hungerford: aquatic hemiptera. 171 



semi-transparent, smoky, nervures brown (pale vars.), or semitrans- 

 parent, smoky black, nervures blackish-brown (dark vars.">. Abdominis 

 dorsum black (dark vars.), or rufoluteous with paler genital segments 

 (pale vars.). Abdominis venter varying from black to testaceous. 

 "Long., 11 to 14 mm.; lat., 4.5 to 4.8 mm." — Bueno and Kirkaldy. 



Bueno adds: 



"The shape of the head and the very transverse pronotum separate it 

 very readily from the other species of the genus. In his revision, Kirk- 

 aldy goes at length into the color variations, and since his remarks cover 

 the ground exactly, I reproduce them here: 'The hemelytra are usually 

 rich scarlet, vdth black membrane, but the latter hue often extends beyond 

 the apical margins of the clavus and corium; the scarlet also varies much 

 in shade, graduating in one direction to pale greenish-white through pale 

 yellow, pale olive-green, deep yellow, orange, and pinlcish, and in the 

 other through crimson and violet-red to deep violet-black, though in 

 the last the sutures of the hemelytral divisions are usually narrowly 

 violet-red ; in some specimens the apex of the corium is black, from the 

 base of the membrane to the margins of the hemelytra in a straight line, 

 and the rest of the hemelytra are rich crimson. The hemelytra are 

 rarely maculate, occasionally the center of the clavocorial suture has a 

 more or less pronounced black smudge about the center. It may be con- 

 venient to propose the varietal names ceres for the pale-colored forms 

 and. hades for the southern violet-black race. Herrich-Schaffer notes a 

 variety with a large central ochreous stripe on the scutellum, while Fieber 

 describes among the varieties with red hemelytra: (1) Schild schmut- 

 ziggelb mit bramien grnud, and (2) Schild braun mit gelblichem rand' — 

 these three varieties I have not seen. In the U. S. National Museum and 

 Heidemann collections the specimens from Colorado Canon, Hot Springs 

 and Catalina Mountains, 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." 



Localities: Colorado, Arizona, California. Uhler gives its distribu- 

 tion as "western states." 



Notonecta irrorata Uhler 1876. 



"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 N. 

 triguttata, etc. Pronotum much wider basally than apically, lateral 

 margins not sinuate, humeral angles acute, humeral and posterior mar- 

 gins sinuate. Hemelytra rich black, irrorated (especially on the clavus) 

 with refulgent yellow brown, anterior lobe of membrane and apex of 

 exterior lobe smoky. The irrorations vary greatly in different individ- 

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

 the whole of the clavus 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. Abdominsis dorsum: first to fifth 

 segments black, sixth, seventh and eighth sordid grayish-brown. Ab- 

 dominis venter black. 



"Long., 11.8 mm. to 14.4; lat., 3.6 to 4.7 mm." — Bueno and Kirkaldy. 



Localities: Illinois; Kentucky; Ohio; Tennessee; Montana; Quebec; 

 Maryland; New York; Washington, D. C; Rhode Island; Indiana; New 

 Jersey; Ontario; Maine, Massachusetts; Michigan; Florida; New Hamp- 

 shire; and Connecticut. 



