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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, with 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 pinkish, 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 braunen grund, 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 almcst 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. 
