304 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



Quadrangle: A cell in the wing of Zygoptera bounded by Mt, Cu, 

 Arculus, and a cross-vein between M4 and Cui (similar in 

 position to the triangle in Anisoptera). 



R: Radius. 



Ri: First branch of radius. 



Radial sector: A branch of radius which crosses media; supposed to 



combine several branches of radius. 

 Radius: The third longitudinal vein of the wings. 

 Rugose: Wrinkled: with irregular, waved, elevated lines. 

 Rs: Radial sector. 



Sc: subcosta. 



Sclerite: A body plate. 



Serrate: Saw-toothed; the teeth set toward one end. 



Seta, -ae: A pointed movable bristle or stiff hair. 



Setiform: Resembling a seta. 



Setigerous: Bearing setae. 



Setose: Bearing setae. 



Sigmoid: S-shaped. 



Spatulate: Rounded and broad at top or end, attenuate at base. 



Spine: A heavy immovable bristle. 



Spinigerous: Provided with spines. 



Spinule: A small spine. 



Spinulose: Provided with small spines. 



Spiracle: A breathing pore or external opening of the air tube or 

 trachea. 



Spurious: False or accidental. 



Sternites: Sclerites of the sternum. 



Sternum, -a: Ventral plates of a body segment. 



Stigma: Same as pterostigma. 



Striated: Marked with parallel, fine impressed lines. 



Stylus, -i: A small rod-shaped projection at the tips of the lateral 

 gonapophysis of the ovipositor; in the male nymph, short 

 acute processes on ventral surface of segment 9. 



Sub: A prefix frequently meaning almost; used in such words as ■ 



subcircular; subtriangular. 

 Subcosta: The second longitudinal vein of the wing. 

 Subcostal cross-vein: A single cross-vein between subcosta and 

 radius next the body or proximad of all other antenodal 

 cross-veins; present in Progomphus (PI. x, Fig. i). 

 Submentum: The segment of the labium next the head. 

 Subtriangle: The cell in the wing behind the triangle. 

 Sulcate: Grooved or furrowed. 

 Superiors: Dorsal anal appendages. 



Supertriangle: The wing cell just in front of the triangle. 

 Supplementary radius and media: Extra longitudinal veins in the 



wings between M3 and M*, and M4 and Cui. 

 Supraepistemum: Same as anepisternum. 

 Suture: A depressed line between two sclerites. 



Tarsus, -i: The last two or three short segments of the leg of an 



insect, forming the foot. 

 Tenerals: Individuals not having their full coloration. 

 Terete: Cylindric or nearly so. 



Tergite: Applied to tergum when occupied by a single sclerite. 

 Tergum, -a: Dorsal surface of any body segment; refers mainly to 



abdominal segments here. 

 Tibia, -ae: The fifth segment of the leg or second long segment in 



dragonflies, bearing the tarsus at the distal end and attached 



to the femur at the proximal end. 



