HUNGERFORD: AQUATIC HEMIPTERA. 127 
Microvelia Marginata Uhl. 
Uhler, Proc. Zool. Soe. London, 1893, p. 719. 
“Dull black, nearly wedge-shaped, minutely pubescent, and obsoletely 
punctate, with the breast orange and the pronotum bordered with orange. 
Head rather blunt, convex between the eyes, a little compressed and pro- 
duced at the end of the clypeus, the underside pale testaceous. An- 
tennz stout, closely hairy, black; third and fourth joints longer than the 
others, the fourth longest, acutely tapering at tip; the basal joint thicker 
than the others, much longer than the second, pale beneath. Rostrum 
stout and swollen at base, reaching behind the anterior coxe, pale tes- 
taceous, piceous at tip. Pronotum broad, moderately convex, with the 
humeral angles bluntly rounded, and not prominent as in M. capitata, 
Guer. Pectus broadly yellow, dusky on the middle and posteriorly. Coxe 
and legs pale testaceous; the posterior legs dusky above, and fulvous on 
the middle of the tibiz. Scutellum dusky, mostly concealed by the pro- 
notum. Wingcovers black, bluntly rounded at tip. Abdomen black above, 
tinged with lead-color and a little sericeous beneath, the lateral margins 
broadly fulvous; the venter has sometimes a row of fulvous dots each side. 
“Length to tip of abdomen, 1%4 to 2 mm., to end of wing-covers, 214 
mm.; width of pronotum, *%4 mm. 
“Several specimens, both winged and unwinged, were collected by Mr. 
Smith in the pools of cool water at various localities on the island of 
St. Vincent.” 
Localities: New Jersey, Maryland, Florida and California. 
Genus MACROVELIA Uhler 1872. 
“General form of Microvelia, Westwood, but much more elongated. 
Head long and narrow, subconically narrowing toward the tip; the di- 
vision before the eyes several times longer than that behind them; 
eranium arched, curving downward; the tylus short, forming a narrow, 
blunt carina at the anterior extremity. Antennze slender, reaching be- 
yond the tip of the scutellum; the basal joint stoutest, narrowed at base, 
a little curved; second a little shorter, stout, enlarged toward the tip; 
third and fourth very slender, subequal in length to the basal one. Eyes 
round, placed on the sides a little below the upper line of vertex and 
near the occiput. Ocelli in contact with the inner margin of the eyes. 
Rostrum very slender, reaching beyond the anterior coxee; the basal joint 
very short, ring-like; the second joint very long, about three times as 
long as the apical one. Thorax subcylindrical, widened behind, bilobate 
by reason of a transverse constriction before the middle; the anterior 
lobe with a tumid callosity each side; collum distinctly defined; humeral 
angles knob-like, posterior margin of pronotum scutellum-like, the tip 
- bluntly rounded. Hemelytra narrower than the abdomen; the corium 
narrow, and with the membrane occupying also its inner margin. Legs 
long and slender.” 
Macrovelia hornu Uhler 1872. 
y Uhler, Hayden’s Surv. Terr. Rept. for 1871. 
“Fulvous, or reddish-brown, finely pubescent; the cranium bounded 
each side against the eyes by an impressed, oblique line, on the inner 
margin of which is a blunt, faintly elevated, oblique carina; the middle 
line slender, fuscous; cheeks and gular surface blackish; the space be- 
hind the eyes transversely tumid, the ridge joining inward to the slender 
carina, which runs along the whole length and forms a substitute for 
the buccale. Eyes dark brown. Antennz yellowish-testaceous; the ends 
of the joints darker, and the two apical joints a little infuscated. Pro- 
- notum bright fulvous, coarsely, remotely punctured with fuscous, each 
_ side of the middle of the anterior lobe and disk, with a feebly elevated, 
