8 
Psyche 
[ March 
small sclerite, the basipulvillus (bp) of Crampton, from 
which the retractile membrane leads to the under side of the 
claw. The relation of these membranes to the basipulvilli 
(where they are present) is the same throughout the or- 
ders and with further study should present interesting evi- 
dence with respect to the hypothesis that the pulvilli are 
evolved from such membranes. 
Mantidae — Tenodera sinensis Saussure. (Fig. 4) 
An arolium has not been found in Mantids thus far ob- 
served and such a structure is probably absent in this fam- 
ily. The general plan follows closely that of the roach al- 
though a seta is not present on the planta. The flexor mem- 
branes are large and especially noteworthy are their lat- 
eral expansions which if further produced might easily take 
on the appearance of pulvilli ! 
Order Isoptera 
Termopsis angusticollis Walker (Fig. 5) 
Again, in this case the basic plan follows closely that of 
the Blattid; however, the planta is much smaller than in 
either Mantid or Blattid and the seta does not arise from 
the planta itself but from the membrane. This condition 
might be taken as evidence for the view that the planta is 
a variable sclerotized area of the membrane between the 
claws. Although there is no arolium we find between the 
bases of the claws in winged termites a small plate (ar?) 
which undoubtedly represents an abortive arolium for in 
winged specimens of Mastotermes, a definite arolium, even 
though small and rudimentary, is present. Unguitractor 
and basipulvilli, as in the Mantid, show no significant var- 
iations from the Blattid type. 
The proximity of these three groups has been noted many 
times by students of insect morphology so that such a cor- 
relation in type of pretarsus is not surprising. This com- 
bination appears even more natural when contrasted with 
the equally coherent union (from the standpoint of Pre- 
tarsus) of the Saltatorial Orthoptera. 
