NO. 2192. DRAG0NFLTE8, CALIFORNIA AND NEVADA— KENNEDY. 557 



Abdomen with segments 1-6 gray, and segments 7-10 creamy- 

 yellow, marked as follows: Segment 1 with, a narrow black stripe 

 above on either side which connects with a similar stripe on segment 

 2, on the latter segment the stripe widening caudad. Segments 2-7 

 each with a lateral stripe as in segment 2, and in the lower posterior 

 angle of the side a spot, on segments 6 and 7 this spot usually con- 

 nected with the stripe above. Intersegmental membranes of seg- 

 ments 7-10 yellow. Segment 7 with the lateral stripes meeting along 

 the dorsal carina for the posterior two-thirds of its length. Seg- 

 ments 8 and 9 with the lateral stripes broadly united across the pos- 

 terior end of each segment, leaving on segment 8 a round antero-dorsal 

 spot one-half the segment's length in diameter and on segment 9 a 

 more rectangular antero-dorsal pale spot one-third the length of the 

 segment. Segments 8 and 9 edged below with black. Segment 10 

 black above, yellow on the sides. Appendages brown with black 

 tips. This species is characterized by the continuous lateral stripes 

 on the abdomen, the lateral spots on segments 3-7 and the general 

 grayish color of the body. 



The coloration of the female (fig. 251) is similar to that of the male. 



The following are the measurements of 8 males and the 6 females 

 of olivaceus taken at Sacramento: 



Male, abdomen, 37-40 mm.; hind wing, 31-33; female, abdomen, 

 38-43 mm.; hind wing, 32-35. 



GOMPHUS OLIVACEUS Selys, var. NEVADENSIS Kennedy. 



This variety was first taken by Henshaw, whose specimens are 

 probably in the Museum of Comparative Zoology. Hagen * lists these 

 specimens as olivaceus. 



I found this variety only in the Humboldt River, where I took it at 

 Golconda, Nevada, August 7 and 9; Winnemucca, August 8; and 

 Lovelocks, August 10. I did not find it in the swifter parts of the 

 upper reaches of the river at Carlm. 



From Golconda to Humboldt Sink, the Humboldt River is a muddy 

 alkali stream, which meanders with many involved loops through 

 this treeless valley. Its banks and bed are of alkali silt and it is bor- 

 dered at every turn by dense thickets of gray willow, which are called 

 pinwillows by the cowpunchers, because they seldom get larger than 

 an inch in diameter. At this size they die and remain erect among 

 the younger sprouts, making a thicket scarcely penetrable except by 

 animal trails. The smTounding momitains are brown and bare and 

 treeless, not even cottonwoods growing along this strange stream. 



Both males and females were found most commonly in these wiUow 

 thickets. They sunned themselves here, but every now and then one 



1 Rept. Surv. Terr. Colo., 1873, p. 397, 1874. 



