June, '09] ENTOMOLOGICAL NEWS. 285 



Mr. Monell also sent measurements of four antennae from 

 spring migrants taken at St. L,ouis, Missouri, Ma} 7 10, 1907, 

 which are as follows : 



JOINTS OF ANTENNAE IN MILLIMETERS. 

 THREE. FOUR. FIVE. SIX. SEVEN. 



399 -214 -185 - IJ 4 -385 



399 -214 -185 .114 .371 



385 -185 .171 .099 .357 



.399 .199 .185 .099 .342 



These notes upon the same species, from a distant point 

 having a very different climate, are of special interest and tend 

 to confirm the conclusions I had drawn in regard to the life 

 habits of this louse, namely, that Viburnum is the over winter 

 host plant, that the immediate young of the stem-mothers all 

 acquire wings and leave the snowball bushes for other host 

 plants, that the bushes are free from this louse from some time 

 in June to September ist, and that the alate males and vivi- 

 parous females return to the snowballs in the months of Sep- 

 tember and October, the latter to deposit oviparous females, 

 and the former to fertilize them. 



The alternate food plant or plants I have not been able to 

 find. 



The most unique thing about this species is the presence of 

 sensoria on the hind tibiae of the viviparous spring migrants ; 

 and it is quite usual, at least, for the second generation all to 

 acquire wings in Aphis species. 



EXPLANATION OF PLATE XI. 



Aphis viburnicola n. sp. i, young stem-mother a few hours after hatch- 

 ing ; 2, old adult stem-mother with powdery secretion removed ; 2, an- 

 tennae of adult stem-mother ; 3, spring migrant ; $11, antenna ; $b, corni- 

 cle, and 3<-, hind tibia of spring migrant, greatly enlarged ; 4, fall migrant, 

 female, and 40, her antenna ; 5, fall migrant, male, and 5^, antenna of 

 the same ; 6, adult oviparous female ; 6a, young oviparous female ; 6f>, 

 antenna ; 6r, hind femur, and 6d, egg of adult oviparous female ; 7, twig 

 showing oviparous females and their eggs. Figures 2, 3, 4, 5, 6, da and 

 6^/are enlarged 15 diameters ; figure i, 45 diameters ; figures 2a, $a, 36, 

 3t, 4, 5, 6b and 6c, 60 diameters ; and figure 7, 5 diameters. Drawings 

 by M. A. Palmer. 



NOTE. Tlie drawings in Plate VIII (March Number) of this volume 

 were by Miss M. A. Palmer. 



