MORSE: ORTHOPTERA OF NEW ENGLAND. 541 
Costa: an elevated, rounded ridge; the front edge of the wing or tegmen; 
the most anterior wing-vein. 
Cusp: a small pointed projection or process. 
Dedivent: sloping gradually downward. 
Deflexed: bent abruptly downward. 
Depressed: flattened dorso-ventrally (from above downward). 
Dichromatic: having two markedly different types of coloration. 
Dimorphic: having two forms markedly different in structure. 
Discal area, disk: the more central part of the wing. 
Disk of pronolum: the dorsal surface of the pronotum, above the lateral lobes. 
Distad, distal: toward the end farthest from the body, base, or point of 
attachment. 
Dorsal field of tegmina: that portion which lies horizontally on the dorsum or 
back of the insect. 
Dorsum: the entire upper part of the insect body, or body and head. 
Ecology: the science of the relation of organisms to their surroundings and to 
each other. 
Egg-guide: a pair of small chitinous processes between the upper and lower 
valves of the ovipositor in Locusts, = the third pair of gonapophyses, q. v. 
Emarginate: excised; notched. 
Entire: having the outUne even, smooth, not notched. 
Epicranium: the entire upper part of the head, including face, vertex, crown, 
occiput, and genae. 
Epimeron: the posterior of each pair of lateral sclerites of the meso- and meta- 
thorax. 
Episternum: the anterior of each pair of lateral sclerites of the meso- and 
metathorax. 
Equal: of the same size, dimensions, or extent; applied either to length, 
breadth, or termination. 
Excavate: hollowed out. 
Excised: notched deeply, as if having a piece cut out. 
Exserted: protruded; exposed to a considerable degree. 
Exiivia (-ae): the cast-off skin of an insect. 
Fasciate: banded or streaked transversely. 
Fastigium: the tip of the vertex. 
Femora, {sing, femur) : thighs, — the first long segment of the leg. 
Fossa (-ae): a groove or channel with sharp edges, — appUed particularly to 
those lodging the antennae. 
Foveola (-ae): a shallow depression, — appUed to concavities on the sides and 
top of the head of Locusts. 
Furcula: a forked process, sometimes reduced to a pair of tubercles, borne on 
the hind margin of the tenth dorsal segment of the male abdomen in some 
Locusts, 
Fuscous: brownish black of various degrees of intensity, usually dark. 
Fusiform: spindle-shaped; tapering with curved sides toward both ends. 
Galea: the outer apical lobe of the maxilla. 
Gena {-ae): the cheeks or sides of the head. 
