112 THE UNIVERSITY SCIENCE BULLETIN. 
Gerris canaliculatus Say 1832. 
Say, Heter. N., p. 36, 1832; Comp. writing Le Conte, vol. I, p. 363. 
“Above brownish; beneath yellowish, with a pectoral groove extending ~ 
to the venter. 
“Inhabits Georgia. 
“Head dark brown, with a slivery line from the eye to the antenne; 
antenne honey-yellowish and feet of the same color, the tarsi dusky; 
thorax dull yellowish or dull fulvous, darker each side, with a dorsal dull 
fulvous line and lateral margin, beneath which is a double black line en- 
closing a silvery one; hemelytra brown with black nervures; tergum ful- — 
vous with a black lateral line and yellowish margin; terminal spines even ~ 
with the tip of the tail; beneath yellowish fulvous; pectus with an ob- 
vious groove, extending to the venter, and in which behind is a blackish © 
line. 
“Length less than two-fifths of an inch. 
“Differs from marginatus in having an obvious groove beneath ex- © 
tending to the venter. The whole inferior (surface) also is yellowish, — 
with the usual silvery reflection; the posterior depressed margin of the — 
thorax is not so wide as in that species, and has no raised line.” 
Localities: Rhode Island, New York, New Jersey, Massachusetts, Con- 
necticut, North Carolina, Georgia, Florida. 
Genus LIMNOPORUS Stal. 
Represented in this country by one species in the literature. The fol- 
lowing points characterize the genus: Body, long and narrow; abdomen, 
long. Antenne as long as half the body—the first segment shorter than — 
second and third together. Sixth abdominal segment of the male roundly — 
emarginate. 3 
Limnoporus rufoscutellatus Latr. 
Latreille, Genera, Crust. Ins., III, p. 134, 1807. 
“The following description from Lamark’s Hist. Nat. des Animaux 
sans vertebres: 
“Sufra fusco-nigricans, infra argenteo, sericea; thoracis parte postica, 
abdominisque lateribus pallido-rufescentibus.” 
This is a fairly large, slender, dull reddish bug, well marked from our 
other species. 
Localities: Quebec, Ontario, Maine, Massachusetts, New Hampshire, © 
Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Mary- — 
land, Michigan, Illinois, Wisconsin, Dakota, Colorado, Arizona and British 
Columbia. 
Genus TENAGOGONUS Stal. 
“Inner margin of the eyes accurately sinuate behind the middle. The ~ 
antenne are long and slender. The body is comparatively long and ~ 
slender. The pronotum glabrous shiny.” 
Tenagogonus hyalinus Fabr. 1808. 
Fabricuis, Syst. Rhyng., p. 258, 1803. 
The following description is copied from Champion, Biol. Centr. Am. | 
Heter. II, p. 153: ; 
“Winged form. Rather robust, the head and pronotum shining, black, — 
the head with two longitudinal lines, united posteriorly, and the sides — 
behind, ochraceous; the pronotum with the lateral and posterior margins — 
narrowly, two short lines on the anterior lobe, and a narrow median line © 
