1. Tabulate (Tabulatum). When it forms a broad pannel or table on each side the postscutellum.—Ex. Most Coleoptera.
2. Funiculate (Funiculatum). When it forms a narrow ridge.—Ex. Pentatoma, Fulgora, Libellulina. Plate [XXVIII]. Fig. 11, 12. v´.
3. Cruciate (Cruciatum). When there are two funicular ridges diverging on each side, which inclosing a pannel form together a St. Andrew's cross, and are connected with the base of the wings.—Ex. Libellulina[1120]. Plate [IX]. Fig. 7. v´.
4. Adnate (Adnatum). When a funicular Postfrænum is closely adjacent to the sides of the metathorax till it nearly reaches the wings.—Ex. Pentatoma.
5. Transcurrent (Transcurrens). When a postfrænum is at first adnate to the sides of the postscutellum, and then diverges across the pannel to the base of the wings.—Ex. Belostoma grandis.
IV. ABDOMEN.
1. Coalite (Coalitum). When the abdomen is not divided into segments.—Ex. Araneidea, Chelonus.
a. Plicate (Plicatum). When it consists of transverse folds.—Ex. Gonyleptes, Carkinodes[1121]. Plate [XV]. Fig. 11.
b. Tense (Tensum). When it is not folded.—Ex. Most Araneidea.
2. Insected (Sectum). When it is divided into segments.—Ex. Most insects.
3. Sessile (Sessile). When it has no footstalk, but is closely united to the trunk.—Ex. Coleoptera.
4. Petiolate (Petiolatum). When the first segment, or more, is longer and much narrower than the subsequent ones, so as to form a footstalk.—Ex. The Sphecidæ, Ichneumon.
5. Adjoined (Adjunctum). When it is connected with the trunk by a very short petiole.—Ex. Vespa, Apis.
6. Superimposited (Superimpositum). When the footstalk of the abdomen is inserted in the upper part of the postscutellum, so as to leave a considerable space between it and the postpectus.—Ex. Evania. Plate [IV]. Fig. 2.
7. Retracted (Retractum). When it is nearly withdrawn within the trunk.—Ex. Gonyleptes. Plate [XV]. Fig. 11. 8. Obumbrate (Obumbratum). When it is overshadowed by the trunk and concealed under it.—Ex. Carkinodes. Plate [XV]. Fig. 10.
9. Saltatorious (Saltatorium). When the ventral segments or the anus are furnished with elastic processes which enable the animal to leap.—Ex. Machilis, Podura. Plate [XV]. Fig. 14.
10. Natatorious (Natatorium). When the abdomen is terminated by flat foliaceous appendages, or the tail is ciliated on each side with dense parallel hairs, which assist the insect in swimming.—Ex. Larva of Agrion, and Dytiscus.
i. CAUDA.
1. Uncinate (Uncinata). When the tail is inflected so as to form a kind of hook.—Ex. Dolichopus ♂.
2. Aduncous (Adunca). When it is crooked.—Ex. Chelostoma maxillosa ♂. (Apis ** c. 2. γ. K.)
3. Distinct (Distincta). When it is distinct from the abdomen.—Ex. Scorpio.
4. Cheliferous (Chelifera). When it is terminated by a very thick forceps somewhat resembling a lobster's claw.—Ex. Panorpa ♂. Plate [XV]. Fig. 12.
5. Papilliferous (Papillifera). When at the last segment but one the tail exerts two soft fleshy organs, which secrete a milky fluid and yield a powerful scent.—Ex. Staphylinus.
ii. OVIPOSITOR.
1. Ensate (Ensatus). When it is long, compressed, and shaped like a sword.—Ex. Acrida.
2. Navicular (Navicularis). When it is shaped like a boat.—Ex. Cicada, Scaphura.
3. Telescopiform (Telescopiformis). When it consists of several tubes retractile within each other like the pieces of a telescope. Plate [XVI]. Fig. 2, 3.
4. Aculeiform (Aculeiformis). The ovipositors of Hymenopterous insects, which consist of the same parts, with the exception of the poison-bag (Ioterium), whether used as weapons or merely in oviposition.
a. Exerted (Exertus). When the vagina unemployed is partly out of the body.—Ex. Cleptes.
b. Extricated (Extricatus). When the valves and vagina unemployed are wholly out of the body.—Ex. Pimpla. Plate [XVI]. Fig. 1.
c. Reflexed (Reflexus). When the ovipositor is turned up and lies upon the back of the abdomen.—Ex. Leucospis.
APPENDIX.
Terms particularly applicable to Larvæ and Pupæ.
LARVÆ.