Sept., rgog.l HaYHURST : TwO SpECIES OF HvALOPTERUS. 109 



of these plants in Germany towards the end of May and he noticed 

 the winged viviparie on the same hosts early in June. From these 

 observations Mordwilko (1907) assumes that the species is not yet 

 fixed in its migratory habits. This would not be at all surprising, 

 since there are other migrating species which infest the secondary host 

 much later in the season after the fall migrants have left for the pri- 

 mary host. The vivipara., e. g., of Aphis hakeri Cowen remained on 

 the secondary host, red clover, until after freezing last fall at Forest 

 Hills and the true sexes and a few hibernating eggs were found on 

 this plant late in October. I have also seen the adult ovipar^e of 

 Myzus persiccB Sulz. in October on radishes in Massachusetts. 



The following points in the life-cycle of this species remain to be 

 worked out. The migrations have never been actually demonstrated 

 by artificial transfers. Mordwilko has shown that individuals from 

 the columbines could be induced to live on the rose nine days in 

 September, but he does not state that oviparse or fertilized eggs were 

 thus produced. These females have never been described. The 

 species according to Walker may be injurious to columbine leaves, but 

 no one else seems to have noticed such injuries. 



This species is now known in the following countries : France, 

 England, Germany, Italy, Belgium, Russia and the United States. It 

 may be looked for anywhere in a temperate zone where the rose and 

 columbine grow. It is most probable that it has been distributed 

 over the world as hibernating eggs on the nursery stock of roses, which 

 are of course, imported during the dormant season. 



' Hxalopterus aquilegim-flavus (Kittel) was first described in the 

 Memoires Soc. Linn. Paris for 1826 under the name Aphis Aquilegice 

 nava in such language as to allow no doubt of its identity. Schoute- 

 den (1906) restores Kittel's name, but drops AquilegicE on the ground 

 that it is "inconvenient." I prefer, however, to retain the entire 

 name supplying a hyphen to make it binominal in effect. The Law- 

 of Priority does not permit the rejection of original names because of 

 inappropriateness and it gives no authority for rejection on account of 

 inconvenience. Hyphenated compounds are recognized as binominal 

 by the A. O. U. Code, Rev. Ed., 1908, p. xxxvi, and were used by 

 Riley Walsh and Osten-Sacken in describing gall insects. 



Hyalopterus dactylidis sp. nov., as already stated, is the yellow 

 aphid with blackish eyes which infests the blades of orchard grass. 

 The insects arrange themselves on the dorsal surface in the furrow of 



