COLEOPTERA. 119 



In the fourth and last tribe, that of the Lepturet^, we find Lon- 

 gicornes in which the eyes are rounded, entire, or scarcely emargi- 

 nated, and Avhere, in this case, the antennae are inserted before, or at 

 most at the anterior extremity of this slight emargination. The head 

 is always inclined posteriorly behind the eyes in several, or abruptly 

 narrowed at its junction with the thorax, in the manner of a neck; 

 the thorax is conical or trapezoidal, and narrowed before. The elytra 

 become gradually narrower. 



This tribe forms the genus 



Leptura*, Lin., 



With the exception of certain species Avhich belong to the pre- 

 ceding tribes and to the Donaciae. Thus modified, this genus cor- 

 responds to the Slenocorus of Geoffroy, and the Rhagium and Lep- 

 tura of Fabricius. 



Sometimes the head is elongated posteriorly, immediately behind 

 the eyes. The antennae, frequently shorter than the body, are approx- 

 imated at base, and inserted beyond the eyes, on two little eminences 

 in the form of tubercles, and separated by an impressed line. The 

 thorax is generally tuberculous or spinous on the sides. 



Here, the palpi are filiform ; the last joint of the maxillaries is 

 almost cylindrical, and the same of the labials ovoid ; the third and 

 two following ones of the antennoe are dilated at their external angle, 

 and are curved and silky, particularly in the males. Such are those 

 M'hich constitute the 



Desmocerus, Dej. 



The thorax is in the form of a trapezium, without tubercles or 

 points on the sides; its posterior angles are extremely pointed. 

 The maxillae and labium appeared to me to resemble those of the 

 Lamiae, 



But a single species, well represented with all its details by 

 Knoch, is known. It inhabits North America f. 



There, the palpi are inflated at the extremity, and terminated by 

 a joint in the form of a reversed cone or triangle. The antennae are 

 regular, glabrous, or simply pubescent. 



Some are removed from the others, by the fact that their males 



* Or the Sfenocorus of the first edition of the R^gne Animal, a denomination 

 which I have thought it best to suppress, on account of the confusion resulting from 

 the different applications that have been made of it. 



N.B. Messrs. Lepeletier and Serville — Encyc. Method., X, 687 — have placed in 

 this tribe a genus established by tliem under the name of Euryptera, which should 

 be distinguished from all those of this division of the Longicornes, by the number of 

 joints in the antenna;, amounting to twelve instead of eleven. Its type is an Insect 

 of Brazil, which is unknown to us. 



t Sfenorot-us ajaneus, Fab.; Knoch, N. Beyt., I, p. 148, vi, i. ; Rhagium cyaneum, 

 Schoenherr, 



