OF MEGALOPTERA. 



263 



streaks between the lower cubitus and the analveins. Ner- 

 vature black, except in the light spots and some veins of 

 the apicalfield, which are yellow. 



Body $ 28 mm., forew. 37 mm., hindw. 34 mm., cost, forew. 25. 

 Abd. £ 13 mm., gr.br. 141 mm., gr. br. 15 ram., cost, hindw. 25. 



Habitat: India. 



One female from Manipur (Dr. Watts) is in the British 

 Museum. 



Ctenochauliodes, nov. gen. 



This genus is characterised by the pectinate antennae 

 in both sexes. 



The type is Ch. nigrovenosus Weele from Tonkin. 



Subfam. Sialidinae. 



This subfamily only consists of one tribe, the Sialini, 

 which contains only two genera: Sialis and Protosialis. 



Protosialis, nov. gen. 



Body and wing9 more slender than in Sialis. Colour of 

 the body black with orange. Antennae in the male thick 

 and pilose, in the female thin and naked. 



Wings elongate and narrow, elliptical, with dark mem- 

 brane and thin nervature, so that the latter is not so 

 distinct. The costal-area is not enlarged before the middle 

 but gradually narrowed. The costalveins have an oblique 

 direction, not a vertical one as in Sialis. The radialsector 

 has two branches, the first of them being one-forked, the 

 second simple and as long as the last simple end of the 

 radius. In Sialis these last two branches are always forked. 



Habitat: North- and Central America, Cuba and Chile. 



The type of the genus is S. americana Ramb., and other 

 species of it are mexicana Banks, bifasciata Hagen and 

 chilensis Mac Lach lan. 



Notes from the Leyden Museum, Vol. XXX. 



