Further Notes on Dyscritina 385 
No. 3. Body 4°5 mm. long. Cerci 10 mm., with 43 joints. 
Antenne with 8 joints on left and 9 on right side. 
No. 4. Body 65 mm. long. Cevci incomplete, apparently 
injured (within them the cerci of the next stage 
are plainly visible and it is noticeable that the 
joints of the two sets do not correspond). 
Antenne, left with 14, right with 12 joints. 
No. 5. Body 7°75 mm. long. Cerct 13°5 mm., with 45 
joints. 
No. 6. The penultimate stage—Body 9 mm. long. Cerer 
Imm. Antenne with 14 joints. 
The length of the adult insect varies from 11°50 to 16 
mm. of which the forceps occupy from 1 to 1°25 mm. 
In the larva of the new species there is a corresponding 
increase in the number of joints of the cerci during grewth ; 
though in this case it is more gradual and less noticeable 
as the total number of joints is much smalier, tke fully 
grown larva having only from 18 to 20 joints in these 
appendages. Their total length is only about three 
quarters that of the body of the insect. 
As stated above, in the penultimate stage the cerci are 
abruptly curtailed to a single jomt. These basal joints 
retain their previous character, and bear no resemblance 
to the forceps of the perfect insect. They are quite 
straight, with irregularly truncate extremities, looking as if 
the subsequent joints had been broken or bitten off. And 
I believe that such is really the case. No cast skin has 
been observed to accompany this change, and in one 
instance the insect lost the appendage on one side twenty-, 
four hours before the opposite one disappeared. The 
superfluous parts are probably eaten off by the insect 
itself. Upon examination of the abbreviated caudal 
appendages by transmitted light, the future forceps of the 
adult insect can be plainly seen within them (Fig. 11). 
From the above facts it would appear probable that the 
single jointed cercus (forceps) of the larval Porficulidx is 
not formed by a fusion of smaller joints, but corresponds 
with the long basal joints of the larval’ appendages of 
Dyscritina. 
Towards the end of the larval period the notal plates of 
the metathorax are distinctly sculptured with a radiating 
pattern, resembling in miniature a Forficulid wing 
(Figs. 2, 4). 
