Original description: Mecostethus
magister Rehn 1902
Proc. Acad. Nat. Sci. Philad. 54: 631.
Type, ♂. Japan. Dr.
H. C. Wood. This species appears to be closely related
to the North American M. lineatus (Scudder), but differs
in the greater size, the more sharply defined and constricted frontal
costa, the comparatively shorter wings, and in the carination of
the ventral surface of the subgenital plate. No relationship appears
to exist with the European Mecostethus grossus (Linn.). Head
moderately prominent, the frontal costa forming a very marked angle
at the junction with the fastigium; fastigium produced, the median
and lateral carinae well marked, and all terminating at the narrowly
truncate apex; frontal costa slightly expanding ventrad, sulcate
throughout, the margins slightly constricted at the ocellus; eyes
large, ovoid, moderately prominent; antennae depressed, very much
longer than head and pronotum. Pronotum rugulose; cephalic margin
truncate, caudal margin obtuse-angulate, lateral carinae apparent
only on the cephalic margin of the prozona, median carina well developed,
uniform, severed by the transverse sulcus which crosses slightly
caudal to the middle; lateral lobes with the ventro-cephalic angle
rounded, tegmina exceeding the caudal femora. Mesosternal lobes
separated by a space subquadrate in outline; metasternal lobes very
narrowly separated caudad. Subgenital plate strongly produced, the
caudal portion subhastate in outline, bearing a marked longitudinally
disposed carina on the ventral surface. Caudal femora slender, genicular
lobes rounded; tibiae almost equaling the femora in length, bearing
12-13 spines on the margins. Color (specimen from
spirits).- General tint dull grayish-brown, eyes, postocular streak
and lateral lobes of the pronotum reddish-brown. Ulnar area and
extremity of the tegmina blackish, this color also suffusing the
genicular region of the caudal femora and tibiae as well as the
distal extremities of the latter. Scapular area of the tegmina whitish. Measurements.
Length of head and body 28.5 ㎜; Length of pronotum 6.5 ㎜; Length
of tegmina 27 ㎜; Length of hind femora 19 ㎜.
|