116 THE ENTOMOLOGIST. 



physiognomies of great use in rapidly determining the various 

 species of these insects. 



In conclusion, I have to thank Messrs. Auld, Farn, and 

 Gardner for kindly assistance with specimens. 



Folkestone : February, 1900. 



ON THE MORPHOLOGY AND CLASSIFICATION OF THE 

 AUCHENORRHYNCHOUS HOMOPTERA. 



By Dr. H. J. Hansen.* 



Antenna. 



It is evident that in all the Auchenorrhynchous Homoptera, 

 the antennae are composed of a shaft (or peduncle) and a whip 

 (or flagellum). The peduncle always consists of two considerable 

 segments, of which the first at least is always destitute of sensory 

 organs ; the flagellum — its base included — is always much thinner 

 than the second segment of the peduncle, and usually consists of 

 several segments, but by amalgamation it sometimes appears to 

 consist of a thicker short basal part, with a long thin tapering 

 non-segmented apical bristle. There does not appear to be any 

 noteworthy distinction between the two sexes in the sensory 

 organs. 



- 1. Stridulantia. 



The antennae are set in pits between the eyes right under the 

 upper margin of the forehead (frons) ; they seem to be singularly 

 uniform in all the species. The segments of the peduncle are 

 simple; the first is more or less concealed, roofed over in the 

 antennal pit, and is, at least usually, the longest ; the second is 

 2vithout sensory organs, and is always considerably thicker than 

 the first segment of the flagellum. The flagellum is fairly long, 



* This very important work was published in Danish in 1890, in the 

 ' Entomologisk Tidskrift ' (xi. pp. 19-76, two plates), under the title of 

 " Gamle og nye Hovedmonienter til Cicadariernes Morphologi og Syste- 

 matik," but scarcely any notice having been taken of it, among English- 

 speaking rhynchotists at least, a free translation of the third, fourth, and 

 fifth parts is now offered to the 'Entomologist.' The learned author, whose 

 knowledge of English is almost as thorough as that of his native language, 

 has been so kind as to look over my manuscript. The original paper, to 

 which the interested reader is referred, was accompanied by two finely 

 executed plates, containing more than fifty figures, illustrating the antennae, 

 claws, &c., of a number of forms. The more original portion of the paper 

 which is now translated was preceded by a short personal introduction 

 (pp. 19-22), and an historical resume of the classification of the Auchenor- 

 rhynchous Homoptera (pp. 22-34). Dr. Hansen's new considerations are 

 drawn principally from the structure of the antennas and legs, and from the 

 position of the spiracles. The generic and specific nomenclatm-e used in 

 this translation is identical with that in the original work. — G. W. Kirkaldy. 



