131 

 Smith and Pritchard: Odonota 



Fig. 4:46. Wings of Leucorrhi'ni'o intacta 

 (Needham and Westfall, 1955). 



U.S. and Mexico, West Indies) 



simp licico His (Say) 1839 



■ Face black across frons; abdominal appendages black 

 (British Columbia to Utah, California and Mexico) .... 



collocata (Hagen) 1861 



Naiad s 



1. Lateral anal appendages not more than one-half as long 

 as superior appendage simplicicollis 



■ Lateral anal appendages two-thirds as long as superior 

 appendage collocata 



— Lateral spines of abdomiiml legnwnt 9 dl 'nulls 

 convergent glacialis 



Genus Tarnetrum Needham and Fisher, 1986 



Two species of this genus, closely related to Sympe- 

 trum, occur in the United States. Those two speciee 

 are probably the commonest dragonflies in our area. 

 The adults can be found along roadsides, in fields, 

 and near ditches (fig. 4:51). 



Key to California Species 



Adults 



1. Vertex with tip emarginate; wings with orange suffusion 

 proximally and along costa; legs yellowish (British 

 Columbia and Wyoming, south to California, Mexico, 



Argentina) illotum (Hagen) 1861 



— Vertex with tip truncate; wings hyaline; legs black, 



(North America to British Honduras; Asia) 



corruptum (Hagen) 186 1 



Naiads 



1. Lateral anal appendages two-thirds as long as inferiors; 



lateral setae 9; mental setae 13 illotum 



— Lateral anal appendages half as long as inferiors; 



lateral setae 13-14; mental setae 17 corruptum 



Genus Leucorrhinia Brittinger, 1850 



This is a northern group of small, white-faced dragon- 

 flies. They have red or tawny bodies with hyaline 

 ■vings (fig. 4:46). The males are similar to the females 

 except that they are somewhat larger. 



Of the seven species in the United States, three 

 each California. 



The green and brown slender naiads are climbers 

 imong green vegetation. The naiads and adults occur 

 in and about sphagnum pools and boggy places. The 

 idults fly low near shore and are fond of bright 

 sunlight. 



Key to California Species 

 Adults 



1. Abdomen with middorsal pale triangles on segments 4 

 to 7 or at least 6 and 7 (Canada, northern U.S., Oregon, 

 California, Nevada, Utah) hudsonica (Selys) 1850 



- Abdomen without pale spots on segments 4 to 6 ... . 2 



2. Abdomen with a pair of pale spots on segment 7 

 (Canada, northern U.S., British Columbia to California) 



intacta Hagen 1861 



- Abdomen with ssgment 7 entirely black (Canada, north- 

 ern U.S., British Columbia to California) 



glacialis Hagen 1890 



No iads 



1. Dorsal hooks present on abdominal segments 7 and 8; 

 no distinct band on under side of abdomen .... intacta 



- Dorsal hooks absent on abdominal segments 7 and 8; 

 3 wide longitudinal dark bands on underside of abdomen 



2 



2. Lateral spines of abdominal segment 9 pointing straight 

 to rearward, with axes parallel hudsonica 



Genus Sympetrum Newman, 1833 



The species of this genus are mostly reddish in 

 color and are most abundant in the autumn (fig. 4:48). 

 They occur in or near ponds and wet meadows. They 

 are poor fliers and easy to catch. The beautiful red 

 colors fade in preserved specimens. 



Adults frequently congregate in large numbers in 

 sunny locations. The slender naiads crawl over the 

 bottom trash and vegetation in ponds. 



Key to California Species 



Ma les 



1. Tibia pale, at least on outer face 2 



Fig, 4:47. Wings of Erythrodiplax berem'ce 

 (Needham and Westfall, 1955). 



