66 MECOPTERA AND PLANIPENNIA 
as long as broad, legs pale yellow, the tarsi annulated 
with pale brown, claws and arolium brown. Thorax and 
abdomen unicolorous. 
Wings as in flaveola, the tips scarcely more obtuse, 
hyaline, nervature moderately open, pale yellow, excepted 
the crossveins in the forewing, which are more or less 
indicated with black. This character is often very indistinct 
in some individuals. In the hindwing the nervature is 
always pale. The ramus divisorius joins the cubitus near the 
tip of the cubitalcell. Gradate veins in the forewings dark, 
5 in the inner row, 8 in the outer one. 
Body 8—91 mm, forew. 12—14 mm., hindw. 10}—11} mm., ant. 13—16 mm. 
Abd. 5—5imm., gr. br. 4—5 mm, gr. br. 8} —4 mm, 
Habitat: West Java. 
I examined 5 specimens, all reared from the egg in 
Batavia, November 1907, by Edw. Jacobson, who describes 
the development of this species as follows: 
On October 7h there was found a group of 21 eggs 
on a bamboo fibre, which hanged off from a bamboo strig 
in a flowerpot. They have the usual long-stalked form, 
the eggs are yellowish brown, the stalks hyaline. The eggs 
were 1'/, mm. long and 0,3 mm. broad, the stalks 4 mm. 
long, 0,1 mm. broad, and broader at the foot. Next day 
three mites were found sucking out the eggs, what proves 
that the long stalk not always protect them for prey- 
insects. The joung larvae emerged still the same day. They 
first rested sitting on the egg-scale, with the tip of the 
abdomen attached to it and the head turned downwards 
along the stalk. Such a young larva is represented in 
fig. 20. It has a yellowish red colour and the dark spots of 
its body are brown. Interesting are the long antennae, 
which have the same length as the mandibles, the short 
dactyliform processes on each segment and the long 
cylindrical pygidium. The length was about 2 mm. As 
food they got Ephemeridae, which were attacked imme- 
diately and sucked out. Most larvae ran round in a great 
hurry and covered their body with pieces of egg-scales, fibres 
Notes from the Leyden Museum, Vol. XX XI. 
