430 INSECTA. 



outer or terminal one coriaceous. The thorax is oblong, and the 

 posterior legs large(l). 



Amphicoma, Lat. 



Outer side of the mandibles rounded and arcuated, the inner not 

 dentated; antennal club globular; abdomen soft, and all the legs of 

 the ordinary size. 



The epistoma is strongly bordered. The anterior tibiae have three 

 teeth exteriorly. The four first joints of the tarsi are strongly cili- 

 ated in the males. 



In this and the following subgenus, the maxillae terminate in a 

 membranous, narrow, elongated, thong-like lobe. Their palpi are 

 hardly longer than the others, and the length of their last joint is 

 scarcely greater than that of the preceding one(2). 



In those, such as 



Anthipna, Escholtz, 



The antennal club is formed of free and oval leaflets. 



The epistoma is not bordered before; the median portion of the 

 head forms with it a plate of a long square figure, bordered laterally 

 and posteriorly. The outer side of the anterior tibiae has two teeth. 

 The four first joints of the tarsi are dilated and dentiform in the 

 males. These Insects otherwise resemble the Amphicomae(3). 



In the others, the labrum and mandibles are covered or non-salient, 

 and some at least of their tarsial hooks are bifid. The-mentum is 

 elongated and pilose. 



Sometimes there are two hooks to all the tarsi. The antennae 

 never have more than nine joints. The epistoma is usually trans- 

 versal. The palpi are but slightly elongated, and their last joint is 

 oval. 



Here, the posterior legs differ but little from the others. 



Chasmopterus, Dej. Melolontha, Illig. 



All the hooks of the tarsi bifid; terminal lobe of the maxillae nar- 

 row, elongated, with two remote teeth on the inner margin; the body 

 almost oval, thorax rounded and the elytra of equal width through- 

 out(4). 



(1) Lat., Gen. Crust, et Insect., II, p. 117. 



(2) See Lat, Gener. Crust, et Insect., II, p. 118; genus Jlmphicoma, first 

 division. 



(3) Jlmphicoma abdominalis, Lat., Gener. Crust, et Insect., II, p. 119; M. al- 

 pina, Oliv., Col., I, 5, x, 112. 



(4) See Catalogue, &c, Dej., p. 60. 



