1819.] 273 



proportions 5, 5, 28, 26, 20, 39 i^S-fSI). Primary sensoria on v nucl vi, 

 4-5 secondary sensoria on basal one- third of iii. Antennal tubercles very 

 moderate. Head brown, eyes ])ink. Rostrum reaches to the third pair of 

 coxae, greenish, dark at tip. Pro- and metatliorax rather darker than the 

 prevailing colour. Leys pale brown with coxae, tips of femora and of the 

 tibiae, tarsi and claws black. Lengths: femora of i 0"()4 mm., iii 08 mm.; 

 tibiae i 0*92 mm., iii 1-32 mm.; tarsi i 0"16 mm., iii 0'14 mm. Abdomen 

 domed, shining, olive-green, with black tufts arranged more or less regularly 

 in rows ; these in balsam preparatic^ns generally show a spine in the middle. 

 Semilunar black mark at base of each cornicle. Towards the margins a 

 slightly browner shade. Cornicles black, wider at the base than at tip, flanged, 

 re'iculated on apical half. "3 mm. long. Cauda coloured as in abdomen, 

 equal in length to the cornicles, 3-4: marginal hairs, 2-3 mediiui-apicallv% 

 Anal plate black. 



Total length 2"o mm. 



Apterous females only ; colour notes from living specimens. 



Shoeburyness, Essex, 31.viii.l919 {K. G. Blair) on Aster tri- 

 polium (nee A. trifolium of Wilson and Vickery's list). 



This species has not been recorded since Walker described it. 

 His material seems to have been lost, but his colour description agrees 

 with the species here redescribed. It is a typical Macrosiphoniella, 

 and is allied to both J/, artemisiae (Boyer) and M. millefolii (Fabr.j, 

 but readilj distinguishable from both. This brings the number of species 

 belonging to this genus up to twelve. Del Guercio (Kedia, vii, 1911, 

 pp. 331-333) includes Siphono2)hora lutea Buckt. in Macrosijphoniella, 

 but judging from the slide in the Buckton Collection the species should 

 be placed in Macrosiphum Pass. 



Aphis tripolii, sp. n. 



Apterous Viviparous Female. Ovate, vivid green, with irregular darker 

 green on abdomen. Antennae with segments i-iii very pale green, iv-vi darker 

 green, half the length of the insect, segments i and ii equal, iii a little shorter 

 than vi, iv a little longer than v, spur of vi twice the length of the base ; 

 proportions 3, 3, 10, 7, 6 (4+8), length -8 mm. Head green, eyes red, thoracic 

 segments green, strong lateral tubercle on prothorax. Rostrum reaching to 

 the third pair of coxae. Leys very pale yellow, distal end of tibiae black, tarsi 

 black. Lengths: femora of i -48 mm., iii 72 mm.; tibiae of i -80 mm., 

 iii 1-20 mm. ; tarsi of i '20 nun., of iii '20 mm. Abdomen with five marginal 

 papillae on segments 1-4, and 7. Cornicles dark brown, imbricated, slightly 

 longer than the cauda, 0-2 mm. long. Cauda dark brown, a little shorter than 

 the cornicles, four marginal hairs. 



Length 16 mm. 



Alate Viviparous Female. Head, thorax, black, abdomen green. Antennae 

 black, about two-thirds the length of the insect, segments i, ii equal, 

 iii considerably shorter than vi, iv and v equal, spur of vi more than twice 



