COLEOPTERA. 541 



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

 responds to the Stenocorus of Geoffroy and the Rhagium and Leptura 

 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 antennae are dilated at their external an- 

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

 those which 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(l). 



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 

 alone are furnished with wings. Their thorax is conical and smooth, 

 without spines or tubercles. They compose the genus 



Vesperus, Dej. Stenocorus, Fab. Oliv. 



Their head is large and placed on a kind of rotula. The antennae 

 are long and slightly serrated, with the first joint shorter than the 

 third. The last joint of the palpi is almost triangular. The eyes 

 are oval and slightly emarginated. The elytra of the females are 

 short, soft and gaping(2). 



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

 number of joints in the antennae, amounting to twelve instead of eleven. Its 

 type is an Insect of Brazil which is unknown to us. 



(1) Stenocorus cyaneus, Fab.; Knoch, N. Beyt., I, p. 148, vi, i; Rhagium cya- 

 neum, Schoenherr. 



(2) Stenocorus strepens, Oliv., Col., IV, 69, I, i, b; S. luridus, Ross., Faun. 

 Etrusc. Mant, II, App. p. 96, torn. IN, fig. 1. 



