THE NEGRO BUGS. 67 



on the leaves of semiaquatic plants along the margins of ponds. 

 The known range of the species is a wide one, extending from 

 Massachusetts west to Nebraska and south to Florida, Texas 

 and Mexico. It is apparently more common in the south, the 

 northern records mostly reporting it as rather scarce. Uhler 

 (1876, 271) says "it abounds on the prairies of Illinois," while 

 Malloch (1919, 213) reports it as widely distributed, but not 

 abundant in that State. Parshley records it from but four sta- 

 tions in New England. Stoner (1920, 28) says it is nowhere 

 common in Iowa. The C. gilletti Van D. (1904, 8) is a synonym. 

 From our other species with white markings on sides of elytra 

 it is easily distinguished by its much larger size. These mark- 

 ings, however, vary to some extent, being often interrupted at 

 middle and sometimes present only near apex, but never 

 widened at base or crossing the subcostal nervure onto the 

 corium as in pulicaria. 



30 ( — ). Corimel^ena marginella Dallas, 1851, 59. 



Very small, broadly oval, convex. Black, shining, often with a 

 slight brassy lustre, the costal border of elytra with an entire calloused 

 yellow, orange-red or ivory-white line which is not widened at base; 

 margins of sixth ventral and, in females, of genital plate, orange-red; 

 antennae dull yellow, the terminal joints usually darker; femora black, 

 tibiae piceous, tarsi paler. Head broader across the eyes than long; 

 tylus slightly longer than cheeks, its tip yellowish, feebly thickened and 

 upturned to resemble a small tubercle; cheeks slightly sinuate in front of 

 eyes, rather coarsely and very densely punctate; beak reaching base of 

 second ventral. Pronotum finely and densely striate-punctate, the basal 

 portion elevated above the plane of the scutellum and more shallowly, 

 less roughly punctate; humeri subtuberculate, almost smooth at apex. 

 Scutellum with disk very finely, sparsely and vaguely punctate, the sides 

 more coarsely, deeply and densely so. Corium very small and narrow, 

 acute at apex, with a few minute punctures. Abdomen with sides finely 

 and closely punctate, the middle almost smooth. Length, 2.2 — 2.7 mm. ; 

 width, 1.3 — 1.7 mm. 



Perry County, Ind., May 16 (W.S.B.). Lakehurst, N. J., 

 May 29 (Davis). Lakeland, Dunedin, Sarasota, Ft. Myers, R. 

 P. Park and Key West, Fla., Nov. 21-May 7. The single Indiana 

 specimen was taken while sweeping herbage along the banks of 

 the Ohio River and well represents the character of the Aus- 

 troriparian fauna which extends northward into southern In- 

 diana. In Florida this is by far the most common and widely 

 distributed member of the familv and has been recorded from 



