70 ElGHTEEXTH KePORT StATE ENTOMOLOGIST OF MiXXESOTA — 1920 



I Strongly object to the use of the ending -ina in a subtriljal sense. 

 The ending -ina may have the stamp of the l^itomological Code, but 

 it is ill-advised and contrary to good usage in nomenclature, as at- 

 tested by the best writers for a century or more. The term ending 

 -ina has always been used with the idea of something higher or supra, 

 and not as sub, following the spirit of the Latin language which is 

 the language of nomenclature. For subdivisions of the tribe with 

 ending -ini, the best writers of the past have used the ending -i or -ii. 

 Now to replace this by an arbitrarily chosen ending is contrarv to 

 good usage, which after all is a higher law that it is not well to 

 go contrary to. Mordwilko, therefore, in recognizing groups higher 

 than tribes, verv correctly used the ending -ina in accordance with good 

 usage. This was accepted by the author in a previous contribution in 

 an endeavor to establish this category in the family, as far as this can 

 be done in the present state of knowledge of the family. This may 

 be a minor question, but good authors of the past have always been 

 particular in this respect, guarding against corruption of g:ood usage 

 of the language. 



Tribe MYZINI Oestlund, 1919 



Passerini, 1800. Oli Alidi. Sub Myziis (genus) 



Oestlund, 1919. ITtli Kept. State Eutom. Miuii. Sub Myziiii (tribe) 



The present tribe was first indicated by the author. An elabora- 

 tion of the grounds that led to this step may therefore properly be 

 considered here. Passerini first foreshadowed the tribe in separating 

 ofi:' the genus Myzus. Much confusion exists as to the proper place of 

 the genus, and with the increase of genera has rather increased than 

 diminished. The genus Myzus has usually been associated with the 

 Macrosiphini with which it has much in coijimon. 



The presence of a peculiar type of sensilla on the antennae and 

 head, and usually on a large part of the body, present not only in the 

 adult form but also in the larval, is not only conspicuous but a char- 

 acter that must be accounted for phylogenetically and the taxonomic 

 value of these sensilla established. We may ignore them as we have 

 in the past and consider them as curious structures of little value, 

 l)Ut then we must show that they really are such. There are three 

 types of sensilla in the family Aphididae : first, the generalized hair- 

 like sensilla of the Lachnina and Chaitophorina ; second, the glandu- 

 lar or capitate sensilla so characteristic of the Callipterina and con- 

 tinued in the tribes Myzini and Macrosiphini ; third, the spine-like 



