472 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
ment each other. It is of interest to note that three species in the 
eastern United States belonging to three different genera have 
adopted the same habitat — a rather pecuUar one, ledges and ex- 
posed rocky surfaces — and have taken on the same type of colora- 
tion. The third species is Trimerotropis saxatilis of the southern 
States. 
While relying largely upon its protective coloring to escape 
notice, it is nevertheless an alert and active species, springing 
suddenly into the air when disturbed and flying for several 
rods if alarmed. Adults appear in the latter half of July and may 
be found until late in October. It is known from Gloucester, 
Salem, the Middlesex Fells, Waltham, Sherborn, the Blue Hills, 
Mass., and Thompson, Greenwich, and New Haven, Ct. Extra- 
limitally it occurs in New Jersey and Maryland and a variety 
has been found as far south as Wytheville, Va. At Gloucester it 
lives on the same ledges with the Snapping Locust. 
Marbled Locust. 
Scirtetica marmorata (Harris). 
Plate 10, figs. 9, 10; Plate 21, fig. 20-22. 
Lociista marmorata Harris, Report, p. 145 (1841); Treatise, 3d ed., p. 179 
(1862). 
Oedipoda marmorata Smith, Rept. Ct. Bd. Agric. for 1872, p. 372 (1873). 
Dissosteira marmorata Fernald, Orth. N. E., p. 44 (1888). 
Scirtetica marmorata Morse, Psyche, vol. 7, p. 89 (1897). — Walden, Bull. 
Geol. Nat. Hist. Surv. Ct., no. 16, p. 101 (1911). 
Of medium size, a little compressed. Head medium. Eyes 
prominent. Antennae long, pale at base, infuscated at tip. 
Hind margin of pronotum obtuse or nearly rectangulate. Hind 
femora stout, cristate above and below. 
Ground color varying from pale ash-gray to a claret or even 
Indian-red, sometimes largely infuscated. Head; thorax, and 
tegmina heavily marked with blackish. Pronotum often with a 
black stripe beneath the lateral carinae, fading out posteriorly, 
and another narrow, irregular one midway between it and the 
ventral margin. Middle of metazonal disk and anterior margin 
dusky, giving a pale X-mark effect. Tegmina typically heavily 
