THE WATER-BOATMEN. 1067 



subcylindrical, slightly curved inwardly, about five times as 

 long as thick, nearly three times as long as tibiae, ending in a 

 single claw, about one-third as long as pala itself and with two 

 rows of long bristles. Other characters as in key. Five species 

 are known, one from North America. 



1206 ( — ). Cymatia Americana Hussey, 1920, 82. 



Head green, vertex with two large brown spots on hind margin; 

 pronotum as in key; elytra olive-green, clavus with oblique black lines, 

 these heaviest near base, there often broken or with outer end forked, 

 corium sparsely and irregularly punctate with black and with numerous 

 irregular blackish spots, these tending to form two or three irregular 

 longitudinal rows; costal area whitish, its outer edge blackish posteriorly; 

 membrane narrow, lightly spotted with fuscous; legs dull yellow; ventrals 

 blackish, male, greenish, female. Front of head feebly concave, male, 

 fiat, female, clothed with long erect whitish pubescence; vertex about one- 

 fourth narrower at base than in front. Pronotum about twice as wide 

 as long, carinate in front. Length, 7.4 — 8.3 mm. 



Recorded only from Michigan, Minnesota and North Dakota. 

 Hussey reports it as hibernating in groups of 10 to 50 in- 

 dividuals in air pockets in the ice covering a small pond near 

 St. Paul, Minn. 



III. Ramphocorixa Abbott, 1912, 120. 



Species of medium size having the head of male sharply 

 acuminate, strongly carinate, about one-third longer than 

 pronotum, its frontal fovea acorn-shaped ; pronotum lenticular, 

 rastrate ; palae as in generic key, shining ivory-white, much 

 longer than tibiae, terminated by a long serrated spine ; front 

 femur with a large stridular area of minute spines. Male with 

 asymmetry of apical ventrals dextral, dorsal segments 5 — 7 

 divided, the strigil minute. Female with a small circular fovea 

 between the lower inner angles of the eyes ; palae oblong, cul- 

 tivate. One species is known. 



1207 (1421). Ramphocorixa acuminata (Uhler), 1897a, 392. 

 Narrow, shining, minutely rastrate, bluntly rounded behind. Head 



yellowish; pronotum grayish-brown with three complete and two shorter 

 brown lines ; elytra pale silvery-gray, the usual transverse dark marking 

 very faint; membrane subhyaline, margined with brown, male; dorsum 

 black edged with paler; under surface white, ventrals 3 — 5 with two 

 oblong black bands each side, genital segments pale; female with dorsum, 

 legs and ventrals pure white. Structural characters as under genus 

 heading. Length, 4.3 — 5.5 mm. 



Eastland Co., Tex., May 24 (British Mus. Co!!.). Recorded 

 from northern Illinois, Missouri, Kansas and Texas. It is 



