CONTRIBUTION TO THE KNOWLEDGE OF THE 



GROUP APHIDINA. FAMILY APHIDIDAE 



(HOMOPTERA) 



By O. W. Oestlund 



In a previous contribution^ the tribes of the group Aphidina 

 were left rather bare with the intention of treating these im- 

 portant tribes in a later contribution in connection with the 

 genera and species found in Minnesota. The following contribu- 

 tion will be a partial fulfillment of these intentions but without 

 consideration of the genera and species. A number of side ques- 

 tions have repeatedy come up in connection with the more strictly 

 ta>:onomic work to which it appears timely to give some special 

 attention. They may not all be closely connected with the subject 

 in hand, but are digressive discourses on phylogenetic subjects 

 suggested by the main topic. To some they may appear critical ; 

 they have not been written with this intention, but rather to be 

 suggestive and helpful towards placing the taxonomy of the 

 family on strict phylogenetic foundations. The time is rapidly 

 passing when individual opinions will have much weight or value 

 unless they rest on broad phylogenetic principles. 



Group APHIDINA (Mordwilko) Oestlund, 1919 



Linnaeus. IToS. Syst. Nat. EiL X. Sub Aphis (genus) 



Burmeister. lS;i5. Handb. Ent<im. VoL 2. Sub Apliidina (family) 



Koch, 1854. Die Pflanzenl. Hft. 1. Sub Aphiden (tribe) 



Passerini, 1SG3. Aphid Ital. Sub Aphidinae (subfamily) 



Bucliton, 1876. Monogr. Vol. 1. Sub Aphidinae (tribe) 



Thomas, 1878. Bull. 2. 111. State Lab. Sub. Aphidini et Siphonophorini (tribes) 



Oestlund, 1887. Bull. 4, Geol. Surv. Sub Aphidini et Nectarophorini (tribes) 



Mordwillvo. liHis. Acad. Iniper. Vol. i:'.. Sub Aphidina (group) 



Wilson. 1910. Ann. P>nt. Soe. Am. Vol. 3. Sub Aphidini et Maorosiphiiii (tribes) 



Van der Goot, 1913. Tijdschr. Entom. Vol. 56. Sub Siphonophorina (tribe) 



Oestlund, 1919, 17th Kept. State Entom. Minn. Sub Aphidina (group) 



Baker, 1920. Bull. 826, U. S. Dept. Agr. Sub Aphidini (tribe) 



The bibliography above, tho incomplete, will suffice to show the 

 progress and trend of thought in establishing the higher cate- 

 gories for the family. Considerable confusion and differences of 

 opinion still exist in regard to the proper use of the categories. 



1 "Contribution to Knowledge of the Tribes and Higher Groups of the Family 

 Aphididae (Humoptera )" Seventeenth Report State Entonuilogist of .Minnesota. 1918, 

 pp. 46-72. 



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