THE SMALLER WATER STRIDERS. 991 



Drake (1920, 207) records it as common throughout Ohio, 

 and Hussey (1922, 35) as numerous in September among bul- 

 rushes in Berrien Co., Mich. 



1126 (1306%). Microvelia atrata Bueno, 1916a, 60. 



Wingless form — Elongate-oblong, sides subparallel, male; obovate, 

 female; finely pubescent and pilose. Head, pronotum except front mar- 

 gin, and middle of dorsum, dark reddish-brown; base of first antennal, 

 collar of pronotum, connexivum, both above and beneath, coxae and base 

 of femora, dull yellow; remainder of legs and antennae fuscous-brown; 

 under surface blackish. Head short, blunt, oval; eyes strongly protrud- 

 ing. Joint 1 of antennae stoutest, curved, nearly as long as 4; 2 — 4 

 gradually increasing in length, the fourth longest, fusiform. Pronotum 

 obtusely triangular, extending back to base of second dorsal, with a white 

 wing-pad protruding from beneath each humeral angle, its disk without 

 impressed line, finely and sparsely punctate. Genital segment visible from 

 above in both sexes. Winged form — Velvety-sooty-black with clavus and 

 corium milk-white at base and a white patch in middle cell. Length, wing- 

 less form, 1.6 — 1.8; winged form, 1.7 — 2 mm. 



R. P. Park, Fla., two specimens taken Dec. 16, one April 6 ; 

 all three by sifting bases of dense clumps of a tall wire-grass 

 growing in pine land one-fourth of a mile from water 

 (11\ S. B.) . Billy's Island, Okefenokee Swamp, Ga., June 

 (Bucuo). This is the type locality and it has heretofore been 

 recorded only from there. 



1127 (— ). Microvelia hinei Drake, 1920, 207. 



Winged form — Elongate-oblong, narrowed behind. Head and pro- 

 notum dark brown, the former with a line of whitish bloom along inner 

 margin of each eye, the latter with a yellowish transverse line behind its 

 front margin; elytra pale brown, clavus and corium each with an oblique 

 whitish stripe, corium with an oblique oval spot behind these stripes ; 

 membrane with three white spots, the apical one oblong; legs and pro- 

 notum dull yellow, tibiae and tarsi tinged with fuscous; under surface 

 dark brown, thickly clothed with fine bluish-gray pubescence. Antennae 

 reddish-brown; joint 2 shortest, 1 and 3 subequal, each about two-fifths 

 longer than 2, 4 longest. Head and pronotum rather thickly clothed with 

 very fine whitish hairs, the latter pentagonal and with a fine median 

 carina. Wingless form — Elongate-oval, male, slightly broader, female. 

 Ground color as above; abdomen with second, third and fourth dorsals 

 bluish with a narrow median yellow stripe, first and fifth dark brown 

 with a similar stripe, sixth and seventh bluish with an elevated polished 

 brown median line; connexivals each with a large median yellow spot. 

 Pronotum nearly four times as wide as long, with a transverse curved 

 row of punctures near front margin and another row behind middle. 

 Mesonotum visible, more than half as long as pronotum. Metanotal tri- 

 angles each about one-third as long as width of mesonotum. Side mar- 

 gins of connexivum straight, male, evenly curved, female. Nymphs broad- 

 ly oval. Length, 1.3 — 1.6 mm. 



