Sept.,1905.1 Bueno: Notonecta of North America. 163 



1895. Gillette & Baker, Bull. 31, Tech. Ser. I, Agr. Exp. Sta., Ft. Collins, 

 Colo., p. 63. 



1897. Kirk., Tr. Ent. Soc. Loncl., p. 403. 



1899. Smith, Ins. X. J., p. 144. 



1902. Bueno, Jour. N. Y. Ent. Soc, vol. X, p. 231-2. 



1904. Kirk., Wien. Ent. Zeit. , pp. 94 and 132. 



1904. Lhl., Proc. U. S. X. M., vol. XXVII, p. 364. 



1905. Bueno, Jour. N. V. Ent. Soc, vol. XIII, p. 46. 

 N. impressa. 



1851. Fieb., Abh. Bohm. Ges. Wiss., (5), vol. VII, p. 475. 



1886. Uhl., Ch. Eist, p. 28. 

 -Y. rugosa. 



1S51. Fieb., 1. c, p. 476. 

 X. fabricii. 



1891. Towns., Proc. Ent. Soc Wash., vol. II, p. 56 (nee Fieb.).* 



Description. — "Head; notocephalic lateral margins fairly straight and nearly- 

 parallel, very slightly constricted near the base ; vertex little wider than synthlipsis, 

 which is about one fourth less than the width of the base of the eye Lateral and 

 humeral margins of the pronotum sinuate. Scutellum varying slightly in length, but 

 occasionally reaching and usually nearly reaching the base of the metanotum, black 

 ( Fieber in N. rugosa records two varieties i^cordigera and basalis) with yellowish 

 scutellum, but I have not seen them^. Hemielytra variable in pattern and color 

 * * * Wx, basal nervures crimson, the others yellow-brown. Pedes : cox?e black, 

 intermediate tibial spur small, slender, not tipped with black. Abdominis dorsum : 

 segment I black, 2-6 brilliant scarlet, 7-8 reddish-testaceous. Abdominis venter 

 black, connexivum and central carina green." (Kirk., Rev., pp. 403-4.) 



Long., 12.6 to 15.5 mm., lat., 4.8 to 5.6 mm. 



Distribution. — ■ My collection : Montreal, Quebec; Bearfoot Mts., B. C; Oil- 

 ley. ( iregon ; Woods Holl, Mass.; Albany, Long Island, X T ew York City and Staten 

 Island. Xew York; Delair and Palisades, X T . J.; San Luis Obispo, Claremont, Mt. 

 Diablo, Santa Clara Co. and Pasadena, California ; Humboldt Lake, Xevada (also 

 in coll. Van Duzee); Ft. Collins, Colorado (also Van Duzee coll.); U. S. National 

 Museum Collection: Hartford, Conn.; Indiana; Nebraska; Flagstaff, Arizona; 

 Colorado; Las Vegas, Xew Mexico; Warner Lake, Oregon; Salt Lake, Utah; 

 Palm Springs, Placer County, Santa Barbara and San Diego, California. Collection 

 Heidemann : Palo Alto, California ; Lakeside, S. D. Collection Ohio State Uni- 

 versity : Maine; Pine Ridge, Xebraska ; Peach Springs, Arizona. Black Hills, 

 Dakota (Am. Mus. X T . H); Orono, Maine, and Andover, Mass. (Flatch Exp. Sta.); 

 Da Costa, X. J. (38); Buffalo, X. Y. (53); Denver, Colorado (^ 1 3 ) ; Owens Valley, 

 California (43); Milk River region, Montana (44); Las Vegas Hot Springs, Xew 

 Mexico (52). I have also seen specimens from Mt. Katahdin, Maine. 



Ivirkaldy recognizes five color varieties (omitted in the preceding 

 copy of his description), but while such terms may at times be con- 

 venient, it is as difficult in this species, as it is in N. undulata to draw 

 a fixed line of demarkation to separate them. It ranges through vari- 



