586 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 52. 



with greenish blue abdominal spots and the stripes on the thorax 

 blue above and creamy yellowish below. The abdomen of the latter 

 is brown shading darker caudad, the thorax brown, and the eyes 

 grayish, never as blue as in the male. The females, whether yellow 

 or blue, invariably had the blue dash in the eye. (See figs. 354, 

 366-375, and 380-381.) 



Abdomen (without appendages), 45-47 mm.; appendages, 6; hind 

 wing, 45-46. 



Nymph. — I have not been able to distinguish the nymph from that 

 figured by Walker ^ for interrupta interrupta. Some show the same 

 color pattern as figured in his monograph, while others show each 

 middorsal dark spot inclosing a pale spot as in my. figure of neva- 

 densis nymph. (See figs. 376-379.) 



Length of body, 34 mm.; men turn, 6.5 long, 5.5 broad; hind wing, 

 9-10; hind femur, 6.5; inferior appendages, 4-4.5; genital valves, 2; 

 width of head, 8; abdomen, 8. 



16. A NEW SPECIES OF AESHNA— ITS N^T^IPH AND ITS HABITS. 



This near relative of palmata was recorded first from Baja Califor- 

 nia by Calvert as constricta.^ Walker in his monograph ^ corrected 

 this determination, placing part of Calvert's material under palmata, 

 but noting the differences in coloration and structure between these 

 Baja specimens and true palmata. As Walker had only males he 

 deferred final judgment on the status of this form. 



In the collection of Stanford University I found seven males of this 

 species, which had been collected on the streams in Santa Clara 

 County, California, during September and October of previous yeai-s. 

 During these months in 1914 I was unable to collect, though on two 

 different occasions I saw individuals, which were probably this spe- 

 cies, on San Francisquito Creek west of the university buildings. On 

 January 6, 1915, I found 14 exuviae on Los Trancos Creek, which is a 

 stream of the Coast Mountains west of Stanford Univereity. Other 

 exuviae were collected on Arroyo Seco at Pasadena, California. Dur- 

 ing the summer of 1915 I collected nymphs in Mission Creek, back 

 of Santa Barbara, Cahfornia, and 16 males and 8 females on the 

 streams of Santa Cruz Ishmd, which lies 23 miles south of Santa Bar- 

 bara. Numerous nymphs and exuviae were collected here also. 



My few observations and the data on the Stanford specimens in- 

 dicated that this species around Palo Alto emerges during August, and 

 is on the wing until November. It is a stream species with habits 

 similar to those of palmata. It inhabits the warmer frost-free streams 



1 The North American Dragonflies of the genus Aeshna. University of Toronto Studies, Biol. Series 

 No. n, 1912, pi. 6, fig. 2. 



2 Odonata of Baja California, Mexico. Troc. Cal. Acad. Sci., ser. 2, vol. 4, 1895, p. 509. Specimens from 

 La Chuparosa, October, 1893. 



3 North American Dragonflies of the fienus Aeshna, 1912, p. lG-4. • 



