THE WATER-BOATMEN. 1081 



the yellow ones sometimes forked ; eorium sparsely pilose and with 

 unequal, crowded, undulate pale marking, its inner angle and costal area 

 with a blackish stripe; membrane with sutural line narrow, dentate, its 

 disk with sparse flexuous lines; dorsum, sterna and xyphus black; four 

 basal ventrals black in male, two in female. Male with frontal impres- 

 sion obovate, equalling eyes ; pala short, wide, cultrate, its dorsal margin 

 curved, base beneath produced in an obtuse angle. Length, 5 mm. 



A palaearctic European species recorded by Fieber (1851a, 

 35) from Pennsylvania, under the name Corisa limitata Fieb., a 

 synonym. 



1242 (1457). Arctocorixa vulnerata (Uhler), 1861, 284. 



Blackish-fuscous; upper surface uniformly rastrate; pronotum yel- 

 low with seven black lines, two of them forked; clavus with yellow lines 

 on base enth - e, those behind middle interrupted at inner suture, middle 

 ones broken; lines of eorium broken, subparallel, the oblique one at 

 membrane yellow; membrane with very serpentine lines, radiating to- 

 ward but not reaching inner margin ; marginal area yellowish-white ; 

 ventrals dusky at base; dorsum black; connexivum yellow, its incisures 

 black ; legs yellowish-white, tarsi in part black. Pala cultrif orm, slightly 

 curved at tip, its middle hardly broader. Length, 7.5 mm. 



Described from the State of Washington and recorded by 

 Uhler (1876, 341) from Montana, Oregon and northern Illinois. 

 "Remarkable for having very fine scratched transverse lines 

 bounding some of the lines of thorax." (Uhler). 



V. Hesperocorixa Kirkaldy, 1908, 118. 



This genus, as characterized in the generic key, p. 1065, is 

 represented by a single known species. 



1243 (1460). Hesperocorixa brimleyi Kirkaldy, 1908, 120. 



Elongate-oblong, robust. Above shining reddish-brown, basal fourth 

 of clavus and a large spot near apex of eorium blackish-brown; head 

 wholly, or in part, front legs and middle femora pale greenish-yellow; 

 middle tibiae and hind legs dull yellow with a strong reddish tinge; under 

 surface brown, the genitals and narrow side margins of ventrals yel- 

 lowish. Pronotum lenticular, three times as wide as long, very minutely 

 strigose, its hind margin broadly rounded. Elytra with sides parallel to 

 apical fourth, then tapering to the narrowly rounded tips. Male with 

 frontal depression very faint; pala? cultrate with about 28 pegs; strigil 

 rather large, oblong-oval. Length, 8.5 — 9.5 mm. 



Raleigh and Wendell, N. Car., March 26— April 12 (Brimley) . 

 Described from Raleigh and not recorded elsewhere. Easily 

 known from all other Corixids by its smooth polished upper 

 surface devoid of cross-lineations and the peculiar coloration. 



