Sept., 1905.1 Bueno : Notonecta of North America. 159 



pronounced black smudge about the center. It may be convenient to 

 propose the varietal names ceres for the pale-colored forms and hades 

 for the southern violet black race. Herrich-SchafTer (1. c, p. 43) 

 notes a variety with a large central ochreous stripe on the scutellum, 

 while Fieber (1. c, p. 475) describes among the varieties with red 

 hemielytra : (1) "Schild schmutziggelb mit braunem grund," and 

 (2) "Schild braun mit gelblichem rand" — these three varieties I 

 have not seen. In the U. S. National Museum and Heidemann col- 

 lections the specimens from Colorado Canon, Hot Springs and Cata- 

 lina Mts., Arizona, are var. hades, and above the average size and with 

 more prominent eyes. In the National Museum there is a specimen 

 from Mexico which has the scutellum with the yellowish base (or 

 apex) mentioned by Fieber (1. c, p. 475). 



7. Notonecta irrorata Uhler. 

 Notonecta irrorata. 

 1876. Uhler. 



1S76. Glover, Ms. Notes, p. 54. 

 1878. Uhl., Pr. Host. Soc. N. H., vol. XIX, p. 443. 

 1SS3. Packard, Guide, p. 537. 

 18S6. Uhl., Ch. List, p. 28. 



1891. Summers, Bull. Agr. Exp. Sta., U. of Term., vol. IV, No. 3, p. 8?. 

 1894. Van Duzee, Bull. Buff. Soc. Nat. Sci., vol. V, No. 4, p. 86. 

 1897. Kirk., Tr. Ent. Lond., p. 418. 

 1S99. Smith, Ins. N. J., p. 144. 

 1900. Osborn, Contr. Dept. Zool. and Ent., O. S. U., No. 2, 8th Ann. Kept. 



O. St. Acad. Sci., p. 79. 

 1902. Bueno, Journ. X. V. Ent. Soc, vol. X, pp. 231 and 235. 



1904. Kirk., Wien. Ent. Zeit., p. 132. 



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



N. or n at a. 



? Fitch Ms. (Signoret Coll.).* 



Description. — "Head small, notocephalic lateral margins diverging widely, 

 vertex a little more than three times as wide as the synthlipsis ; width of vertex and 

 of the eye subequal ; eyes rather larger proportionally than in X. trigutiata, etc. 

 Pronotum much wider basally than apically, lateral margins not sinuate, humeral 

 angles acute, humeral and posterior margins sinuate. Hemelytra rich black, irroraled 

 (especially on the clavus) with refulgent yellow brown, anterior lobe of membrane 

 and apex of exterior lobe, smoky. The irrorations vary greatly in different indi- 

 viduals ; in some the corium and membrane are almost immaculate, in others the 

 whole of the valvus and corium is irrorated, imparting a checkered appearance, while 

 in others the clavus is rich (almost metallic) yellow-brown with faint distant narrow 

 black lines. Alar nervures brown. Pedes : intermediate tibial spur small. Abdo- 

 menis dorsum : first to fifth segments black, sixth, seventh and eighth sordid grayish- 

 brown. Abdominis venter black." (Kirk., Rev., p. 418. ) 



