Uhler.] 432 [April 17, 



This species must not be confounded with the one which follows. 

 Dr. Harris has attached the same number to both, as if considering 

 them to be the same ; but the longer and narrower pronotum will at 

 once serve to distinguish the latter. The S. interstitialis inhabits the 

 far northern parts of British America; most parts of the region north 

 of the Ohio River on the west, and the Atlantic region on the east. 

 3. S. separata. 



Black, minutely, sparingly pubescent above; general form of S. 

 interstitialis Say. Head large, eyes brown, large and very prominent; 

 face minutely, densely punctured, clothed with erect hairs; cranium 

 wider than in the preceding species, having a small yellow spot each 

 side against the eyes, on a line with the amber-yellow ocelli; lower 

 margin of the clypeus recurved, the tylus and labrum bright yellow, 

 the rostrum, excepting its immediate base, piceous, extending a little 

 beyond the base of the posterior coxae. Antennas black, the basal 

 joint yellow, black underneath excepting the base and tip; the second 

 joint almost twice as long as the basal, third longer than the basal 

 and shorter than the fourth. The base of head longer than in the 

 preceding species. Bronotum obsoletely punctured, hardly polished, 

 clothed with erect pubescence; the sides oblique, slightly curved, 

 the callosities more polished, connate, forming a single transverse ele- 

 vation, with a rounded pit in the middle; behind it is an impressed, 

 punctured line. Bectus polished black, obsoletely wrinkled, sparingly 

 pubescent. Legs testaceous; the coxae more or less infuscated; ante- 

 rior femora black on the middle underneath, the intermediate and 

 posterior pairs with a black spot beneath near the tip, and clothed 

 with thick, whitish pubescence; tip of tibiae and also of tarsi blackish. 

 Hemelytra dull black, obsoletely rugulose, sparingly clothed with erect 

 pubescence, widest just behind the middle; the corium with a yellow 

 dot on the exterior margin near the tip, usually also with three or 

 four more minute ones on the middle suture and one at tip of clavus. 

 Membrane sometimes whitish, with a large black spot at the base in- 

 wardly, a small subquadrate one against the base exteriorly, and 

 behind this an orange spot which is bounded behind by another black 

 spot; the nervures blackish. Others have the membrane black, with 

 a yellow spot against the exterior margin and a few pale vestiges on 

 the middle. Venter, black, more or less tinged with piceous, pol- 

 ished, very remotely pubescent, minutely inconspicuously punctured, 

 tip of the genital segment broadly white. Length 4-4^ millims. Hu- 

 meral breadth, 1^ millims. Extreme width of hemelytra, 2 millims. 



