264 
Psyche 
[December 
abdomen. Every lobe (fig. 10) is furnished with an irregular 
series of long conical processes, evidently hollow and provided 
with a rather thick but elongate distal flagellum usually more 
or less curved. The flagella are very liable to be broken off, 
particularly from processes near the apices of the lobes; and 
many are missing in the nymph under study. In the pinned 
imago of Dysodius lunatus no trace of the flagella is discernible, 
but in alcohol specimens examined later they are as well-marked 
as in the nymph. In the nymph there is thus a striking simi- 
larity to Termitaphis in the essential features of the marginal 
lobes. The number and distribution of the lobes themselves, 
their division into lobules or processes, the presence on every 
lobule of an easily detachable solid appendage arising apparently 
at the base of the lobule and running through or beneath its 
axis to protrude beyond its apex — in all these particulars there 
is practical agreement between the two genera. These constitute 
a third group of facts which may reasonably be considered to 
support the hypothesis of relationship between the Termitaphi- 
didae and the Aradidie. The most striking superficial difference 
lies in the fact that the lobes in Dysodius are widely separated 
and thus fail to form such a continuous peripheral margin 
as in the Termitaphididce. In the Dysodius nymph the conical 
processes with flagella are present also on the margin and pro- 
jections of the head, and on the segments of the antennae. 
The metanotum is provided with two lateral lobes instead of 
one as in Termitaphis and allies. 
It seems probable that marginal laminae in Termitaradus 
constitute a defensive apparatus enabling the insect to withdraw 
all its appendages under cover. For such withdrawal the form 
and articulation of the peculiar antennae are especially adapted. 
Were the laminae closely appressed to the substratum there 
would remain no unprotected part of the whole periphery. A 
similar development of lateral laminae is frequent in myrme- 
cophiles and termitophiles, notably in the larva of Microdon and in 
certain beetles and Myriapoda. In the termitophilous milli- 
pedes of the genera Leuritus Chamberlin and Gasatomus Cham- 
berlin the general form of the body segments with their lateral 
lobes is strikingly reminiscent of the condition in Termitaradus 
