1. Distant (Distantes). When remote at their base.—Ex. Buprestis rustica.
2. Approximate (Approximatæ). When they approach each other at their base.—Ex. Donacia, Galeruca.
3. Contiguous (Contiguæ). When they nearly or altogether touch each other at their base.—Ex. Imatidium MacLeayanum.
4. Connate (Connatæ). When united at their base.—Ex. Ceria. Plate [XII]. Fig. 13.
d. proportion.
1. Very short (Brevissimæ). When shorter than the head.—Ex. The Muscidæ, &c.
2. Short (Breves). When as long as the head.—Ex. Hister.
3. Shorter (Breviores). When longer than the head and shorter than the body.—Ex. Dytiscus.
4. Mediocral (Mediocres). When of the length of the body.—Ex. Callidium violaceum.
5. Longer (Longiores). When longer than the body.—Ex. Monochamus Sutor.
6. Very long (Longissimæ). When much longer than the body.—Ex. Acanthocinus ædilis.
e. direction.
1. Intire (Integræ). When they have no elbow or angle.—Ex. Antennæ of most Coleoptera.
2. Broken (Fractæ). When the Clavola forms an angle with the Scapus.—Ex. Curculio, Apis, &c. Plate [XXV]. Fig. 15.
3. Geniculate (Geniculatæ). When they form an elbow in the middle but not with the Scapus.—Ex. Meloe. Plate [XII]. Fig. 7.
4. Straight (Rectæ). When they are without any angle, convolution, or curvature. Plate [XI]. Fig. 5.
5. Porrect (Porrectæ). When they are placed parallel with each other, and in the same line with the body.—Ex. Trichoptera in flight.
6. Excurved (Excurvæ). When they curve outwards.
7. Incurved (Incurvæ). When they curve inwards.
8. Decurved (Decurvæ). When they curve downwards.
9. Recurved (Recurvæ). When they curve upwards.
10. Reflexed (Reflexæ). When they are bent back over the body.
11. Deflexed (Deflexæ). When they are bent downwards.
12. Convolute (Convolutæ). When they roll inwards. Plate [XII]. Fig. 6.
13. Revolute (Revolutæ). When they roll outwards.
14. Spiral (Spirales). When they are convoluted spirally. Plate [XXV]. Fig. 31.
15. Rigid (Rigidæ). When they are very stiff and inflexible.—Ex. Libellulina, Fulgora. Plate [XII]. Fig. 12, 15.
f. reposition.
1. Hidden (Receptæ). Antennæ which when the animal reposes, are hidden under the head or trunk.—Ex. The Lamellicorns, Elater, Belostoma.
2. Exposed (Apertæ). Antennæ which when the animal reposes are not concealed.—Ex. Cerambyx.
g. figure and size.
1. Setaceous (Setaceæ). Long flexile antennæ which taper somewhat from the base to the apex. Plate [XI]. Fig. 1.
2. Setiform (Setiformes). Short rigid antennæ which taper from the base to the apex like a bristle. Plate [XII]. Fig. 14-16.
3. Capillary (Capillares). Antennæ nearly as slender as a hair. Plate [XI] Fig. 2.
4. Filiform (Filiformes). Antennæ every where of an equal thickness. Plate [XI]. Fig. 3.
5. Thick (Crassæ). Antennæ disproportionably thick. Plate [XII]. Fig. 29.
6. Incrassate (Incrassatæ). Antennæ disproportionably thick in any part: at the base, middle, or apex. Plate [XXV]. Fig. 34, 19, 7.
a. Gradually Incrassate (Sensim Incrassatæ). When they grow gradually thicker from the base to the apex. Plate [XXV]. Fig. 10.
b. Suddenly Incrassate (Subito Incrassatæ). When they grow suddenly thicker in any part. Plate [XXV]. Fig. 18, 19, 24.
7. Broad (Latæ). Antennæ disproportionably wide. Plate [XXV]. Fig. 24.
8. Dilated (Dilatatæ). When they are disproportionably wide in any part; base, middle, or apex. Plate [XXV]. Fig. 12. Plate XII. Fig. 1, 20.
