46 MECOPTERA AND PLANIPENNIA 
off, one from Sumatra, collected by Ludeking, the other from 
Manna, West Sumatra, collected by the late controller 
M. Knappert (coll. v. d. Weele). 
Myrmeleon acer niasicus, nov. subsp. 
Most resembling sumatrensis, but with more acute wings 
and of about the same size as javanensis. The median 
markings of the vertex are also connected and very broad 
in their anterior end. The lateral ones are relatively some- 
what broader but of the same form as in sumatrensis. 
Body 23 mm., forew. 25 mm., hindw. 23} mm., ant. 41 mm. 
Abd. 17 mm., gr. br. 6 mm., gr. br. 5 mm. 
Habitat: Nias. 
One female from Lahago, Nias, from the collection 
Neervoort van de Poll (coll. v. d. Weele) and a female 
received from the controller KE. B. W.G. Schröder, collected 
on Goenoeng Sitoli, Nias, acg. n°. 40, 1908. 
Myrmeleon acer solers Walker. 
This is the continental form from China, but having no 
specimens from that locality at hand, I cannot give the 
distinctive characters. 
Myrmeleon nicobaricus Brauer. 
Brauer, Verh. zool. bot. Ges. Wien, XV, p. 904; Novara Exp. Zool. Thl. II, 
Abth. I, Neur. p. 43 (1865). Sambelong, Nicobars. 
I have not seen the type of this species and do not 
know what it may be, but probably it also occurs in 
Sumatra, perhaps as another subspecies. It seems not to 
belong to acer. 
Nymphidae. 
This family, which is typically australian, is intermediate 
between the Myrmeleonidae and the Osmylidae and Heme- 
robidae. The typical genus Nymphes leads over to the first 
family, the genus Myiodactylus Brauer to both latter ones. 
Notes from the Leyden Museum, Vol. XX XT. 
