GENERIC CLASSIFICATION OF APHIDIDAE. 21 



Genus GLYPHINA Koch. 



Plate III, G-L 



1857. Glypldna Koch, Die Pflanzenlause Aphiden, p. 259. 

 1911. Travaresiella Del Guercio, Redia, v. 7, p. 299. 



Characters.— Cornicles present as somewhat elevated rings. Antennse 5-seg- 

 mented, minutely setose, armed with a few stout hairs and somewhat subcircular 

 sensoria. Fore wings with the media once branched; hind wings with only the media 

 present. Cauda not knobbed, somewhat rounded, anal plate rounded. Body covered 

 with hairs. 



Forms living upon the foliage of plants. 



Type fmonotypical), Glyphina betulae Kalt. 



Genus THELAXES "Westw. ' 



Plate III, A-F. 



Vacuna of authors, not Heyden. 



1840. Thelaxes Westw., Int. Mod. Class. Ins. Synopsis, v. 2, p. 118. 



In 1837, Heyden erected his genus Vacuna based on coccinea 

 Heyden. He definitely stated that he thought Phylloxera Boyer was 

 the same genus. Kaltenbach stated that coccinea is a Phylloxera 

 and so considered dryopMla as type of Vacuna, as this species was in- 

 cluded in the genus by Heyden. On the authority of Schouteden and 

 other European workers coccinea is now considered a Phylloxera and 

 another type, dryopMla, can not be set for the genus in order to apply 

 Vacuna to the genus as now understood. Vacuna with coccinea as 

 type will become a synonym of Phylloxera and another name will 

 be necessary to apply to the genus having dryopMla as type. The 

 next name used appears to be Thelaxes Westwood. 



Characters. — Cornicles present as chitinized rings on broad low cones. Antennae 

 of the stem mother 5-segmented. Alate form with 3-segmented antennae, sensoria oval 

 or subcircular. Fore wings with the media once branched, hind wings with the 

 cubitus lacking. Cauda distinctly knobbed, anal plate rounded. Sexual forms small 

 and apterous, possessing distinct beaks and feeding; oviparous female producing 

 normally but one egg. 

 Type (fixed by Westwood, 1840), Thelaxes quercicola Westw. (—Aph is dryophila Schr.) 



Tribe CALLIPTERIRL 



The tribe Callipterini is composed of forms which live upon the 

 foliage of plants. The species in many of the sub tribes have developed 

 peculiar habits. Some forms are almost solitary whereas others 

 live in colonies. Some have developed the power of leaping, 

 while others are sedentary. The sexual forms do not vary greatly 

 from the viviparous forms. In nearly all of the sub tribes the males are 

 winged, though in the Saltusaphidina they are apterous. In the other 

 tribes intermediate males may occur in the same species with alate 

 males. The oviparous females are nearly always apterous, although in 

 the Phyllaphidina alate ovipara may occur. Both sexes feed and the 

 ovaries of the oviparous female are developed so that several eggs are 

 laid. 



