1920. | F. H. GRAvELY: Asiatic Palingenta. I4Ir 
she knows they do not occur on rivers actually rising in flat dis- 
tricts. The natives believe that until they have appeared there is 
always a chance of further floods and that consequently it is no use 
building the temporary bamboo bridges which they put up every 
cold weather until these ‘‘ pani-pooka’’ (water insects) have 
gone. The caudal appendages of the males were 3 inches long and 
semi-transparent when fresh. The insects are so light and hollow 
that they cannot be kept under water; when just out they are 
white or creamy and look like foam when blown together by the 
wind. All the specimens collected as adults were males; the 
females were caught as nymphs and hatched in captivity. 
This species is of about the same size as the last, but lacks its 
rich warm colour. The general colour of the male is whitish, with the 
upper surface of the head, mesothorax and posterior end of abdo- 
men tinged with dull brown ‘The margins of the fore-wings are 
natrowly tinged with the same colour. The second joint of the 
foretarsus is more distinctly longer than the first and third than in 
either of the two preceding species. The forceps seems normally 
to consist of the one long basal and two terminal joints character- 
istic of the subgenus ; but the second of the latter joints, which is 
fully as long as or even a little longer than the first, is often divided 
quite definitely into two near the base, at least on the outer side. 
The legs and caudal appendages of the female are smaller and 
feebler than those of the male, especially the caudal appendages, 
and the dorsal surface of the body is much darker in colour, being 
of a dull brown tint. ‘The wings are whitish as in the male. 
Larva (pl. xviii, figs. 5-8, pl xix, figs 9-16).—One male and 
two female cast skins, found floating in the surface water of the 
Dikko River, Nazira, Assam when adults were emerging, Oct. 
26-30, 1918; three males and one female insect from the same 
locality, Oct. 1919.! 
The total length (excluding the mandibles but including the 
caudal appendages) is 45-47 mm. in both sexes. The caudal 
appendages are 13 mm. long in the male and only g in the female, 
the body being therefore 4 mm. longer in the female than in the 
male. 
The teeth on the anterior margin of the head are somewhat 
more scattered than in P. longicauda. 
The mandibles (pl. xviii, fig. 7) are very hairy, long and slen- 
der and are upturned distally ; they have a number of small teeth, 
much smaller than those of P. /ongicauda, scattered along the basal 
2 of the upper margin. ‘They are intermediate in form between 
those of Palingenia (s. str.) longicauda (see Cornelius, 1848, fig. 3B) 
and those of Ephemera vulgata (see Eaton, 1883-8, pl. xxx, figs. 7-8). 
They are very different from the mandibles of the Palingenta 
(Anagenesia) larva from Ceylon’ figured by Eaton ees 8, pl. XXV_ 
Eire aeeeaons: is Seitea from the cast skins, as the larvae were not received 
till it had been completed. 
2 No adult from Ceylon was known to Eaton, Banks (1914, pp. 612-613), 
has since described Palingenta | Anagenesia) greeni trom there. 
