1. Alate (Alata). When the posterior tibia on each side is furnished with a dilated process which probably assists it in flight.—Ex. Petalopus phyllopus, &c. Plate [XV]. Fig. 2. a.
2. Foliaceous (Foliacea). When the tibia is laterally dilated into a thin plate for carrying pollen.—Ex. Euglossa cordata, &c.
3. Corbiculate (Corbiculata). When it is fringed with incurved hairs calculated for carrying kneaded pollen.—Ex. Apis, Bombus[1117].
4. Scopate (Scopata). When it is quite covered with a brush of hairs with which it brushes off the gross pollen, and in which it carries it.—Ex. Andrena[1118].
5. Calcarate (Calcarata). When it is armed with one or more spurs (Calcaria).—Ex. The majority of insects.
6. Excalcarate (Excalcarata). When it has no such spurs.—Ex. Apion.
I. Foot (Tarsus).
1. Scopulate (Scopulatus). When the first joint on the under side is covered with a dense brush of rigid hairs.—Ex. Apis, Andrena, &c.[1119]
b. metathorax.
1. Simulant (Simulans). When the mesothorax is covered by the prothorax, and the Metathorax only is visible, under the form of an elongated or enlarged scutellum.—Ex. The Geocorisæ. Plate [XXVIII]. Fig. 12.
α. postdorsolum.
1. Latent (Latens). When it is covered by the mesothorax; it is then usually a mere membrane.—Ex. Most Coleoptera.
2. Exposed (Apertus). When it is not so covered.—Ex. Atractocerus, Hymenoptera, &c.
β. postscutellum.
1. Distinct (Distinctum). When the postscutellum is distinct from the postdorsolum.—Ex. Locusta. Plate [VIII]. Fig. 12 u´.
2. Coalite (Coalitum). When it is not distinct.—Ex. Blatta.
3. Scutelliform (Scutelliforme). When it is a triangular elevated prominence resembling a scutellum.—Ex. Locusta.
4. Canaliform (Canaliforme). When it is a deepish elongate channel running from the postdorsolum to the abdomen.—Ex. Coleoptera. Plate [VIII]. Fig. 3. u´. XXVIII. Fig. 10. u´.
5. Obliterate (Obliteratum). When this channel is nearly or altogether obliterated.—Ex. Hymenoptera.
γ. postfrænum.