30 INSECTA. 



abruptly narrowed or insinuate a little below the humeral angles, as 

 in the latter Insects. A more rigorous character, however, is, that 

 here the labial palpi are inserted in lateral fossulse of the anterior 

 face of the mentum, so that they are entirely exposed, and that the 

 sides of this mentum jut beyond them, even at their origin, and 

 protect them behind. In the two first divisions these palpi are in- 

 serted under the lateral margin of the mentum, or even in the 

 margin, so that when viewed from before, the ^first joints are not 

 perceptible. 



In the first — Trichides — the mentum is either isometrical, or longer 

 than wide, and leaves the maxillae exposed. It comprises the 



Trichius, Fab*. 



T.nohilis; Scarabcsus nobilis,^.; Oliv., Col., I, 6, iii, 10. 

 About an inch long; golden-green above; cupreous with yel- 

 lowish-grey hairs beneath. On umbelliferous plants. 



T. fasciatus ; Scarabceus fasciatus, L. ; Oliv., lb., ix, 84. 

 Rather smaller ; black, with scattered yellow hairs ; elytra yel- 

 low with three transverse, black bands, interrupted at the suture. 

 Very common in spring on flowers. 



T. eremita; Scarab, eremita,!/.; Oliv., lb., iii, 17- Large, 

 and of a brown-black; margin of the head turned up; three 

 sulci on the thorax.' — On the trunk of old trees, in the interior 

 of which resides the larva. 



The female of the T. hemipterus — Scarabceus hemipterus, L., 

 Oliv., lb., IX, 83, xi, 103 — and those of some other species of 

 North America are remarkable for the horny ovipositor at the 

 posterior extremity of their abdomen, by which they effect a 

 lodgment for their ova. 



These species are genei'ally found on the ground, where they 

 move very slowly. The last joint of their maxillary palpi is 

 proportionably shorter and thicker than that of other Trichii ; 

 the length of the first of the posterior tarsi also appears to me 

 to be considerably greater than the following one, while in the 

 other Trichii it is not so f . 

 The second division, Goliathides, is distinguished from the pre- 

 ceding by the mentum, which is much longer, wider, and covers the 

 maxilise. 



Here the mentum is concave in the middle, and in the form of a 

 widened heart or of a transversal square. The anterior extremity 

 of the epistoma is neither dentate nor coinute. The thorax has the 

 form of a heart, truncated at both ends and abruptly narrowed be- 

 hind, or that of a transverse square, roimded laterally. 



The first joint of the antennae is very large, triangular, or in the 

 form of a reversed cone. The palpi are short : the last joint of the 



* Messrs. Lepeletier and Serville, Encyc. Method., have established several new 

 divisions, some of which, it appears to us, should form separate subgenera, 

 -f- See Schoenherr, Syuon. Insect., I. iii, p. 99. 



