282 ENTOMOLOGICAL NEWS. [Oct., 'o6 



which are the principal factors with which the sanitarian has 

 to deal. Since the young larvae of Anopheles and that of Culex 

 territans resemble one another in general appearance, and both 

 possess the same food habit and remain at the surface of the 

 water up to the 4th or 5th day, we may briefly compare the 

 two forms, for it is not within the limits of these notes to give 

 an account of the interesting life history of C. territans, which 

 has not been treated completely. 



The egg laying process of C. territans is somewhat similar 

 to that of C. pipiens, the mass is built on the same geometrical 

 plan, but the eggs are smaller and the process of color trans- 

 formations are different. The mass usually contains about 150 

 eggs, and are of a canary-yellow color when deposited ; the 

 usual color changes taking place in about 10 hours when they 

 may be found changed to a polished black color. The egg 

 state in May and early part of June is about 38 hours. The 

 young larvae when first hatched differ from those of C. pipiens 

 in many respects. Up to about 4 or 5 days old they are of a 

 brown color. The thorax is of a pale or whitish color ante- 

 riorly, while the posterior part is brown. The first 3 abdom- 

 inal segments are of a brown color, but the 4th abdominal seg- 

 ment is colorless, and the 5th, 6th and 7th are dark brown. 

 The general shape is more slender than that of C. pipieiis of 

 the same age, which renders it a different picture from the 

 latter when seen on the water. It seems more pointed towards 

 the end or wedge shaped like that of A. punctipennis of same 

 age, when seen with the naked eye. It requires close obser- 

 vation to recognize the difference from the latter since they are 

 often found of about the same color and both spotted black and 

 w T hite. In A. punctipennis the 3rd abdominal segment is white; 

 in C. territans the 4th segment is white at the same age. The 

 larvae of C. territa?is at this period of its life seems to lie hori- 

 zontally at the surface of the water like Anopheles, but virtu- 

 ally it is below the surface, generally to the depth of the length 

 of its breathing tube. 



Like the larvae of A. punctipennis those of C. territa?is, when 

 disturbed, will remain on the surface of the water, dart away 

 in different directions in short jerky interruptions of move- 



