256 THE CANAUIA.N K.NTt)M(>HKiIHT. 



slightly shorter than the segment. Tliird scgnient four to five limes as 

 long as the sixth and spur ; first segment gibbous on the inner side. Inner 

 side of antennal tubercles with slight projection. Forehead narrow, body 

 long, wings long, with cubitus twice forked. Nectaries short, slightly 

 longer than broad, and somerthat tapering, but constricted in the middle ; 

 ends oblique to the a.\es of the nectaries. Cauda longer than the nectaries 

 and knobbed at the tip ; base tapering and strongly constricted at junction 

 with the tip. Anal plate rounded and without an einargination. 

 Callipterus mucidus Kilch belongs in this genus. 



Myzocdilis Passeriui, i860.' 

 type, A. coryli Gcetze. 

 Synonyms: /'Urocailis I'asserini, i860.' 



Callipteroiiles Mordwilko, 1894.' 

 Tuberculatus Mordwilko, 1894.' 

 Suhcallipterus Mordwilko, 1894.* 

 ? Therioaphis Walker, 1870., 

 Discussion : This genus was first formed in i860 by Passerini, with 

 Aphis coryli GixM/c as the type. At the same time he formed the gehus 

 Ptetocal/is, with Aphis alrii Kabricius as the type, and included with it 

 Aphis tiiiie Linn. 



In 1906 Schouteden formed the genus Eucallipterits, with A. tilitr 

 Linn as the type. 



After studying s|)ecimens ot the above species I am of the opinion 

 that A. ahii Fab. is too closely related to Myzocal/is to form a new genus, 

 and so rterocallis is a synonym. The second species included by Pass., 

 under the genus name Pterocallis, is entirely distinct from the type, and 

 so the genus liuca/iipterus, as formed by Schouteden with A. tiliit Linn, 

 as the type, is valid. 



In looking over specimens which arc supposed to be Aphis ononoiiis 

 Kallenbach, I fail to see any characters distinct enough to separate this 

 species I'rom the genus Myzocallis, and so I have placed Therioaphis 

 Walker as a questionable synon) m of that genus. 



In 1894 Mordwilko used .'/. ^0/7// Gtetze as the type for his genus 

 Callipterotdes, but as this species was used for Afyxoai/lis it must go under 

 Myzocallis. In looking over specimens of Aphis quercus Kalt , I was 



I. (ili .AHJi, Parma, p. 28, i860. 



1. Ratx>li l,.ilM>r.itoiie ZooIoj;ischeskaK^o Kabincta Tm|)cralorskagfO : \'ar- 

 sliavska^o Univfi silela. 



3. The Zoolojjisi, p. 1999, 1H70. 



