292 CALIFORNIA ACADEMY OF SCIENCES. 



Pedinocoris macronyx Mayr. A few specimens have 

 been brought from various parts of Lower California by 

 different collectors. 



Serphus dilatatus Say. Several specimens were se- 

 cured at Santa Maria and San Fernando, in May, by Mr. 

 C. D. Haines. 



NEPIDyE. 



Ranatra quadridentata Stal. Several specimens 

 of this form were taken at San Jose del Cabo by Dr. 

 Gustav Eisen; and at Comondu, in March, by Mr. C. D. 

 Haines. 



Ranatra fusca Pal. Beauv. A specimen of this spe- 

 cies was secured at Comondu, in March, by Mr. C. D. 

 Haines. 



notonectid^. 



Notonecta mexicana Am, et Serv. Numerous spec- 

 imens of several varieties were taken at Comondu and El 

 Paraiso, in March, April and May, by Mr. C. D. Haines. 



Notonecta undulata Say. Several specimens of 

 this insect were collected near Cape St. Lucas by Mr. 

 John Xanthus. A specimen in the collection is labeled 

 "Shasta County, Cal." 



Notonecta shooterii n. sp. 



Shorter and more robust than JV. imfrcssa Fieber, but 

 not so thick anteriorly as N. mexicana Amyot; ground 

 color dull ivory-white, with the scutellum, inner margin 

 and apex of the clavus, streak near the basal angle of the 

 corium, posterior half of corium, excepting a triangular 

 spot on middle of apex, the outer submargin, and the 

 membrane, omitting a large space next the tip, black. 

 Head of medium breadth, the face gradually narrowing 

 towards the lower end of the eyes, wider at base than in 

 IV. mexicana, and granulated in a space there which is 



