112 THE UNIVERSITY SCIENCE BULLETIN. 



Gerris canaliculatus Say 1832. 



Say, Heter. X.. 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 antennae; 

 antennje 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. Antennas as long as half the body — the first segment shorter than 

 second and third together. Sixth abdominal segment of the male roundly 

 emarginate. 



Limnoporus rufoscutellatus Latr. 



Lati-eille, Genera, Crust. Ins., Ill, 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 

 antennae are long and slender. The body is comparatively long and 

 slender. The pronotum glabrous shiny." 



Tenagogonus hyalinus Fabr. 1803. 



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 



