106 
shorter and somewhat wider, being about as long as broad. 
Legs short, middle and hind coxae equidistant, anterior coxae 
about half as far apart. First tarsal joint minute, but present; 
claws two, minute on posterior legs. Venter of abdomen marked 
with a row of indistinct transverse brown spots in the sutures, 
and often with longitudinal darker lines, a pair each side of the 
median line, and another line exterior to these. Spiracles dis¬ 
tinct, in minuteblackish rings. Anterior spiracle slightly elevat¬ 
ed. Anal plate ventral, not elevated, eighth dorsal "segment 
visible behind it from below; anal and genital apertures trans¬ 
verse, brownish. 
Length 1.8 mm., breadth .7 mm., antenna .12 mm. The young 
are broader, with proportionally longer legs. 
Described from six lots of specimens. 
The Chermesinse are doubtless the lowest plant lice, and most 
nearly related to the Coccidee. The affinities of Rhizobius seem 
to be in this direction, and it is also closely related to the other 
Rhizobiinse, most of which would probably prove to be Pem- 
phiginse if the winged forms were known. It would therefore seem 
a more natural arrangement to place the Rhizobiinse above in¬ 
stead of below the Chermesinse, as it now stands, bringing it 
n ?xt to the Pemphiginae. 
Although the species are generally credited with only one 
tarsal joint and one posterior claw, I am inclined to think 
that a minute first tarsal joint of the usual form is really pres¬ 
ent; and the claws of the posterior tarsus, although smaller 
than the others, seem to be both distinctly present in the species 
here described. 
No winged forms of Rhizobius have ever been reported, yet 
there is in our collections a singular pupa, evidently of this 
genus but of a different species, having well-developed wing-pads. 
Rhizobius panici , Thos., (Tychea panici) is closely related to 
this species, but differs distinctly in the antennae and beak. 
Rhizobius pose , Thos., appears to be a Dactylopius. 
The Sorghum Mealy Bug. 
(Dactylopius sorghiellus , Forbes.)* 
(Plate X., Fig. 7 and 8.) 
This mealy bug is an oval, distinctly segmented, reddish or 
flesh-colored insect, covered with a bluish waxy bloom, and com¬ 
monly bears a thicker mass of waxy substance imbedding the 
bases of a tuft of hairs at the tip of the abdomen. It is about 
.07 inch long, and about as thick as wide, its width between a 
third and a half of its length. It has a pair of short, eight- 
jointed antennae, and a black simple eye on each side of the head. 
It is of common occurrence on corn, generally infesting the 
roots, and usually found only where the corn has been planted 
* Coccus sorgMe’.lus, Forbos, Foaiteenth Rep. S.ate Ent. Ill. p. 7). 
