524 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



9. NOTES ON PROGOMPHUS BOREALIS, WITH A DESCRIPTION OF 

 ITS NYMPH. 



This western Progom'phus is apparently widely distributed through- 

 out Cahfornia/ but during the summer's collecting I have seen not 

 more than ten or twelve specimens on the wing. Perhaps the expres- 

 sion "widely distributed" should be used with some quaUfication as 

 under it I have included the evidence from the wide distribution of 

 the nymphs, which I have ascribed to this species. These nymphs 



Figs. 14S-154.— Progomphus borealis. 148. Color Pattern. 149. Segments 9 and 10 of female. 

 150-151. Segment 2 of male. 152-154. Segment 10 of male. 



seem to occur in the drifting beds of all the sand-bottomed streams of 

 central and southern California where there is a permanent flow of 

 water. 



I have the following records of adults: Chico River, five miles east 

 of Chico, California, several males caught on June 17, 1914; Coyote 

 Creek, San Jose, Cahfornia, two seen on July 4, 1914. Mr. Fordyce 

 Grinnell, jr., has collected specimens at Los Angeles, May 27, 1900, 

 and on Mount Wilson, August 3, 1904. He has also a record from the 

 Santa Rosa Mountains (Riverside County, California) and a specimen 

 from the San Jacinto Mountains, California, at an elevation of 2,500 

 feet, this taken June 17, 1908.^ The nymphs associated with this 



1 Calvert (Biol. Cent. Amer., p. 151) records borealis from both Oregon and Arizona as well as from west- 

 em Mexico, where it extends do\vn the west edge of the plateau as far as Uruapan. 



2 In August, 1915, 1 found borealis abundant in the Mojave River at Victorville. None were found in 

 the Owens River Valley nor In the Lehontin Basin. Apparently it does not occur immediately east of 

 the Sierras. 