9. Slender (Tenues). When they are disproportionably slender. Plate [XI]. Fig. 2.
10. Attenuate (Attenuatæ). Antennæ disproportionably slender in any part; base, middle, or apex. Plate [XXV]. Fig. 8, 21, 34.
a. Gradually Attenuate (Sensim Attenuatæ). When they grow gradually more slender from the base to the apex. Plate [XI]. Fig. 7.
b. Suddenly Attenuate (Subito Attenuatæ). When they grow suddenly slender in any part. Plate XII. Fig. 1. Plate [XXV]. Fig. 18, 34.
11. Fusiform (Fusiformes). Antennæ thickest in the middle and tapering more or less towards each extremity. Plate [XI]. Fig. 5. Plate [XXV]. Fig. 8.
12. Prismatic (Prismaticales). Antennæ with three nearly equal sides. Plate [XI]. Fig. 6.
13. Ensiform (Ensiformes). Antennæ compressed and three-sided, with one side much narrower than either of the others. Plate [XI]. Fig. 7.
14. Falciform (Falciformes). When the Clavola of the Antennæ grows gradually narrower towards the apex, and is arcuate or incurved so as to resemble a sickle. Plate [XI]. Fig. 8.
15. Nodose (Nodosæ). When antennæ have one, two, or more joints larger than those which precede or follow them. Plate [XII]. Fig. 5.
16. Moniliform (Moniliformes). Antennæ consisting of oval or globular joints so as to resemble a necklace of beads. Plate [XI]. Fig. 9.
17. Dentate (Dentatæ). Toothed with teeth whose sides are equal. Plate [XI]. Fig. 10.
18. Serrate (Serratæ). Toothed with teeth whose sides are unequal like those of a saw. Plate [XI]. Fig. 11. Plate [XXV]. Fig. 8.
19. Biserrate (Biserratæ). So toothed on each side. Plate [XXV]. Fig. 18.
20. Imbricate (Imbricatæ). When the summit of each joint is incumbent upon the base of that which precedes it. Plate [XI]. Fig. 12.
21. Distichous (Distichæ). When the joints in general terminate in a fork. Plate [XI]. Fig. 13.
22. Cirrate (Cirratæ). When the joints terminate in a pair of curling hairy branches resembling tendrils. Plate [XXV]. Fig. 4.
23. Flabellate (Flabellatæ). When the antennæ on one side send forth from the joints, except those at the base, long flat flexile branches, which open and shut like the sticks of a fan. Plate [XI]. Fig. 17.
24. Biflabellate (Biflabellatæ). When they are flabellate on both sides. Plate [XXV]. Fig. 11.
25. Pectinate (Pectinatæ). Antennæ furnished on one side with a number of parallel stiff branches, resembling somewhat the teeth of a comb. Plate [XXV]. Fig. 25. Plate [XI]. Fig. 14.
26. Bipectinate (Bipectinatæ). Pectinate on both sides. Plate [XXV]. Fig. 22.
27. Duplicato-pectinate (Duplicato-pectinatæ). Bipectinate with the branches on each side alternately long and short. Plate [XI]. Fig. 15.
28. Ramose (Ramosæ). Antennæ furnished on one side with two or three irregular longish branches. Plate [XI]. Fig. 18.
29. Furcate (Furcatæ). Antennæ divided at the end into two prongs or branches. Plate [XI]. Fig. 19. Plate [V]. Fig. 3.
30. Bipartite (Bipartitæ). When they are divided to the base into two nearly equal branches. Plate [XXV]. Fig. 20.
31. Palmate (Palmatæ). Very short antennæ which send forth externally a few long finger-shaped branches, giving them some resemblance of a hand. Plate [XI]. Fig. 24.
32. Irregular (Irregulares). When the joints of the antennæ vary so much in size and shape that they cannot well be defined. Plate [XI]. Fig. 22.