284 AN INTRODUCTION TO ENTOMOLOGY 



E. Antenn£E short; wings with an elongate cell behind the point 



of fusion of veins Sc and Rj. p. 303 Myrmeleonid^ 



EE. Antennae long; wings without an elongate cell behind the 



I)oint of fusion of veins Sc and Ri. p. 305 AscALAPHiD/E 



DD. Antennas not enlarged towards the end. 



E. Male with pectinate antennae; female with an exserted 



ovipositor, p. 297 DlL.\RiDiE 



EE. Antennae not pectinate in either sex; female without ex- 

 serted ovipositor. 

 F. Radius of the fore wings with apparently two or more 

 sectors. 

 G. Radius of the fore wings with apparently two sectors, 

 one of which is vein R2 +3 and the other veinR4+s- 



p. 293 SYMPHEROBIIDiE 



GG. Radius of the fore wings with three or more sectors. 

 Veins R4 and Rj arise separately from vein Rj; 

 one or more definitive accessory branches of the 



radius of the fore wings present, p. 294 



Hemerobiid^ 



PP. Radius, of the fore wings with a single sector. 



G. Radial sector of the fore wings without definitive 

 accessory veins although marginal accessory 



veins are present, p. 291 Sisyrid^ 



GG. Radial sector of fore wings with definitive ac- 

 cessory veins. 

 H. Transverse veins between the costa and sub- 



costa simple, p. 299 Chrysopid^e 



HH. Many of the transverse veins between the 

 costa and subcosta forked. 



I. Humeral cross- vein recurved and branch- 



ed; first radio-medial cross- vein of the 

 hind wings longitudinal and sigmoid. 



p. 298 POLYSTCECHOTID^ 



II. Humeral cross-vein not recurved; first 

 radio-medial cross-vein of the hind wings 

 transverse, p. 298 BEROTHIDiE 



Family SIALID^* 

 The Sialids 



The members of the SiaHda; differ greatly in size and appearance; 

 but they agree in having the hind wings broad at the base with the 

 anal area folded like a fan when not in use. In this respect they 

 differ from all other Neuroptera. 



The type of the wing-venation of the sialids differs greatly in the 

 two subfamilies into which the family is divided, as described below. 



The larvas are aquatic, predacious, campodeiform, and possess 

 paired, lateral filaments on most or on all of the abdominal segments. 

 They leave the water when full-grown and transform in earthen cells 

 on the banks of the streams or lakes in which they lived as larvse. 

 The eggs are deposited in clusters on any convenient support near 

 the water, in such situations that the young larvae can easily find 



*This family is separated from the Neuroptera by Handlirsch ('o6-'o8) as a 

 distinct order, the Megaloptera. H. W. Van der Weele ('10) also separates it 

 from the Neuroptera, but he associates with it the family Raphidiidae in his order 

 Megaloptera. 



