58 THE UNIVERSITY SCIENCE BULLETIN. 
oo 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 are 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 coxe, slender, piceous, the basal joint 
yellow, with its apex black. Antenne 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. Coxze 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 tibiz 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 clavus 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 extericrly 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, 542-6 mm. 
Width of base of pronotum, 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. 
if 
Van Duzee adds Maine, New York, North Carolina, Minnesota and | 
Nebraska. 
