]54 



r. V. THEOBALD. 



flagellum ; segments 3-6 imbricated. Eyes dark, of moderate size. Proboscis 

 reaching to the second coxae. Cornicles cylindrical, longer than third antennal 

 segment, imbricated. Cauda blunt and rather short, not half the length of the 

 cornicles, spinose, with numerous pale hairs ; broader than cornicles ; the hairs curved 

 apically. Anal plate spinose, with long pale hairs. The rather thick set legs have 

 the coxae and trochanters darker than the rest of the legs ; a few short hairs on 

 the femora, many on the tibiae. Length, 2 to 2*5 mm. 



Food-plant : Umbellif erae. 



Peesia : Enzeli, Caspian Coast, 6.vi.l919 (P. A. Buxton). 



Types in the British Museum. 



Described from a single perfect alate female and several apterae. One of the latter 

 shows the cornicles not reaching the cauda, others passing it. It is a very marked 

 species, the black cornicles, cauda, etc., showing up prominently against the pale body. 

 The antennae are short, as in the genus Cavariella and the cauda is markedly spinose. 

 I can see no trace in the mounted apterae of any lateral pronotal or abdominal 

 papillae, as seen in the alate female. The larval stages are more uniform in colour, 

 but in succeeding instars the blackness of the cornicles, etc., gradually becomes more 

 pronounced. 



This species was found in association with an ant that has been identified by Mr. 

 W. C. Crawley as Lasius emarginatus, Latr., var. riigro-emarginatus, Forel. 



Myzus mespiiiella, sp. nov. (fig. 2). 



Apterous viviparous female. 



Green or yellowish green ; antennae of same colour as body, dusky at apex of 

 fifth segment, the sixth dusky, with a more or less darkened area at the junction of 

 basal portion and flagellum. Eyes deep reddish-black. Proboscis of same colour 

 as body, dark at apex. Legs same colour as body, apex of tibiae and tarsi dusky. 

 Cornicles and cauda of same colour as body ; in some the former seem a little darker. 

 Anal plate darker than cauda. 



Fig. 2. Myzus mespiiiella, sp. n. : A, B, apterous $ ; C, D, alate $. 



Antennae longer than body ; basal segment larger than second ; third segment 

 longer than fourth, but not quite so long as the sixth ; fourth a little longer than 

 fifth ; the sixth about as long as 4 + 5, with moderately long flagellum ; a few 

 short hairs on third and fourth. Proboscis rather long, reaching to or just beyond 

 the third coxae. Cornicles slightly longer than fourth antennal segment, cylindrical, 

 slightly broadening at the base, markedly imbricated. Cauda reaching not quite 

 to the level of the cornicles, less than half their length, narrowly triangulate or 

 pointed, spinose, with two pairs of lateral hairs. Anal plate spinose, with several 

 long hairs. Tibiae with numerous small hairs, becoming longer near apex. The 



