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SCUTELLIFORM. Shield-shaped. 



SCUTELLUM. The third section of the upper 

 surface of each segment in insects. 



SCUTUM. The second section of the upper 

 surface of each segment in insects. 



SEA-GREEN. The colour of sea water. 



SEA-SERPENT. A huge marine animal like 

 a serpent in form, and by some supposed 

 to inhabit the sea. 



SEALING. The operation of taking seals and 

 curing their skins. 



SEAM (of a shell). The line formed by the 

 union of the valves. 



SEBACEOUS. Consisting of or pertaining to 

 fat; as, the sebaceous humour, a suet- like 

 matter secreted by the sebaceous glands, 

 which are small glands seated in the cel- 

 lular membrane under the skin. 



SECONDARIES, or SECONDARY QUILLS. Those 

 quills which rise from the second bone of 

 the wings. The posterior wings of an in- 

 sect are denominated secondary if the su- 

 perior wings, when at rest are not placed 

 upon them. 



SECKETITIOUS. Separated by animal secre- 

 tion. 



SECRETORY. Performing the office of secre- 

 tion ; as secretory vessels. The organs of 

 secretion are of various form and structure, 

 but the most general are those called ylands. 

 Mucus, perspirable matter, &c. are pro- 

 perly secretions. 



SKCUHIFORM. When the last joint of the 

 feelers (palpi) are triangular, and the pre- 

 ceding joint is connected with the vertex 

 of the triangle. 



SEDENTARY. Accustomed to sit much ; ge- 

 nerally applied to persons whose employ- 

 ments render a sedentary life almost in- 

 dispensable ; for there are few, we believe, 

 who can prefer it to a life of healthful 

 activity. 



SEGMENTATION. The act of dividing into 

 segments. 



SEGMENTS. The parts into which the body 

 of an insect is divided, and which are thir- 

 teen. The great inosculating joints of the 

 body. 



SEGREGATED. Set apart, separated from 

 others. 



SEMI. In composition semi signifies half, or 

 imperfectly effected. Thus, semi-cordate, 

 half heart-shaped ; semi-crustaccoits, half 

 crustaceous ; semi-transparent, half or im- 

 perfectly transparent ; semi-cylindrical, 

 half cylindrical, or cut through length- 

 ways ; semi-lapidified, imperfectly shaped 

 into stone ; semi-osseous, half as hard as 

 bone ; semi-orbicular, of the shape of a 

 half globe ; semi-lunar, crescent-shaped, or 

 of the shape of a half moon; semi-pellucid, 

 Bomewhat pellucid or shining ; semi-vitri- 

 fied, partially converted into glass, &c. 



SEMINAL. Pertaining to seed, or to the ele- 

 ments of production. 



SEMIPALMATE. SEMI-PALMATED. A term 

 denoting that the toes are connected by a 

 web extending only half their length. 



SEMIRECONDITE. When the head of an in- 

 sect is half covered by the shield of the 

 thorax. 



SENILE. Pertaining to old age. 



SENOCULAR. Having six eyes. 



SENSATION. The perception of external ob- 

 jects by means of the senses. 



SENSIHILITY. The capacity of feeling or 

 perceiving the impressions of external ob- 

 jects. 



SENTIENT. Having the faculty of percep- 

 tion. 



SEPTIC. Proceeding from or generated by 

 putrefaction. 



SEPTIFORM (CantJius). When the canthua 

 forms an elevated ridpre or septum. 



SERICEOUS. Silky ; having a soft smooth sur- 

 face resembling silk. 



SERICTERIA. The glands which secrete the 

 silk in the silkworm. 



SERIAL. Pertaining to, or arranged accord- 

 ing to a series. 



SERIES. An order or subdivision of some 

 class of natural bodies. 



SERPENTINE. Winding ; spiral ; like a ser- 

 pent ; running in a serpentine direction. 



SERRATE. SERRATED. Toothed or notched 

 with points like a saw. 



SERRATURE. An indenture in the edge of 

 any thing, like those of a saw. 



SERRICATED. Covered with a short, thick, 

 and silky down. 



SERRULATE. Having very minute teeth or 

 notches. 



SESQUIALTEROUS (fascia). When both wings 

 of an insect are traversed by a continued 

 band, and either the primary or secondary 

 by another. 



SESSILE. Attached to any substance by a 

 base without a stalk or peduncle. When 

 the head of an insect does not move in the 

 socket of the trunk, but is attached to it 

 by a kind of ligament. 



SETACEOUS. Bristly ; set with bristles. 



SET.E. Bristles, or parts resembling bristles. 



SETIKEROUS. Producing bristles. 



SETIFORM (antennae). Short and rigid, taper- 

 ing from the base to the apex like a bristle. 



SETIGEROUS. Bristly. When antennae ter- 

 minate in a bristle. 



SETOSE. Covered with bristles ; furnished 

 throughout with irregular, harsh bristly 

 hair. 



SETULOSE. Setose with the bristles trun- 

 cated. 



SEXUAL. Denoting what is peculiar to the 

 distinction and office of male and female. 



SHAGREEN. A kind of grained leather pre- 

 pared from the skin of a fish, a species of 

 Squalus. 



SHEATH-WINGED. Having cases for covering 

 the wings ; as, a sheath-winged insect. 



SHELL. The crustaceous or testaceous cover- 

 ing of certain animals : as, the shell of a 

 tortoise ; the shell of a lobster ; the shell 

 of an oyster, &c. 



SHELL-FISH. An aquatic animal whose ex- 

 ternal covering consists of a shell, crusta- 

 ceous or testaceous ; as, lobsters, crabs, 

 oysters, &c. 



SHINING. Reflecting the light, but not in- 

 tensely. 



SIBILANT. Making a hissing sound. 



SICCATIVE. That which promotes the pro- 

 cess of drying. 



SILICIOUS. Partaking of the nature and 

 qualities ofsilex, one of the primitive earths 

 usually found in the state of stone. 



