572 PHILOSOPHY OF ZOOLOGY. 



dra, and Rhina, the antennae are distinctly geniculated. 

 The Brentusidae have antennae destitute of the knee, as 

 Brentus, Orchestes, Ilhamphus, Brachycerus, Cylas, Apo- 

 derus, Attelabus, and Apion. In another group, equally 

 numerous, the forehead is of the usual size. Among these, 

 there are some which have eleven joints in the antennae, 

 and the third joint of the tarsi bilobate. The antennae, in 

 some, terminate in a perfoliate club, as the Erotylusidae, 

 including Erotylus, Triplax, Lanugria, and Phalacrus. In 

 others, the antennae are filiform. In the Cerambicidae, the 

 labium is dilated and heart-shaped at the extremity, in- 

 cluding the genera Cerambix, Prionus, Callidium, Necyda- 

 lis, Saperda, Lamia, Stencorus, Leptura, together with 

 Spondylis and Parandra. In the Chrysomelinidae, the an- 

 tennae are shorter than in the preceding family, and the la- 

 bium is plain. It includes the following genera, Chrysome- 

 la, Cassida, Cryptocephalus, Clythra, Galeruca, Altica, 

 Hispa, Crioceris, Donacia, and Sagra. 



In those which have not eleven joints in the antennae, 

 and the third tarsal joints bilobate at the same time, there 

 are some which have the third tarsal joints entire. The 

 Mycetophagidae have eleven joints in the antennae, as My- 

 cetophagus, Uleiota, Cucujus, Agathidium, Zylophila, 

 Meryx, and Trogossita. In the Bostrichidae, the joints of 

 the antennae do not exceed ten, as Bostrichus, Cerylon, 

 Nemosoma, Cis, Cerapterus, and Pausus. The Scolytusi- 

 dae have the penultimate tarsal joint bilobate, as Scolytus 

 and Phloiotribus. 



IV. COLEOPTEIIA TRIMERA. The tarsi in this division 

 are all three-jointed. The antennae are clavate. In the 

 Coccinellidae, the antennae are shorter than the thorax, as 

 Coccinella and Chilocorus. In Endomychidae, the anten- 

 nae are longer than the thorax, as in Endomychus, Lyco- 

 perdina, Dascarus, and Eumorphus. 



