GENERIC CLASSIFICATION OF APHIDIDAE. 27 



Genus CALLIPTERUS Koch. 



Plate IV, I, J. 



1855. Callipterus Koch, Die Pflanzenlaiise Aphiden, p. 208. 



1870. Callaphis Walker, The Zoologist, v. 5, p. 2000. 



1881. ,Ptychodes Buckton, Mon. British Aphids, v. 3, p. 39. 



1904. PanapMs Kirkaldy, The Entomologist, v. 37, p. 279. 



1917. Nippocallis Matsumura, Jour. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 365. 



In erecting the genus Callipterus, Koch included a number of species 

 among which was juglandis Kalt. In 1860, Passerini set juglandis 

 as the type of Callipterus and erected his Myzocallis for species similar 

 to coryli Goetz. 



Most writers overlooked Passerini's work and considered the genus 

 Callipterus in the light of Myzocallis. This is the conception com- 

 monly held by many to-day. The application of Callipterus, how- 

 ever, must be restricted to species essentially like juglandis. All the 

 other generic names listed as synonyms were, with one exception, 

 used with this same species juglandis as type and therefore require 

 little comment. 



The genus Nippocallis was erected with Icuricola Mats, as type. 

 Specimens of this species studied by the writer are not in good con- 

 dition for the observation of the anal plate. : All the characters 

 visible, however, indicate that this species is a Callipterus. 



Characters, — Cornicles present, truncate in form, rather prominent and often armed 

 with long hairs. Antennse of six segments, armed with stout hairs, sensoria usually 

 oval. Fore wings with the media twice branched, hind wings with both cubitus and 

 media present. Veins usually bordered. Radial sector often faintly indicated. 

 Cauda not distinctly knobbed in all cases. Anal plate bilobed; body usually covered 

 with prominent hairs. 



Forms living free upon the foliage. Sexual forms not differing markedly from the 

 other forms, oviparous female producing several eggs. 



Type (fixed by Passerini, 1860), Aphis juglandis Frisch. 



Genus CHROMAPHIS Walker. 



Plate IV, O, P. 

 1870. Chromaphis Walker, The Zoologist, v. 5, p. 2001. 



The genus Chromaphis was erected with juglandicola Kalt. as type. 

 It is related quite closely to Monellia. 



Characters.— Cornicles moderate in size, somewhat flanged. Antenna? of seven seg- 

 ments armed with oval sensoria. Fore wings with the media twice branched, hind 

 wings with media and cubitus present, wings not held horizontally in repose. Cauda 

 knobbed, anal plate slightly indented. Sexual forms somewhat similar to the vivip- 

 arous ones. Males usually winged. Oviparous female with the ovaries developed 

 normally, laying numerous eggs. 1 



Forms living free upon the foliage usually all summer; viviparous generations 

 winged. 



Type (monotypical), Aphis juglandicola Kalt. 



1 Davidson believes as many as 30 may be produced by one female. 



