Rostrate. Having a rostrum or snoutlike projection of 



the head bearing the mouth parts. 

 Rostrum. A snoutlike prolongation of the head bearing 



the mouth parts at the tip, or formed partly by the 



mouth parts. 

 Rufescent. Somewhat reddish. 

 Rufotestaceous. Reddish, yellowish brown. 

 Rufous. Pale red. 

 Ruga. A wrinkle. 

 Rugose. Wrinkled. 

 Rugulose. Minutely wrinkled; roughened but not 



rastrate. 



Saltatorial. Characterized by or adapted for leaping. 

 Scabrous. With a rough surface; irregularly and roughly 



wrinkled. 

 Sclerotized. Of the integument, hardened and usually 



darkened in definite areas by the deposition or 



formation of other substances than chitin in the 



cuticle. 

 Sculpturing. The markings or pattern of impression or 



elevation on an elytron or other body surface. 

 Scurfy. Having a scaly surface. 

 Scutellum. In Coleoptera and Hemiptera, the triangular 



piece between the bases of the elytra or hemelytra. 

 Scutum. Often the entire mesonotum anterior to the 



scutellum but sometimes restricted to only that part 



behind the transverse suture. 

 Sericeous. Silky; with short, thick, silky down giving 



a silky sheen. 

 Serrate. With notched edges like the teeth of a saw. 

 Sessile. Attached by the base or without any stemlike 



support or petiole; having the abdomen closely 



attached for nearly its full width to the thorax. 

 Setate. Having or bearing setae. 

 Setiferous. Setigerous, set with or bearing setae. 

 Setiform. Seta-shaped; hairlike. 

 Shagreened. Covered with a close-set roughness, like 



the rough-surfaced horse leather termed shagreen. 

 Sigmoid. Shaped like the letter S. 

 Sinuate. Distinctly wavy. 

 Spatulate. Having a broad rounded end and a narrow 



attenuate base. 

 Spinneret. A part of the apparatus by means of which 



silk is spun, usually a hollow bristle or spine. 

 Spinulose. Set with little spines. 

 Squama. Calypteres, q.v. 



Sternite. The ventral sclerotized part of a segment. 

 Stimuli. Small spines. 

 Stria. In general, any fine longitudinal impressed line; 



in Coleoptera, a longitudinal depressed line or 



furrow, frequently punctured, extending from the 



base to the apex of the elytra. 

 Striga. A narrow transverse line or slender streak, 



either on the surface or impressed. 

 Strigate. Having strigae; applied to a surface on which 



the strigae are impressed as in the elytra of some 



beetles or to an ornamentation composed of short 



fine lines. 

 Strigose. Rough with rigid bristles. 

 Striole. A rudimentary or poorly impressed stria. 

 Stylus. See forceps. 



487 

 Bentinck: Glossary 



Styliger plate. In mayflies, a broad, well-articulated 

 sclerite at the outer terminal angles of which arise 

 the clasping organs (forceps or styli) and thought to 

 be derived from the fusion of the coxites of the 

 primitive appendages of the ninth segment; also 

 called forceps base. 



Subanal lobes. In Plecoptera adults, a pair of plates 

 belonging to the eleventh segment, situated beneath 

 the anus and bearing the cerci. 



Subcallus. In Tabanidae, the large callus or swelling 

 on the face below the level of the lower inner angles 

 of the eyes and beneath the basal callus which lies 

 at or above the lower inner angles of the eyes. 



Subepaulet. In Tabanidae, a small scalelike sclerite 

 at the base of the costa. 



Subequal. Similar, but not equal in size, form, or other 

 characteristic. 



Subgenital plate. In Plecoptera females, the posterior 

 prolongation of the eighth abdominal sternite. 



Subrugose. Slightly or weakly wrinkled. 



Subulate. Awl-shaped; linear at the base, attenuate at 

 the tip. 



Sulcate. Deeply furrowed or grooved. 



Sulcation. A furrow or groove. 



Supra-anal process. In Plecoptera males, a median 

 process developed from the supra-anal lobe or 

 dorsal plate of the eleventh abdominal segment. 



Synthlipsis. See interocular space. 



Tails. A general term designating the long terminal 

 abdominal appendages of mayflies, comprised of 

 two lateral filaments (the cerci) which are always 

 present, and a median filament (the telofilum) which 

 may be well developed, vestigial or absent. 



Tail joinings. In Ephemeroptera, the weakly sclero- 

 tized or feebly pigmented intersegmental areas of 

 the tails. 



Tectiform. Rooflike; sloping from a median ridge. 



Tegula. A sclerite or lobelike structure at the base of 

 the fore wing, especially well developed in some 

 Hymenoptera and Lepidoptera. 



Teneral. The condition of the imago after emergence 

 from the pupa when its cuticle is not entirely 

 hardened or fully of the mature color. 



Terete. Cylindrical or nearly so. 



Termen. The outer margin of a wing, between the apex 

 and the hind or anal angle. 



Tibiotarsus. The terminal leg segment composed of 

 the fused tibia and tarsus, found in some insects. 



Titillator. In Plecoptera males, the median process 

 formed by the processes of the basal lobes. 



Tomentum. A form of pubescence composed of matted, 

 woolly hair. 



Tornus. In Lepidoptera, the junction of the termen and 

 inner margin of the wing; hind or anal angle of the 

 wing. 



Tracheal gills. Filiform or more or less lamellate 

 organs well supplied with tracheae and tracheoles 

 present in many aquatic larvae and some aquatic 

 pupae. 



Trochantin. In Coleoptera, a structure often present 

 on the outer side of, and sometimes movable on, the 



