236 THE MOSQUITOES OF NEW JERSEY 



pools present. Growth: oaks, ash, etc., with heavy undergrowth. Pool 

 choked with vegetation, thick brown scum on top, water beneath scum 

 clear. A'edes vexans breeding. 



"Number 41. A small brooklet overflowing with surface drainage wa- 

 ter, causing temporary pools. Water stagnant in small patch of woods, 

 mostly oaks. Fairly heavy breeding of Culex pipiens and A'edes cana- 

 densis. 



"Number 43. A permanent pool on Galloping Hill Road in Borough 

 of Kenilworth. According to Mr. Russell W. Gies, superintendent of 

 the Union County Mosquito Commission, no breeding was reported 

 from this pool for several years. The pool was shaded by red and pin 

 oaks on one side. There were water lilies in the middle of the pool, also 

 some grass, and the pool was bordered by grass, weeds, and shrubbery, 

 with some dead tree trunks on the edge. 



"Number 44. A permanent drainage ditch which forms a small lake 

 during heavy rains on other side of the road from sample 43 was re- 

 ported to have bred nothing but A'edes vexans. There was sparse breed- 

 ing, at the time the sample was taken, of Psorophora ferox Humb. 



"The microscopic plants and animals present in the water, together 

 with a description of material found in the intestinal tract of the larvae 

 are given in Table III. The samples taken in these places showed (a) 

 Culex pipiens, (b) A'edes vexans, (c) Culex pipiens and A'edes canaden- 

 sis breeding together, (d) Psorophora ferox, and (e) a place v/here 

 apparently no breeding occurred for several years. A perusal of the 

 table shows that plenty of food was present in all these samples. In the 

 instance where Culex pipiens and A'edes canadensis were breeding to- 

 gether some 60,000 minute flagellates per cubic centimeter occurred in 

 addition to four other protozoa and species of microscopic plants. In 

 the case where P. posticata larvae are present no plant life was found, 

 but there occurred five protozoan species, of which one (Euglena 

 mutabilis) was present in very large numbers (270,000/cc.). In all 

 samples minute flagellates were found except where P. ferox was breed- 

 ing; for the remainder certain organisms occurred in several places 

 while not in others. 



"An examination of the intestinal tract of the larvae seems to show 

 that species of Euglena are among the favored food. The guts of C. 

 pipiens were crammed with Euglena polymorpha, while large numbers 

 of Euglena mutabilis were found in the tracts of P. ferox. Abundant 

 diatoms found in larvae from sample 41 were mostly empty shells ; some 

 did not seem to be harmed. Trachelomonas were present in various 

 stages of digestion, but in some cases the animals were alive and moving. 



