352 THE ENTOMOLOGIST. 



least ten marked species are new. The latter will be described 

 later. They have nearly all been taken within a three-mile radius 

 of Wye. This makes one hundred and sixty-four species known 

 to the Kent fauna. A few localities outside Kent are also given. 

 The old descriptions in several cases are quite inadequate ; for 

 instance, the descriptions of Macrosiplmm {Siphonophora) jnsi of 

 Kaltenbach, Koch, Buckton, and others, applies equally well to 

 the green aphis on stitchwort {Stellaria), on meadow-sweet 

 (Spiraa), &c., but a microscopic examination shows them to be 

 distinct species. Species, especially in the genus Macrosiplium, 

 can only be identified from balsam preparations. The structure 

 of the antennae and the sculpturing of the cornicles, and to some 

 extent the female genital process, are the characters of most 

 specific value. The number and disposition of the " sensoria " 

 on the antenna in the alate forms is very marked in the different 

 species, as well as the form of the segments. 



In many cases I find it most difficult to place species in the 

 described genera, and several recorded here I have left in the 

 old genus Aphis pro tem. The present year has been one of 

 the most prolific we have seen for plant-lice for a long time, but 

 the prolonged drought destroyed so much of the vegetation they 

 were found on that in many cases no alate forms occurred. 



Genus Maceosiphum, Passerini (Siphonophora, Koch). 



Macrosiplmm {Siplwnopliora) gei, Koch.— Abundant in all stages 

 on Ge2tm urbanum, clustering on the flower-stalks, colonies often six 

 inches long. The alate forms readily fall if shaken. Wye, Faversham, 

 and Heme Bay, from the first week in May until August ; constant 

 winged broods appearing. Passerini places this as a synonym oipisi, 

 Kaltenbach ; it is quite distinct. I also found it in May at Ventnor, 

 Isle of Wight, and in Ecclesbourne Glen, Hastings. No trace after 

 August 10th. Schouteden considers this the same as ulmarice, Sch. 



M. (S.) stellarm, Schrank. — Abundant on the lesser stitchwort 

 {Stellaria graminca) in May. Like the former, readily falls if shaken. 

 Mostly large apterous females. Wye, May 27th, 1911, fairly common 

 in one locality ; also found abundantly on May 7th, in Ecclesbourne 

 Glen. Kaltenbach mentions Aphis pisi on this plant, evidently 

 mistaking it for his species described from peas, &c. 



M. (S.) ulmarice, Schrank. — On meadow-sweet [Spiraa ulmaria), 

 in dense colonies on the young shoots, and later under the flower- 

 heads. The adults readily fall if shaken. Alate and apterous forms 

 in June and July. Very common. Wye, 1911. 



ill. (S.) jacccB Linn. — On thistles. Wye Down, June 30th, July 

 11th, and October 10th, 1911, apterous females and larvcie in a dense 

 mass beneath blossoms and down the stalks ; on Centaurea nigra, 

 July 11th, August 19th, and October 15th, 1911, winged and wingless 

 females, and a few on Centaurea cyanus. 



M. scahiosce, Buckton. — On flower-stalks of wild and cultivated 

 scabious. Common around Wye, June 15th and July 11th, 1911; 

 also on Capsella bursa-pastoris seedheads, June 12th, 1911. 



