hungerford: aquatic hemiptera. 59 



Genus CHILOXANTHUS Reuter 1895. 



"Body wide. Gula of head rather short. Eyes anteriorly less con- 

 vergent. Ocelli distinctly separated. Interocellar space about as wide as 

 the ocellus, or a little wider. Rostrum reaching to apex of intermediate 

 coxa or a trifle beyond. Pronotum toward apex slightly narrowed, be- 

 tween angles of the apical margins subequal in width to the head. Sides 

 flattened, lateral margins suddenly angulated before the apex, the callus 

 by no means touching the margin. A transverse impression placed behind 

 this, behind the middle of the disc; base of margin broadly emarginate. 

 Interior vein of corium of hemelytra furcate toward apex; branches at- 

 taining the suture of the membrane; internal area or first basis pro- 

 duced before the next area, never more than one-third, rarely only one- 

 quarter of its part; the apex by no means reaching the apex of the 

 second. Last ventral segment of female truncate. Type Acanthia pilosa." 



Chiloxanthus stellata Curtis 1835. 



Acanthia stellnta Curtis, Ross's Second Voyage to the Arctic Regions, 

 appendix Ixxv, Nov. 24. 



"Blackish sericeous; elytra with a pale spot at the center and several 

 at the apex; legs ocherous. Black, clothed with very short shining hairs; 

 thorax transverse, the edge beneath subocherous, as well as the center of 

 the antepectus; scutellum rather large; elytra with the costa reflexed at 

 base, a semitransparent spot at the base, another on the disk, and eight 

 or nine arranged in a circle on the submembranous apex; margins of ab- 

 dominal segments beneath ocherous, and forming a row of dots down each 

 side; legs dirty ocher, somewhat freckled with piceous. 



"Length three lines. 



"The head is wanting to the only specimen I have seen ; it most re- 

 sembles A zosterx Fabricius, but it is very distinct from my examples of 

 that insect. As some of its larvae or pupae were found, it is probably 

 not uncommon in the polar regions." — Uhler. 



Van Duzee specifies as localities: Arctic America; Pt. Barrow. 



Genus SALDA Fabricius 1803. 



"Body very broadly obovate or macropterous forms oblong ovate. Head 

 subvertical, partly deflexed below and converging a little anteriorly, gula 

 quite long. Ocelli subcontiguous. Rostrum reaching the middle of the 

 posterior coxse or little more. Antennas quite slender, shortly pubescent, 

 longer pilosity sparse. Second segment 2% or 3 times the length of the 

 first. Pronotum toward the apex quite strongly narrowed. Apical mar- 

 gin narrower than the head, sides straight or rotund. Callus quite large, 

 attaining behind almost a quarter of the basal part. Basal margin 

 broadly emarginate. Veins of the corium joined by an almost obsolete 

 slender litle vein, interior vein furcate toward apex, branches reaching 

 suture of membrane. Embolium entirely black. Membrane often ab- 

 breviated. Alae usually abbreviated or lacking. Third segment of pos- 

 terior tarsus subequal, length to second. Apex of last ventral segment of 

 female elongated and rotund. Type Acanthia littoralis (L)." 



Salda littoralis (Linnaeus) 1758. 



Clmex littoralis Linnjeus, Fauna Suec, 246, No. 915; Sys. Nat., 481, No. 14. 

 SoJda littoralis in Fieber, Europ. Hemipt., 147, No. 15. 



"Ovate, rather dull black, clothed above and beneath with closely 

 appressed yellow hairs, the head with a few distant, prominent, black 

 hairs. Head moderately long, the eyes very prominent, the face oblique, 

 carrying a few long, erect, black bristles ; base of the head constituting a 

 distinct neck, the throat concave ; tylus in the middle and the ends of the 

 cheeks generally yellow, but sometimes totally black; front moderately 

 flat, triangularly emarginate at the base of the tylus, the labrum broad, 



