205 
hind coxae; rather large compound eyes. Proportions arid shape of 
young Phylloxera. 
“True female :—Legs short and the basal joint of tarsus rudimentary; 
antennae short, four-jointed, smooth, joints subequal, the third some¬ 
what longest. Mouth rudimentary. Described from skins surround¬ 
ing impregnated egg. Males unknown.” 
Pemphigus populi-monilis. Riley. 
* Winged female (Fig. 45, a):—Average expanse 6.5mm. Black, the 
abdomen a little lighter, especiall, at the tip. Finely powdered with 
white; broad across the shoulders, the scutellar lobes of the mesonotum 
being rather more flattened than the praeseutum; the head rather small 
Fiff. 45. 
and narrow. Antennae (Fig. 45, b) and legs rather short, the former 
reaching only to base of front wings; 6-jointed; joints 1, 2, 4 and 5 
subequal in length; 3 twice as long; 6 not quite as long as 3. Joints 
1 and 2 very stout; 3, 4 and 5 somewhat clavate; nearly smooth above, 
but with about twelve deep constrictions beneath. Legs normal, with 
basal joint of tarsus (Fig. 45, f) tolerably well separated, and unguis 
stout. Wings subhyaline; front wings with stigma strongly angulate, 
dusky, the lower portion almost black. Veins dusky, the costal and 
subcostal stout and darkest. Stigmal vein undulate, starting from a 
little beyond the middle of stigma. First and .second discoidals al¬ 
most connected at the base [in three specimens entirely so], and the 
distance between them at tips about one-third greater than between 
2d and 3d discoidals, and that between these two subequal vith that 
between the last mentioned and stigmal; the 3d discoidal obsolete 
toward base. Fold of hind border but moderately thick. Hind wings 
ample, the hook-angle but moderate, the subcostal slightly undulate 
