REPORT ON MOSQUITOES. 



Ill 



Species zvhich have been Suggested as Possible Mosquito De- 

 stroyers; but zcliich are of Practically no Value. 



APKLTES QUADRACUS. 



Fonr-spined Stickleback. 



"Sticklebacks have been mentioned as possible destroyers of 

 mosquito larvae. There is but one species to be found above 

 brackish water in the Delaware River, the four-spined Apeltcs 

 quadracus. This species is very small, the male attaining- a length 

 of about one inch, and the female about one and three-quarter 

 inches. It is a bottom feeder, hiding under and among aquatic 

 plants, logs, sticks or any sort of debris on the bottom of ditches 



Figure 33. 



Apeltes quadracus: 4-spined stickleback. (From Jordan & Ev.ermann, Bull. 47, U. 

 S. Nat. Mus.) 



and pools along the shores of the Delaware and its tributaries. 

 It is undoubtedly useless for the desired purpose and should not 

 be further considered. The other species rarely g-o above brack- 

 ish water and are seldom found out of the deeper channels." 



UMBRA PYGM.^A. 



Striped Mud Minnozv; Eastern Mud Minnozu. 



"Widely distributed but not abundant anywhere; solitary, 

 sluggish ; always among plants. Not worthy of consideration in 

 connection with the mosquito problem." 



The species grows to a length of about five inches and is easily 

 known by the prominent black bar just behind the end of the 



