152 APTERA. 



p. 2999. Fabr. Spec. Ins. 1. p. 373. Mant. Ins. 1. 

 p. 240. Ent. Syst. 2. p. 491. 



Mutter, Entomostr.p. 82. £. 12./. 4 — 7. 



Lederm. Microscop. t.75.f.2 



Schaeff. Elem. t. 29 /. 3, 4. 



Jcow. t. 150. yi 5. a. 6. 



Inhabits stagnant water. Is sometimes so abundant 

 as to tinge the water of a reddish colour. 



PI. 83. a. The natural size. b. The same mag- 

 nified. 



