66 FRED. V. THEOBALD. 



Apterous viviparous female. 



Antennae longer than body ; first to third segments pale, except apex of latter, 

 remainder dark ; first segment much larger than second ; third longer than fourth, 

 but shorter than sixth, with a group of 2-6 sensoria near the base ; fourth longer 

 than fifth, the latter with usual sub-apical sensorium, both combined a little shorter 

 than sixth to about the same length ; flagellum of sixth long ; hairs normal. Head 

 with well formed frontal lobes and with a small median prominence showing only 

 in some specimens ; other mounted specimens show the vertex almost flat. Eyes 

 large and dark. Proboscis reaching to or just beyond the second coxae ; apical 

 segment longer and considerably narrower than the penultimate. Cornicles dark, 

 cylindrical, somewhat expanding basally, reticulate at apex, remainder imbricated ; 

 shorter than third antennal segment. Cauda pale, about half as long as cornicles 

 and slightly thicker, with three hairs on each side and some apical ones ; not quite 

 reaching the apices of the cornicles. Legs relatively shorter and thicker than in 

 -alate female ; apices of femora and tibiae and tarsi darkened ; hairs moderate. 

 Anal plate dusky, with rather long hairs. Hairs of body slightly spatulate. 

 Length 2 '2-2 "5 mm. 



Ni/mpJi. 



Antennae longer than body ; darkened on fifth and sixth segments ; basal segment 

 larger than second ; third longer than fourth ; fourth longer than fifth ; the sixth 

 much longer than 4 +5 ; flagellum long, but relatively shorter than in mature forms ; 

 a few scattered hairs. Proboscis with dark apical segment, reaching to the third 

 coxae ; last two segments nearly equal. Wing pads dusky ; cornicles dark ; about 

 as long and as thick as third antennal segment, imbricated ; reaching past the 

 Cauda. Cauda triangulate, pale, with two pairs of lateral hairs. Legs with dusky 

 apices to tibiae, but not to femora ; latter with hairs on one side ; tibiae hairy. 

 Length 1'8 to 2 mm. 



Food-plant. Cissus sp. 



Transvaal : Pretoria 18.x. 1918. 



Described from three alate females and a number of apterous females and nymphae. 

 No colour notes were sent, but the species is so well marked that I have described 

 it. It comes nearest to Macrosiphum, but also approaches Myzus, especially in the 

 alate stage. Mounted apterae show the vertex in different forms, some have it 

 almost flat, others of typical Macrosiphum form, whilst others show a median 

 prominence. In the various larval instars the diflerences are great ; the first has 

 very short thick cornicles, in later stages they increase in length. The length of 

 the cornicles varies in the adults. 



The plant upon which these Aphids were found — Cissus — is one of the Order 

 Ampelideae. This genus is often merged into Vitis. None of the species recorded 

 from Vitis agrees with Mr. Fuller's specimens, and so far no Aphid has been 

 recorded from Cissus. 



The Aphids recorded from Vitis are Aphis illinoisensis, Shimer ; Aphis ripariae, 

 Oestlund ; Aphis vitis, Scopoli ; Macrosiphum viticola, Thomas ; Hyalopterus 

 arundinis, Fabricius ; Peritymbia vitisana, Westwood ; Rhizoctonus ampelinus, 

 Mokrzeki ; Schizoneura ampelorhiza, Del Guercio ; and three species of Phylloxera. 



