SUBFAMILY I. — PENTATOMIN^. 105 



I. Peribalus Mulsant & Rey, 1866, 262. 



Small oval, subclepressed species, having the head flat, as 

 broad across the eyes as long, rounded in front, its margins 

 feebly sinuate in front of eyes; pronotum with side margins 

 straight, not reflexed, humeral angles obtusely rounded ; scutel- 

 lum nearly equilateral, its apex rounded and, in our eastern 

 species, with a pale tip ; connexivum narrowly exposed ; osteolar 

 canal extended obliquely as a ridge along the front margin of 

 and to beyond the middle of its supporting plate ; genital plate 

 of male, semicircular, broadly emarginate at middle, its outer 

 apical angles usually ending in short oblong, bluntly rounded 

 lobes. Other characters as given in key. Five species have 

 been recorded from the United States, two of which occur in 

 our territory. 



KEY TO EASTERX SPECIES OF PERIBALUS. 



a. Under surface pale; connexivum with a narrow pale outer border; 

 tip of scutellum narrowly rounded; cheeks usually contiguous in 

 front of tylus. 63. limbolarius. 



aa. Under surface piceous; connexivum with black spots on the incisures 

 reaching nearly to the edge; scutellum wider, its tip broadly 

 rounded ; cheeks not contiguous in front of tylus. 64. piceus. 



63 (94). Peribalus limbolarius Stal, 1872, 34. 



Dull grayish yellow, thickly marked above 

 with fuscous punctures ; narrow edges of side 

 margins of pronotum, basal third of costal 

 margin of elytra, edge of connexivum and apex 

 of scutellum ivory-white, impunctate; mem- 

 brane of elytra fuscous; antennae with joints 

 1 — 3 reddish-yellow, outer two joints piceous; 

 under surface yellow with numerous fine re- 

 L motely placed darker punctures; legs yellow 

 > with small purplish dots. Form more depressed 

 and narrower behind than in piceus. Genital 

 plate of male strongly declivent, its ends deeply 

 and nari"owly cleft or notched to form two 

 nearly equal oblong lobes. Length, 7 — 8 mm.; 

 width, 4.3—4.8 mm. (Fig. 21). 



Frequent throughout Indiana, apparently more so in the 

 southern portion, Feb. 2 — Oct. 16 (W. S. B.). Sherborn, Mass., 

 Oct. 25 (Frost). Occurs in summer and autumn on flowers of 

 goldenrod and other Compositse, especially those growing in 

 alluvial soils or along the margins of ponds ; also on shepherd's 



