AN INTROr \TOMOLOGY. 



The genus 5 anomalous in that its larva- arc aquatic. We 



have a singi< - described from .. This is a small in 



f only 9 mm. (0.35 inch). 



Polysid'chotcs is confined to this continent. These arc la 

 having an alar c f from 50 to 75 mm. (2 to 3 incl. 



They are rxocturnal. ami arc attracted to lights. T\ 



!i described. P. pm: a our most common one; it is black- 



with three longitudinal lines on the disk of the prothorax, and 

 the lateral margins of this segment yellowish. J\ rittdtits is ; 

 yellowish, with a black stripe on the sides of the th>rax, .mil with 

 the abdomen dark brown. The larva of neither of these specie 

 known. They are probably aquatic. 



::is includes smallish .species having an alar expanse of 

 from 10 to 20 mm. (0.4 to O.8 inch). My personal experience It 

 me to believe that they are rare ; and I find no published accounts 

 of the appearance and habits of the larvae. 



Hcmcrobius is much better known ; although the species of this 



ire not common. More than twenty North American spcv 

 have been described. These are also smallish insects ranging in 

 alar expanse from 8 to 20 mm. (0.3 to 0.8 inch). They occur in 

 forests, and especially on Coniferous trees. The larvae bear a strong 

 resemblance to the Aphis-lions; and like them feed upon Aphids 

 and other small insects. After sucking the fluids from their victims, 

 they make a cloak for themselves of the empty skins. 



Sub-family III. CllRYSOPIN^S. 



(La . (/ I : lics or Aphis-lions.) 



Nearly all of tli - of this sub-family pertain to the genus 



Chrysopa. These insects are known in the adult slate as Lace-win 



. 



i nil adult 



Flies, and in the larval form as Aphis-lions. Tin- antenna.- of the 

 adult are long and setaceous; the venation of the wings resemble- 

 somewhat that of the preceding sub-family; but the subcostal and 



