58 EYES. 



The number is not, however, always the same in all 

 the species of a genus. Thus, Lipura maritima has 

 five ocelli on each side, while L. laricis, according to 

 Nicolet, has eight. Lastly, Bechia and Tritomurus have 

 no eyes. 



The antennae are situated on the upper surface of 

 the head in front of the eyes. They vary considerably, 

 and offer useful generic, as well as specific, characters. 

 We may consider the normal antenna as consisting of 

 four equal segments. They are generally situated on 

 a more or less salient tubercle, which, in some cases, 

 might be regarded as an additional segment. 



In Smynthurus (PI. LV, fig. l)the basal segment of the 

 antenna is short, the other three successively increasing 

 in length, each being nearly double as long as its prede- 

 cessor. The terminal segment is divided into more or 

 less numerous subsegments. In Painrius^ on the 

 contrary (PI. LV, fig. 5), the apical segment, though 

 similarly subdivided, is little longer than the basal. 

 In Dlcyrtoma the antennae are described as 8-jointed.-^ 



The genus OrcheseUa (PI. LV, fig. 9) has long, 

 6-joiuted antennse ; the basal and third segments are 

 short ; the second and fourth, always counting from 

 the base, are longer ; the two apical, again, about 

 equal to one another, and together almost as long as 

 the four basal segments. All the other genera of 

 PoDUKiD^E have the antennae 4-jointed. In Tomocerus 

 the two basal segments are short, the third is 

 elongated, in some cases very much so, and, as is also 

 the short terminal segment, is divided into a great 

 number of subsegments. T. longieornis often rolls up 

 its antennae spirally. It is remarkable that in full- 

 grown specimens of this species the terminal segment 

 is very generally wanting. M. Bourlet, indeed, 

 describes it as having only three segments to the 

 antennae, and though I have met with perfect speci- 

 mens, still, since this work has been in preparation, 

 though I have examined hundreds of specimens, 



1 Bourlet, ' Mem. Soc. Douai/ 1842, p. 56. 



