No. 2192. DRAG0NFLIE8, CALIFORNIA AND NEVADA— KENNEDY. 489 



transverse row of short spines at the base of the distal or spatulate 

 lobe (see figs. 24 and 32, and compare with figs. 35 and 38-42). 



Color blue and black, with blue postocular spots and a striped 

 thorax. 



This genus differs from Coenagrion in the male having nine external 

 tibial spines and the female having a vulvar spine, also in the penis, 

 which in typical Coenagrion {puella Linnaeus) has a divided tip (see 

 fig. 42). It differs from Enallagma in the high forked apex of seg- 

 ment 10 in the male, in the coloration, and in the penis which in 

 Enallagma is of the type shown for Enallagma civile Hagen (see 

 fig. 41). 



From Isclmura it differs in having stigmas similar in front and 

 hind wings and in the origin of Mj as well as in the penis (see figs. 

 70-81). Yrom Acanthagrion gracile (fig. 37) it differs in that A arises 

 basad of the anal crossing. (See also figs. 33, 34, and 36.) 



Type of the genus. — Agrion exclamationis Selys.* 



The name proposed is suggested by the heavily banded caudal 

 gills of the nymph. ZuvLov = Si httle girdle; aTptoi^ = living in the 

 fields, wild, savage — the name of a genus of dragonfhes. 



4. NOTES ON ZONIAGRION EXCLAMATIONIS AND ITS NY^IPH. 



It was my good fortune to rediscover Selys's Agrion exclamationis. 

 This species had been described by Selys in 1876 from a single male 

 in the collection of McLachlan, since which time no other specimens 

 had been coUected. (See figs. 19-32, 43-52.) 



On May 17, 1914, while collecting west of the Stanford campus, I 

 found tliis species very abundant about the permanent pools in San 

 Francisquito Creek. It was most abundant in the half mile below 

 the Searsville dam. Two hundred feet below the dam was a pool 

 fifteen feet across and four feet deep the sides of which were bordered 

 by mud banks fringed with a rank growth of Sparganium. A few 

 males and numerous females were flying in and out among the rank 

 stalks of tliis plant, wliile several females were ovipositing in the tips 

 of the leaves which hung over and touched the surface of the water. 



The eggs are inserted in the tissue of the leaf blade in a zigzag row 

 (see figs. 50-52). The female, unassisted by the male, backs down 

 until the abdomen is submerged, when she inserts the first or lowest 

 egg of the series. The second is inserted after moving up a short dis- 

 tance. (In most agrionines the female moves down as she oviposits.) 

 With each move up she moves slightly to one side or the other, leaving 

 a zigzag row of incisions below her. 



These Sparganium clumps had many exuviae of this species cHnging 

 to them. A careful examination of their roots, which hung in masses 

 in the edges of the pool, brought to fight several five nymphs. These 

 were carried to the laboratory, where they emerged a few days later. 



> Bull. Acad. Belg. (2), vol. 41, 1876, p. 1251. 



