418 GEOLOGICAL SUEVEY OF THE TEEEITOEIES. 



transverse stripe ; lateral margins regularly curving toward the head. 

 Legs pale greenish, or with dark tips to the tibiae and tarsal joints. 

 Scutellum yellow in some specimens. Hemelytra with longer, erect 

 hairs about the base and costal margin ; the membrane brown, with the 

 costal nervule black. Tergum black, with the connesivum and apex of 

 the anal segment green ; venter yellowish, densely whitish sericeous ; 

 pubescent. 



Length to tip of venter, 3 millimeters ; width across the humeri, IJ 

 millimeters. 



Collected in Colorado. 



Plagiognathus, Fieber. 



P. ohscurus, new species. — Elongate aval, dull black or fuscous, clothed 

 with yellowish iDubescence. Head black, or blackish piceous, the occi- 

 pital ridge pale ; face moderately convex, obliquely inclining, smooth, 

 sparingly pubescent; tylus abruptly prominent, black ; cheeks black; 

 the gula black ; bucculse margined with yellow ; labrum and setae yellow; 

 the rostrum yellow or pale piceous, shining, reaching a little beyond the 

 posterior coxae ; the basal joint black, a little longer than the head ; an- 

 tennae black, or blackish fuscous, minutely hairy ; basal joint yellow at 

 tip ; the third and fourth joints paler than the others. Pronotum 

 broader than long, polished, obsoletely wrinkled, slightly more closely 

 pubescent in the males than in the females; humeral angles a little 

 prominent, subacute; posterior margin regularly bowed, the edge de- 

 liexed ; lateral margins oblique, hardly sinuated ; the sides steeply de- 

 clining, with the carinate edge blunt ; anterior submargiu collar-like, 

 sinuated in the middle ; the callosities very slightly elevated, broad and 

 long, coalescing inwardly. Pectus piceous or black, bald, shining; 

 edges of the anterior acetabulae aiid xyphus, meso-pleural piece, tegula, 

 and surface adjacent to the posterior acetabulae more or less yellow ; 

 legs, including the coxae, bright yellow, sometimes tinged with piceous; 

 the anterior and intermediate femora slightly sprinkled with brown near 

 the tip, and on the inner and outer surfaces with a few brown dots ; 

 knees with a black dot; tarsi more or less piceous at base and tip ; nails 

 black. Scutellum minutely obsoletely rugulose, black, shining, having 

 a yellow V, formed by the tip of the lateral margins. Hemelytra black 

 or f)iceous, closely coated with yellowish pubescence; corium at base, 

 with a pale yellowish, elongt'ited spot, which runs along the suture and 

 extends upon the clavus to behind the middle ; there is also a vestige 

 beyond the clavus, a small spot at the exterior tip and a large spot on 

 the cuneus touching its base ; membrane smoke-brown ; the basal edge, 

 nervures of the areole, and a paler spot on the middle also yellowiish. 

 Venter piceous, minutely pubescent; the superior genital appendages 

 of the male yellowish, and the lateral appendage blackish. The deeply 

 colored females usually have the venter black, more or less invaded by 

 yellow or whitish spots on the middle and sides. 



Length, 4 millimeters ; width across the humeri, 1^ millimeters. 



This is a very common species in many parts of the United States. 

 Specimens have passed through my hands which had been collected in 

 Maine, Massachusetts, New York, New Jersey, Pennsylvania, Illinois, 

 Michigan, &c. The present specimens were brought from Colorado. 

 In Maryland the individuals are frequently to be seen upon the flowers 

 of the ox-eye daisy. Upon being approached they suddenly run down 

 beneath the calyx of the flower. 



