169 
full, but after a short time, when not supplied with food, becomes 
shrunken, and a distinct lateral ridge is found.” 
The specimens sent me, taken from the two plants mentioned, 
were mixed before the Professor’s letter was received, supposing them 
to be the same, which appears to be his opinion; but a full and care¬ 
ful examination has satisfied me that there are either two varieties or 
two species embraced. The one described is |uite smooth, without 
hairs or bristles, except the brush of hair at the end of the broad tail; 
what Prof. Burrill supposed to be tubercles, were not seen by me 
in the specimens received, but little bubbles, regularly spaced along 
the side and which apparently proceeded from the stomata, were seen 
in one specimen; none were observed along the back. Another speci¬ 
men was noticed, which had the antennae distinctly hairy, the tips 
of the outer joints having almost complete whirls of scattering hairs 
at the tips; this specimen also presented some other characters slight¬ 
ly differing from those described; and hence I have been led to the 
opinion the latter belong to different species. 
But the most important question connected with the history of these 
insects, at least most important to our agriculturalists, is this; are 
these wingless, root inhabiting insects, the ultimate and permanent 
form of the species? There are some reasons which induce me to be¬ 
lieve that they are dimorphic, and that this subterranean character is 
but one of the forms they assume, and is piobably a means provided 
by nature of passing through the winter or other portion of the year, 
during which the particular plants they inhabit furnish them no 
means of subsistence. 
One is, that very few of these subterranean species have been care¬ 
fully studied; but where this has been undertaken and carried out a 
large per cent, of these few have been traced to the winged form. 
Another evidently is that all these specimens have a larval appearance; 
the antennae are not fully developed; several of them showing beyond 
a doubt that the spur at the end of the fifth joint was growing into 
another joint of the form found only in those species with seven 
jointed antennae; and in these cases the third showed a constriction 
indicating a division into two joints, which is a very common method 
of development in this family. I am satisfied therefore that this spe¬ 
cies should be included under a genus with six or seven-jointed at- 
tennae. And although placed with those considered as permanently 
wingless, as indicated by the characters yet for reasons more fully 
set forth in the introductory part of this report, I am pretty well 
satisfied that it will ultimately be found that these are dimorphic 
forms of winged species. 
Tychea panici. Thos. 
(See figure 31, at end of report). 
Antennae very short, in the specimens examined, which appear to be 
scarcely full grown; not reaching beyond the prothorax, apparently 
five-jointed; joints nearly equal to each other, sub-moniliform. Body 
