THE WATER-BOATMEN. 1071 



former with an evident, but faint median carina, the latter finely pubes- 

 cent. Pala of male as in fig. 215, b. Length, 10 — 11 mm. 



Marion Co., Ind., Aug. 16 — Oct. 9; common among masses 

 of water-weeds in spring-fed ponds. Ranges from New York 

 and New Jersey west to Minnesota and Kansas and southwest 

 to Oklahoma and Texas. 



1212 ( — ). Arctocorixa lobata Hungerford, 1925a, 143. 



Dark brown; head, legs and ventrals yellow; pronotum crossed by 

 about eight broad black bands ; elytra with pale markings much as in 

 obliqua. Membrane more or less separated from corium by fusion of the 

 pale cross-lines. Male with frontal depression of head less distinct, its 

 sides reaching the eyes. Pronotum coarsely rastrate, its median carina 

 scarcely evident. Pala of males elongate, sides nearly parallel, slightly 

 broader near the rounded tip. Left clasper of male with a prominent 

 lobe in front of base of right one. Length, 9.4 mm. 



Recorded only from Long Island, N. Y., and St. Paul, Minn. 



1213 ( — ). Arctocorixa vulgaris Hungerford, 1925a, 143. 



Dark brown; vertex and legs reddish-brown, front dull yellow; 

 pronotum with 9 — 11 narrow yellowish cross-lines; elytra with pale cross- 

 lines transverse and parallel, much less waved and broken than in any of 

 its allies, more broken and irregular on the membrane; ventrals dark, 

 those of male tinged with reddish. Frontal depression of male long and 

 deep, its sides not reaching eyes ; base of vertex one-fourth narrower 

 than base of eye. Pronotum and elytra rastrate. Length, 9- — 10 mm. 



Sudbury, Mass., May 3 (Frost). Ranges from there west to 

 Ohio and South Dakota. 



1214 (1444% ). Arctocorixa ornata Abbott, 1916, 341. 



Sides parallel. Tawny yellow with umber markings ; pronotum with 

 only four or five pale cross-lines; pale lines of elytra coalescent as in 

 pi. XII, fig. 4; membrane with a central dark stripe from which radiate 

 pale markings. Head wider than pronotum ; frontal impression of male, 

 elongate-ovate, large and conspicuous. Upper surface strongly rastrate. 

 Pala? as in pi. XII, fig. 10. Length, 9 mm. 



Recorded from New England and Ithaca, N. Y. 



1215 (1426^). Arctocorixa decorata Abbott, 1916, 341. 



Dull yellow with dark brown markings; pronotum with eight dark 

 cross-lines; cross-lines of clavus broad, somewhat forked, those of corium 

 tending to coalesce into indefinite longitudinal lineations ; membrane with 

 numerous vermiculate markings. Frontal depression of male small, shal- 

 low, barely exceeding the eye. Pala falcate; pegs 37, the apical 13 — 14 

 ones three times the length of the others. Length, 9 mm. 



Recorded only from Massachusetts. 



