

 naiads have special hooks for burrowing in silt. 



Of the California species, Gomphus intricatus and 

 G. olivaceous develop in warm and muddy streams or 

 sometimes ponds. G. confraternus confraternus 2 Selys 

 1873 (=sobrinus Selys 1873) is also found in sluggish 

 streams of the valleys. However, G. confraternus 

 donneri is found in clear mountain lakes. This sub- 

 species differs from the nominate subspecies in that 

 the yellow spot on the ninth abdominal segment is 

 smaller. 



2 Gloyd (1941) showed Gomphus confraternus to be a synonym 

 of C. kurilis Hagen (1857). We prefer to use the better known 

 name. 



