HUNGERFORD: AQUATIC HEMIPTERA. . 127 



Microvelia Marginata Uhl. 



Uhler, Proc. Zofil. Soc. 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- 

 tennae 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 coxae, pale tes- 

 taceous, piceous at tip. Pronotum broad, moderately convex, with the 

 humeral angles bluntly rounded, and not prominent as in M cajntata, 

 Guer. Pectus broadly yellow, dusky on the middle and posteriorly. Coxae 

 and legs pale testaceous; the posterior legs dusky above, and fulvous on 

 the middle of the tibiae. 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% to 2 mm., to end of wing-covers, 2% 

 mm. ; width of pronotum, % 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; 

 cranium arched, curving downward; the tylus short, forming a narrow, 

 blunt carina at the anterior extremity. Antennae 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 coxae; 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 homii Uhler 1872. 



Uhler, Hayden's Siirv. 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 buccal*. Eyes dark brown, Antennse 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, 



