J. 2192. DRAGONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 497 



Santa Clara Comity, California, on May 15, 1915. Sharon Pond is 

 an artificial pool 200 feet long and 3 feet deep on the estate of the same 

 name west of Stanford. The single male was collected by sweeping 

 in the sedges growing about its borders. The three specimens from 

 San Jose were collected in the sedges along the edge of Coyote Creek, 

 wliich at this season is a sluggish and almost stagnant stream. I 

 have no data that would indicate that the habitat and habits of this 

 species differ from those of denticollis, except that this has been found 

 in only the two places mentioned, while denticollis is found throughout 

 the southwestern States and northwestern Mexico. A fuller discus- 

 sion of Coyote Creek and its odonate fauna is given on page 596 of 

 this paper. The following is a description of this species: 



CELAENURA GEMINA, new species. 



This is a small species with coloration almost identical with that of 

 denticollis. (See figs. 53-55 and compare with figs. 56-58.) 



Type.— C&t. No. 20816, U.S.N.M. A male, from Coyote Creek, 

 San Jose, Santa Clara County, CaUfornia, May 15, 1915. 



Allotype.— Cut. No. 20816, U.S.N.M. A female, from Coyote Creek, 

 San Jose, Santa Clara County, Cahfornia, May 15, 1915, taken in 

 copulation with the type. 



Length of abdomen: Male, type, 19 mm.; of the remaining two, one 

 measures 19, the other 22 mm. ; female, allotype, 21. Length of hind 

 wings: Male, type, 14 mm.; of the remaining males, one measures 15, 

 the other 16; female, allotype, 17. 



Male structure. — As compared with other species of this group (Cera- 

 tura, Anomalagrion and IscTinura) this, for its size, is fauly robust. Head 

 with shallow antennal fossae and a prominent occipital ridge. Pro- 

 thorax with the posterior lobe half the length of the middle lobe and 

 slanting caudad and dorsad at an angle of 45°. This lobe is thin 

 antero-posteriorly and viewed from in front slightly concave on each 

 lateral edge, but evenly convex on the posterior edge. A tuft of long 

 hairs on each outer end of the middle lobe. Femur of front leg with a 

 single internal basal spine, a single internal apical spine and 5-6 

 external spines ; femur of the middle leg with 8 internal and 8 external 

 spines; of the hind leg with 12 internal and 10 external spines. 

 Tibia of fore leg with 2 spines above the comb and 2 below and 8 

 internal spines; of middle leg with 13 internal and 8 external spines; 

 of hind leg with 18 internal and 11 external spines. Hind femur 

 reaching to second third of segment 2. A large, hairy, hemispherical 

 tubercle on the ventral side of the metathorax. Wings extending to 

 apex of segment 6, with rhomboidal stigmas, those of the fore wing 

 black, of hind wing brown. Penis of the two-horned ischnuran type 

 but without the pair of large internal spines (fig. 92). The terminal 

 processes ("horns") one-half longer than in denticollis; two minute 

 65008°— Proc.N.M.vol.52— 17 32 



