508 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
fig. 9 (1897).— Morse, Psyche, vol. 8, p. 293, pi. 7, figs. 42, 42a (1898). 
— Walden, Bull. Geol. Nat. Hist. Surv. Ct., no. 16, p. 119, fig. 45 (1911). 
This is a species of small or medium size and is rather short- 
bodied in appearance owing to the brevity of the tegmina and 
wings. Pronotum horizontal above, prozone full in female. 
Prosternal spine very variable, long or medium, cylindrical or 
conical, blunt, acute, or tapering, stout or rather slender, erect 
or inclined backward. Hind femora stout, plump. Subgenital 
plate short, its hind margin rounded and thickened, a little 
protuberant in the midhne. Cerci a little exceeding supra-anal 
plate, with broad, nearly equal base, suddenly narrowed on 
ventral side to two-thirds the basal width, the tip bent upward 
and inward, its dorsal margin flattened. Furcula spines of 
medium length, a little shorter or longer than last dorsal seg- 
ment, flattened or cyKndrical, parallel, well separated. Valves of 
ovipositor short, little exserted, the tips strongly recurved; 
the scoop of the upper valves very short, angulate at base. 
Color: olivaceous or rufous brown above, yellowish white or 
pale yellow beneath. The dorsal part of the head, pronotum and 
all femora is occasionally a bright lake red, sometimes pale 
tawny; the tegmina are almost invariably spotted with fuscous. 
Lateral stripe conspicuous on head, prozone, and side of body 
where it is cut by a distinct obhque white stripe. Hind femora 
obliquely fasciate on dorsal part of external and internal faces, 
and clear yellow to cherry red beneath. Hind tibiae very 
variable, ranging from rose red to sea green or pale blue, fre- 
quently being glaucous at base and rosy at tip. Red tibiae are 
more common among the females (25 to 33 per cent); in the 
males only 17 to 20 per cent are red. 
The female of this species resembles most that of M. luridus, 
from which it can readily be distinguished, however, by the short, 
angulated scoop of the upper valves of the ovipositor. 
Male 
Female . 
Measurements. 
Body 
Tegmina 
Hind femora 
Antenna 
15-18.5 
11 -15 
average 
12 -13 
10-11 
6.7-7.5 
19-24 
13.5-18 
12-13.5 
7 -8 n 
The body usually reaches about to the end of the hind femora; 
the tegmina are usually one or two millimeters shorter in the 
