35 



cidatus and that of the comniou species of Culex in that the former is 

 noticeably lower in tone. The note of Culex as it approaches the ear 



Fig. 10.— Anopheles quadrimaculatus: Group of U eggs deposited bj- a single female as 

 they appear resting naturally on the surface of the water— enlarged (original). 



is high in pitch ; that of Anopheles is certainly several tones lower 

 and of not so clear a character. In quality it is something between the 

 buzzing of a house fly and the note of Culex. Mr. Pratt states that he 

 can at once distinguish the two genera in 

 this way as he is sitting reading in the 

 house, and the writer feels quite sure after 

 listening to them in breeding* jars that the 

 statement is correct. 



These observations have been made with 

 an abundance of material, nearly 100 adults 

 having been under observation. 



The eggs. — The well-known and often- 

 mentioned boat-shaped masses of eggs of 

 Culex are not even remotely resembled by 

 the Anopheles ovipositions, and the indi- 

 vidual eggs are equally dissimilar. In the 

 accompanying illustration (tig. 10) the egg 

 mass of Anopheles is illustrated for com- 

 parison with fig. 1. In Culex from 200 to 

 400 eggs are laid in a mass ordinarily shaped like a pointed ellipse, con- 

 vex below and concave above, all the eggs perpendicular, and stuck 



Fig. 11. — Anopheles quadrimaculatus: 

 Egg from below at left, from above 

 at right — greatly enlarged (origi- 

 nal). 



