50 THE ENTOMOLOGIST. 
slightly swollen at their apices. Proboscis rather short and broad, 
not quite reaching to the second pair of legs, apex dark; penultimate 
segment broader than the apical, about the same length. Hyes 
large, black. Two incurved, slightly capitate hairs on the head in 
front. Legs green, the tarsi faintly dusky; hairs short and pale. 
Cauda green, more than half as long as the cornicles, prominent, 
finely spinose, and with three pairs of lateral hairs, and one median 
sub-apical one. Cornicles green, cylindrical, somewhat expanding 
basally, very faintly imbricated, about one-fifth the length of the 
body. Anal plate green. Skin slightly rugose. 
Length, 2 mm. 
The nymph is all bright green, except the tarsi and the fourth 
to sixth segments of the antenne, which are brown; the third 
segment is much longer than the fourth; the fourth a little longer 
than the fifth; the sixth much longer than four and five, its basal 
area about one-third the length of the flagellum. Proboscis not 
reaching the second pair of legs; dark at the tip. The frontal 
lobes not nearly as marked as in the apterous female. 
The larva is dull green; tarsi, apices of antenne, and cornicles 
dusky. Antennz shorter than the body; frontal tubercles not as 
large as in the adult; segments relatively shorter. Cauda triangular. 
Hyes black. 
Localities—Hurlstone Point, Porlock, Somerset, May 8th, 
1915, with Lasius niger (W. C. Crawley) ; Rossbeigh, Co. Kerry, 
June, 1902, in nest of Lasius niger (Donisthorpe). 
Notes.—Mr. Donisthorpe sent me a single, much damaged 
apterous viviparous female Macrosiphum from a nest of Lasius 
niger afew years ago, which I could not describe owing to the: 
damaged condition. Recently Mr. W. C. Crawley sent me a per- 
fect 2 , nymph, and mature larva, also found in the same ants’ nests. 
at Porlock. The marked single sensorium on the third segment 
of the antenne, the caudal structure, and the rugose skin place 
these together, the only difference being that Mr. Donisthorpe’s 
specimen had the proboscis reaching past the second coxe. 
I do not think that there can be any connection between these 
apterous viviparous females and the Macrosiphum formicarium 
I described from an alate viviparous female taken by Mr. 
Donisthorpe on Lundy Island in a nest of Lasius flavus on 
June 9th, 1913 (‘The Entomologists’ Record,’ vol. xxvii, 
No. 8, p. 55, ‘New Myrmecophilous Aphides’). Koch (‘ Die 
Pflanzenliuse Aphidien,’ p. 155, fig. 210, 1857) describes a sub- 
terranean Macrosiphum (Siphonophora subterranea) from the roots 
of Senecio jacobea, the apterous female—which is ‘‘ Ziegelroth, 
durchaus weiss gepudert,” a very distinct species not so far found 
in Britain or since the original record. 
Another Macrosiphum was sent me by Mr. Britten, taken 
in ants’ nests at Great Lalkeld, Penrith, Cumberland, too 
damaged to identify, but it is clearly distinct. 
It thus appears that this group of Aphides occurs under- 
