APHIS VASTATOR. 



65 



Anterior tarsus - - r-^^Vi 



Posterior tibia 

 Abdominal spines 

 Length of rostrum 

 Antennae, 1st articulation 



2d 



3d " - 



4th 

 - 5th 



6th 



7th " - 

 In a winged specimen the wing measured about 







55 

 24 

 26 



4 



3 



20 

 164 

 14 



5 



19 

 128 



(258.) Considerable variation is observed in the total 

 length of the antennae in different specimens, the reason for 

 which I do not know. In all cases, however, they are 

 long in this species, and the relative length of the different 

 joints forms an important characteristic. 



The following measurements give the comparative 

 lengths of the articulations of the antennae in different 

 specimens of this insect: 



(259.) When the creature is at rest and feeding quietly, 

 the antennas lie reflexed over his back ; and this posture 

 is well shown in the diagram. (Plate vin., fig. 4.) 

 When, however, he is roving about, he carries them ex- 

 tended before him, apparently to feel or smell by their 

 assistance. 



