GLOSSARY. 339 



Cupreous. Of a copper-color. 



Deciduous. Casting off the wings. 



Dentated. Furnished with teeth. 



Denticle. A small tooth. 



Depressed. Flattened down. 



Dilated. Widened, expanded. 



Discoidal. Pertaining to the disk or middle. 



Discoidal areolets. Spaces of the middle of a wing ; in the Libellulina 

 they are placed beyond the triangle. 



Disk. The middle surface. 



Divaricated. Spreading apart, as two gradually separating branches. 



Dolabriform. Shaped like a hatchet. 



Dorsum. The superior surface of the thorax or abdomen. 



Elliptical. Elongate-oval. 



Emarginate,.or Emarginated. Notched. 



Ensiform. Sword-shaped ; sharp on both edges, and tapering to a point. 



Epistoma. That part of the face between the front and labrum. 



Equal. Of the same size or length. 



Excision. A cut out of an edge, not always of the same shape. 



Facies. Aspect ; appearance. 



Falcate. Sickle-shaped ; curved like a sickle. 



Fascia. Used here as a stripe broader than a line. 



Femora. The thighs, 



Femur. A thigh. 



Fenestrated. Marked with transparent spots surrounded by a darker 

 color, somewhat like panes of glass in windows. 



Ferruginous. Rust-colored. 



Filiform. Slender and cylindrical, like a thread. 



Flavescent. Somewhat yellow. 



Flexuous. Almost zigzag, more acute at the angles than undulating. 



Foliaceous. Leaf-like. 



Forcipated. Furnished with two pieces approaching at the ends like 

 pincers. 



Fovea. A more or less rounded depression. 



Foveolate. Furnished with cavities or depressions. 



Free. Unrestrained in articulated movement ; not soldered at the points 

 of contact. ' 



Front. The fore-face, bounded by the eyes, the vertex, and usually be- 

 neath by the epistoma. 



Frontal. Pertaining to the front. 



Fuliginous. Of the color of dark smoke. 



Fulvo -aeneous. Brazen, with a tinge of brownish-yellow. 



Fulvous. Tawny, color of the common deer. 



Furcated. Forked ; split into two separating ends. 



Fuscescent. Measurably fuscous. 



Fusco -ferruginous. Rust-colored, with a brownish tinge. 



