so INSECTA. 



with a strong lateral border, and in which the body is but slightly 

 convex above, compose the genus Eurynotus of Kirby *. 



Others, in Avhich the body is evidently more convex above, and the 

 thorax is transversal and but very slightly bordered, form the Iso- 

 CERUs, Meg. Dej. f 



In the males of the last of the Pedini, the three first joints of the 

 two anterior tarsi, always strongly dilated, diminish progressively 

 in breadth, and the fourth is very small. The posterior thighs of 

 the same individuals are concave and silky underneath 'I ; the body 

 is oval and the thorax slightly bordered, widening from before poste- 

 riorly or slightly narrowed behind, always terminated posteriorly 

 and insensibly by a prolonged and pointed angle. Such are the true 

 Pedini of Dejean or the Pedinus, Dej. § 



There, the anterior margin of the head is entire or vmemarginate 

 in several. The four anterior tarsi of the males are equally, or 

 almost equally dilated. The form of the body, and that of the tho- 

 rax in particular, is still similar to that of the last Pedini. 



Those, in Avhich the anterior margin of the head still presents an 

 emarginaticn, form the genus 



Blaptinus, Dej. \\ 



Those in which it is entire or unemarginate, the 

 Platyscelis, Lat. ^ 



We now come to Melasoma, provided with wings. Their body is 

 usually oval or oblong, depressed or but slightly elevated ; their 

 thorax square or trapezoidal, and its posterior extremity as wide as 

 the abdomen. The palpi are larger at the extremity; the last joint 

 of the maxillary palpi has the figure of a reversed triangle, or is secu- 

 rifoi-m; the mentum is but slightly extended in width *, and leaves 

 the base of the maxillae exposed. 



These Insects compose the third and last tribe of the Melasoma, 

 that of the Tenebrionites, formed of the single genus 



Tenebrio. 

 As originally arranged by Fabricius, and to which we will annex his 

 Opatrum and Orthocera; they will serve for types of as many parti- 

 cular divisions. 



* Eurijnotus muricahis, Kirb., Lin. Trans, XII, xxii, 1. See Platijnotus striatus, 

 Schoenh., Synon. Insect, I, 1, tab. ii, 6. 



t Catalogue, &c., Dej., p. 65. 



X The underpart of the same thighs is also silky in the male Heliophili. 



§ Catalogue, &c., Dej., p. 65. 



II Dej., Catalogue, &c., p. 66. — jBZaps^4V;!f?e;w, SchcEnh., Synon. Insect., I, i, tab. 

 ii, 8. 



^ Dej., Ibid. ; Fisch., Entomog. Russ., II, xx, 1 — 5. 



** The Epitragi, by their jaws, which are armed on the inner side with a tooth, 

 in a systematic arrangement, should be placed in this tribe ; they would be removed 

 from all the subgenera of which it is composed, by their much larger mentum that 

 covers the origin of the maxillae : but in a natural order, it appears to me they 

 should be placed near Helops. 



