MORSE: ORTHOPTERA OF NKW ENGLAND. 485 
u. Cerci of nearly equal breadth throuKhout, suljtrai)czoidal, dorsal 
margin concave, apical margin oblique, apex dorsal, rounded. 
Northern Locust, M. borealis, p. 506. 
gg. Cerci of irregular shape. 
j. Cerci expanded apically. 
k. Cerci roughly sock-shaped, the expansion chiefly dorsal to the 
axis. Hind femora robust, not fa.sciate. 
Two-strijxjd Locu.st, .1/. bivittalus, p. 514. 
kk. Cerci expanded on both sides of the axis, often nearly sj'mmetri- 
cal, the greatest width across expansion nearly equal to the total 
length. Hind femora slender, fasciate. 
Pine-tree Locust, M. punctidalns, p. 51L 
jj. Cerci forked, the dorsal branch much the broader. 
Broad-necked Locust, M. luridus p. 509. 
jjj. Cerci with apical half two-thirds as wide as quadrate basal half, 
diverging from it at an angle of 45° upward and inward, rounded 
and shallowly sulcate externally. 
Little Locust, M. confusus, p. 507. 
Fe.\IALE8.^ 
Tegmina no longer or but little longer than pronotum. 
m. Hind tibiae red. 
n. Tegmina broadly oval, shorter than pronotum. Lateral lobes of 
pronotum much longer than deep, the upper half strongly contrasted 
in color with the lower. Body not compressed. Hind margin of 
pronotum rounded, nearly truncate. Mid-carina of pronotum dis- 
tinct on metazone only. Metepisternum with pale streak. Hind 
femora usually not fasciate Smith's Locust, M. mancus, p. 518. 
nn. Tegmina lanceolate, acuminate, very acutely taper-pointed, longer 
than pronotum. Lateral lobes of pronotum about as deep a.s long, 
lateral stripe well developed on prozone, lacking on metazone. 
Body not compressed. Hind margin of pronotum a little extended, 
1 In using this table it should be distinctly understood that complete reliance 
cannot be placed on any single character, so great is the similarity between 
species and so wide the range of individual variation. In many cases all 
available characters need to be considered in order to determine with certainty 
the species to which a given specimen belongs. For these reasons, in order to 
facilitate identification, I have here summed up the more important characteris- 
tics of each species, instead of simply stating one or two as in ordinary cases. 
In addition to the points stated in the table, the measurements, date, and 
locality may be found helpful. From 90 to 95% of the specimens examined 
will be readily determined by this table, most of the remainder with a little 
trouble, and about 2 or 3% not until the student has become thoroughly 
familiar with all of the species here considered. M. bivittalus will be recognized 
at once by its size; M. punctulatus by the form of the ovipositor; and M. 
confusus, less readily, by the same means. 
19 
