554 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



low stripe slightly more than its width from a very narrow paler 

 humeral stripe. A narrow pale spot on the lower end of the first 

 lateral suture. Second lateral suture entirely brown. Wings with 

 costa yellow; ptcrostigma yelloAvish, edged with dark brown. Legs 

 yellow, a short antero-dorsal stripe on apical end of femur extending 

 usually less than half its length; tibiae black, yellow externally; 

 tarsi dark. 



Abdomen with segments 1-6 greenish yellow and 7-10 deeper, pure 

 yellow, markings black. Segment 1 with pale spot above on either 

 side connected posteriorly with a pale stripe on segment 2, which 

 stripe is darker in its posterior half. Apex of segments 2-6 with a 

 narrow black ring. Each of 3-6 with a small spot posterior to the 

 lateral carina and a large spot, covering two-fifths of the side, on the 

 distal end of the segment. Segments 7-10 deep yellow, segment 7 

 marked similarly to segment 6, but the spots reduced in area and 

 paler. Segment 8 with broad dorsal apical pale brown area. Supe- 

 rior appendages yellow with ventral apical face black. Inferior 

 appendages yellow with tips black. 



Female. — Similar to the male but segments 7-9 with distinct 

 apical spots. Five of the nine females have the antehumeral stripes 

 reaching the mesostigmal lamina. In three the narrow humeral 

 stripe is so faint as to appear wanting. In four females segment 9 is 

 entirely yellow. (See figs. 248-249.) 



The following are the measurements of the 18 Humboldt specimens: 

 Male, abdomen, 35-43 mm.; hind wing, 27-29; female, abdomen, 

 37-38 mm.; hind wing, 31-32. 



I had the privilege of examining the following specimens of Gomphus 

 intricatus which belong to the United States National Museum: Kio 

 Grande River, Brewster County, Texas, Mitchell and Cushman, col- 

 lectors, 1 male, 2 females; Albuquerque, New Mexico, Cockerell, 1 

 male; Chaves, New Mexico (P. P. Calvert), 1 female. 



Except that the color pattern is slightly darker in the Rio Grande 

 specimens, approaching almost to black, I can see no difference 

 between the Rio Grande and Nevada series. 



GOMPHUS OLIVACEUS Selys. 



This is a large species found on warm muddy rivers, I have taken 

 it in two places. On July 15 and 16 I took about 80 males and 6 

 females on the American River just below the Southern Pacific Rail- 

 road bridges at Sacramento. September 2 I took a single female 

 on the dikes of the San Joaquin River at Stockton.* 



1 Ferris took this on Bean Creek near Modesto, California (see p. 630), which is its present farthest south 

 record in the San Joaquin Valley. In August, 1915, I found this dark form on Owens River, Inyo 

 County, California. Kirby (Catalogue of Odonata, p. 65, 1890) records this from Nebraska. I do not 

 know ills authority. Walker (41st Kept. Ent. Soc. Ont., 1909, p. 120) records It from Peachland, British 

 Columbia, which is in the Columbia River watershed. The exuviae recorded by Needham from Seattle, 

 Washtagton, as sobriniis (Proc. U. S. Nat. Mus., vol. 28, p. 692) are of this species. 



