NEUKOPTERA. 



2ig 



CC. Mouth not prolonged into a rostrum. 

 BB. Posterior wings with a folded anal space.* 

 C. Wings reticulate. Prothorax hu 

 CC. Wings with rather few transverse veins. 



AA. Windless, or with rudimentary wings. 

 H. Mouth prolonged into a rostrum. 

 BB. Mouth not prolonged into a rostrum. 



2. HEMEROBIAD^E. 



i. Si. \i 

 Prothorax small. 



4. PHKYC.ANElDjE. 



; v PAHOI 

 4. PHRV 



Family I. SlALlD..f 



(The Dobson ct al.) 



There is no common name by which the members of this family 



as a whole are known. They are, however, easily recognized. 



Although the typical genus, Sia/is, 



includes insects of moderate si/.e, 



our most common forms are large. 



All are characterized by having the 



second pair of wings with a folded 



anal space, and by having a large 



prothorax. This segment is either 



quadrangular or cylindrical and long 



The larvae of all of the forms 



occurring in the Eastern United 



.re aquatic, living chiefly 



in the bed of swiftly- 



iins. They are carniv- 



oroi 



This family is represented in our 

 fauna by four genera. These e.m 

 ited by the following table: 



A Wini,'- .terostigma ; prothorax 



^ular. 



Si A i 



BB. With three < 



C. Latero-caudal angles of head un- 

 armed. TranSVCrse Veins Of W: ,i.-Oryrf/*i ./*. adult. 



slender. 

 CC 1 angles of head with a sharp tooth < veins of 



Coi 



A A. Winvjs with pt< .ix cylindrical and ! III.IA. 



The anal upocc U abaeni in a few PhrygMieidc. 



f Sialkiv, Stalij. : /M^(crmAur), aaliva. 



