14 
Psyche 
[March 
unguitractor.” This condition is evidently the same as that 
here shown in Phyllophaga fused, (Fig. 16) in which the 
broken lines indicate the basal part referred to. It is 
questionable whether this is really within the unguitractor ; 
this portion of the empodium might be beneath the ungui- 
tractor, or, merely a degree of sclerotization. 
There is considerable similarity between the claw-seg- 
ments of Dermaptera and Coleoptera. Although the em- 
podium of Coleoptera is of course much more varied than 
that of Dermaptera, these orders agree in the absence of 
other significant structures. Some of the figures from 
Hayes and Kearns in which the empodium is absent are 
strongly reminiscent of the condition in Psalis, as in the 
latter, the area distad of the unguitractor is rather indefin- 
ite so that it is not difficult to imagine the sclerotization of 
this area to form the kind of empodium characteristic of 
Coleoptera — or its total lack of sclerotization with a result- 
ing absence of empodium which is also a condition commonly 
found in Coleoptera. This must remain pure speculation, 
however, until checked by further study. 
Order Neuroptera 
SiaMdae — Corydalis cornuta L. (Fig. 17) 
There is no arolium but the planta is large and the basi- 
pulvilli are contiguous with its lateral margins. The claws 
are simple and the unguitractor is triangular like that of 
Ithone. In general the pretarsus of Corydalis is surpris- 
ingly different from that of Mantispa, but except for the 
absence of arolium and basipulvilli setae, it is easily com- 
parable to the claw-segment of Ithone. 
Ithonidae — Ithone sp. (Fig. 18) 
The arolium is a median pad somewhat like that of P. 
americana, but much smaller and without the ventral con- 
cavity of the latter. The relations of planta and basipul- 
villi are of the Blattid type, but the planta is very lightly 
sclerotized and is continuous with the arolium, so that it 
might almost be considered as a part of this structure. The 
basipulvilli occupy the normal position and are provided 
with three setae, incidentally, the only case observed where 
