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.” 
LChilowanthus stellata Curtis 1835. 
Acanthia stellata 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 zostere Fabricius, but it is very distinct from my examples of 
that insect. As some of its larve or pupe 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 coxe or little more. Antennz 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 narrowerthan 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. Ale 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 (Linnzus) 1758. 
Cimex littoralis Linneus, Fauna Suec., 246, No. 915; Sys. Nat., 481, No. 14. 
Salda 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, 
