86 THE SCOTTISH NATURALIST 



The oviparous female, hitherto undescribed, is smaller 

 than the apterous viviparous female, measuring 1-4 mm. 

 long by 0-68 broad. (The viviparous female measures 

 2-1 mm. long by i-2 broad.) The antennae are also shorter, 

 and the division between the 3rd and 4th segment, which 

 is not quite complete in the apterous viviparous female 

 (but distinct in the alate viviparous female), is altogether 

 absent in the oviparous form, so that the antenna consists 

 of only five segments in the following proportions : — 8, 6, 

 28, 15 (11+24). The 3rd segment is faintly imbricated, 

 the 4th and 5th strongly so, the former with a single 

 subapical sensorium, and the latter with a sensorium at 

 the apex of. the basal portion. Total length of antenna 

 0-63 mm. Hind tibiae thickened and with numerous sensoria. 

 Cornicles and cauda shaped as in apterous viviparous female 

 but smaller. 



Genus Rhopalosip/mm, Koch, 



RJiopnlosiplmin eriopJiori^ Walker. — Very local but occur- 

 ring commonly on Cotton Grass {Eriophoriun angustifoliinri) 

 growing in boggy ground near Inveran, Invershin, on 

 20th September. The species had been breeding in numbers 

 between the sheathing leaves at the base of the plants, 

 close to the wet peat, and the stems and soil were covered 

 with their cast skins. Larvae and nymphae were now most 

 common, and many alatae (males and viviparous females) 

 occurred upon the leaves, but apterous viviparous females 

 were rare and no oviparous females were taken. The species 

 was only found in one small patch, other areas of cotton 

 grass appearing equally suitable being unattacked. The 

 leaves of the most heavily infested plants had turned red, 

 while those on which few or no aphides were present were 

 still green. Several specimens — nymphae and apterous and 

 alate viviparous females — were attacked by a fungus which 

 Miss E. M. Wakefield has kindly examined for me and 

 identified as Entoinoplithoi'a sp., probably E. aphidis, Hoff. 



Rhopalosiphum e7'iophori was described by Walker in 

 1848 {^Ann. and Mag. Nat. Hist. (2), vol. ii., p. 46) as Aphis 

 eriopJiori from the apterous viviparous female collected in 



