58 THE UNIVERSITY SCIENCE BULLETIN. 



Pentacora ligata (Say) 1832. * 



Acanthia ligata Say, Heteropt. New Harmony, 34, No. 1. 



"Form the same as in the Pentacora signoretii, black, a little shining. 

 Head a little narrower, black, with a yellow arc on the arched base; the 

 margins of the orbits of the eyes, the cheeks, tylus, and collum of the 

 throat more or less yellowish; vertex with two impressed oblique lines 

 converging before the ocelli, a short, longitudinal one outside of each 

 ocellus, and a short, wide groove on the middle of the raised front; the 

 front generally bounded beneath by a transverse yellow band. Rostrum 

 reaching upon the intermediate coxae, slender, piceous, the basal joint 

 yellow, with its apex black. Antennae piceous or black, the basal joint 

 paler above, short and thick; the apical joint a little shorter than the 

 third, but very much longer than the basal one. Pronotum trans- 

 verse, moderately flat, with the anterior lobe, omitting the outer margin, 

 very prominently convex, indented, and bounded by an impressed line; 

 surface black, shining, exceedingly minutely punctate, very finely pubes- 

 cent; the lateral margins white, abruptly recurved along their whole 

 length, and a little concave; posterior margin deeply, concavely sinuated, 

 with a yellow spot each side, and a smaller one in the protracted, ob- 

 liquely truncated angles; the extreme outer angle with a short tubercular 

 ridge. Antepectus black, broadly margined all around with whitish, 

 minutely punctate and finely pubescent; remaining pectoral divisions dull 

 black, finely pubescent; margined behind and outside with white, and with 

 extero-posterior lobes also white. Coxae black, terminated and margined 

 with white; femora lineated, with black on the inside and outside, either 

 throughout or in part; the knees and lines upon the tibiae and their ends, 

 the basal joint of tarsi, and the ends of the second and third joints also 

 black; nails pale piceous. Scutellum black, very minutely punctate, finely 

 pubescent; a short, linear, yellow spot on the margin, at the outer end of 

 the transverse impression, and the acute tip with a more or less slender 

 spot each side. Corium black, finely, closely punctate and pubescent; the 

 costal margin, a longish double spot on the suture a little behind the 

 base, a similar but larger spot on the middle, a third, either double or 

 triple, near the apex, two or three smaller ones near and on the posterior 

 margin, and one near the inner angle of the clavas yellow; the base of the 

 costal margin is less expanded than in the preceding species; membrane 

 blackish, with a transverse series of oblong, pale spots behind the base; 

 the cuneus yellow, but black at base. Venter black, polished, very 

 minutely punctate, remotely, finely pubescent, the segments margined 

 behind and exteriorly with white. Male genital segment very closely 

 set with long bristles, with still longer, very slender, strongly curved 

 appendages, and with two short teeth on the middle superiorly. The 

 other attachments are not disclosed in my specimens. 



Length to tip of venter, 4-5 mm.; to tip of membrane, 5V2-6 mm. 

 Width of base of pi'onotum, 2-3 mm. 



"A sprightly species, which inhabits dark rocks in the beds of running 

 creeks and brooks in the metamorphic region of Maryland ; and of eastern 

 Massachusetts, near Waltham and West Cambridge, from May till Octo- 

 ber. It flies from rock to rock on such, as are not covered by the water, 

 and from its wariness and activity is quite difficult to capture. 



"Mr. Kennicott found specimens in Illinois; others have been sent to 

 me from Ottawa, Canada, by Mr. Billings. Mr. Scudder collected it near 

 Lake Winnipeg. Mr. Sanborn met with it on the Magalloway river in 

 Maine, and on a brook near Andover, Mass. The Abbe Provancher sent 

 me specimens from Port Neuf near Quebec, and Mr. Say's came from 

 Indiana." — Uhler. 



Van Duzee adds Maine, New York, North Carolina, Minnesota and 

 Nebraska. 



