NO. 2192. DRAG0NFLIE8, CALIFORNIA AND NEVADA— KENNEDY. 495 



preceded by an equal pale band, which is preceded by a very dark 

 band. A narrow band occurs on the extreme base of the femora.) 

 Femur of hind legs reaching apex of segment 4, and wings, which he 

 parallel, reaching to first third of segment 5. 



Abdominal segments 1 to 8 with wide lateral keels; these edged 

 with a single row of spicules and numerous long hairs (see fig. 45). 

 Color brown, with median dorsal stripe and lateral keels white. A 

 dark lateral stripe above lateral keel, a less consspicuous dark line 

 below. Segments 2-7 each with a white spot above anterior end of 

 lateral keel. 



The male organ on segment 9 is as usual in Zygoptera. The vulva 

 of the female has the outer valves edged with a row of 4-6 prominent 

 spines. Between these are smaller spines and long hairs (see fig. 48). 



The caudal gills narrowly oblanceolate, increasing in width to the 

 apical third, where the lateral gills are one-sixth as wide as long and 

 the median slightly more than one-sixth. From this point they taper 

 suddenly to the apical sixth, the last sixth being the attenuate apex 

 of the gill. The gills have two patterns of color — (1) a dark brown 

 stripe of pigment bordering the rib from the base to the middle of the 

 fin with a crescent of the same at the apex, and (2) a series of 5 or 6 

 intense black cross-bars produced by the pigmentation of the tracheal 

 branches in these areas. Edges of gills fringed with hairs. 



This nymph differs from Enallagma nymphs in having long hairs 

 on lateral keel as well as spicules. 



It differs from Ischnura in the female lateral vulvar valves having 

 four or more spines (in Isclmura only one or two very small spines, 

 in Enallagma four or more spines). 



5. A NEW GENUS BASED ON ISCHNURA DENTICOLLIS. 

 CELAENURA, new genus. 



Venation and stigmas as in Ischnura. Arculus at the second anteno- 

 dal: M3 arising basad of the fourth postnodal in the front wing and 

 basad of the third postnodal in the hind wing; anal bridge separating 

 from the hind margin of the wing as far before the anal crossing as 

 the latter is long; three post-quadrangular cells in each wing except in 

 the front wings of the types where there are fom-; antenodal costal 

 spaces with the basal twice the length of the middle, and about three- 

 fifths the length of the distal; quadrilateral of the front wing with the 

 basal and anterior sides equal or the anterior slightly longer and either 

 contained 2-2^ times in the posterior side (the preceding proportions 

 vary considerably owing to the variabihty of the anterior side, which 

 in one specimen is almost 1 ^ times as long as the basal side) . Stigmas 

 rhomboidal, in the male those of the front wings black, of the hind wings 

 brown ; the costal and distal edges shghtly longer than the basal and 

 posterior edges. Female with a minute, acute, ventral spine on the 



