June, '11] DAVIS : Illinois aphidid.e 32a 



Eggs pale yellowish, covered somewhat with the waxy secretion but only acci- 

 dentally; deposited on the lower stems just beneath the surface of the ground. 



We have been taking this louse for the past three seasons about 

 Fort CoIHns and always on Syfnphoricarpos at or below the surface 

 of the ground throughout the year. It seems to be a bark feeder 

 exclusively. While this louse may not properly belong in the genus 

 Aphis, it fits here as well as in any genus known to me. 



Plate 9, Figs. 1 to 9, Aphis pulverulens; Figs. 10 to 16 Rhopalosiphum caprece. 

 1, Alate; 2, apterous viviparous females; 3, male; 4, antenna of Fig. 2; 5, antenna 

 of Fig. 1; 6, antenna of male; 7, antenna of oviparous female; 8, hind tibia of 

 oviparous female; 9, cornicle of alate female; 10, alate viviparous female; 11, end 

 of abdomen showing tubercle of the preceding; 12, the large tubercle or spine of 

 the apterous female; 13, apterous female; 14 and 1.5, cornicles of alate and apterous 

 females; 16, antenna of alate female. 



Figs. 1, 2 and 3 are enlarged 14 diameters; 4 to 9 enlarged 60 diameters; 10 

 and 13, 20 diameters; 11 and 12, 40 diameters; 14, 15 and 16, 80 diameters. Orig- 

 inal, Miss M. A. Palmer, Delineator. 



LIST OF THE APHIDIDAE OF ILLINOIS, WITH NOTES ON 

 SOME OF THE SPECIES. 



{Concluded from p. 496, Vol. S.) 

 By John J. Davis, Office of the State Entomologist, Urbana, Illinois. 



^Phorodon scrophularice Thos. : 8th Rep. State Ent. 111. (1880), p. 

 72. I have never seen this species, and it has only been recorded once 

 since the original description, W. T. Clarke having reported collecting 

 it in California on Scrophularia sp. ^ First reported by Thomas. 



*Phorodon galeopsidis Kalt. : What I consider this species and 

 have described below was found quite common on Polygonum pennsyl- 

 vanicum at Oak Park and Urbana from July to October. It doubtless 

 occurs at other seasons on the same plant, but it has never been 

 looked for other than in the months mentioned. It has not hereto- 

 fore been recorded from America, although I surmise that the species 

 referred to as Siphonophora polygoni by Thomas and Oestlund are 

 this species. It colonizes on the under surface of the leaves, prin- 

 cipally along the larger leaf veins. The oviparous female was not 

 taken. 



Winged viviparous female. — Head dusky (PI. 10, fig. 3), thoracic plate dark olive, 

 abdomen yellowish to yellowish green with a dark dusky green rectangular spot 

 on the dorsum, which sometimes is only present on the two segments anterior to 

 the cornicles, and a row of very faint dusky spots on each side of the abdomen. 



lA list of California Aphidida;. Can. Ent. Vol. XXXV (1903), p. 252. 



