48 ENTOMOLOGICAL SOCIETY 



example of sollicitans came out with the white ring on the pro 

 boscis very small and a larva of territans was seen with the 

 others. The larvae fed on the flocculent brown sediment at the 

 bottom of the pool. Some transferred to jars converted all of the 

 sediment included with them into pellets of frass in a few days. 

 A fresh-water Hydroid occurred in the same pool and proved a 

 serious enemy to the mosquitoes. A single example fastened it 

 self to the side of the glass and devoured all of the larvae but one 

 before it was noticed what was going on. It caught the larvae 

 with its tentacles and digested them bodily. Some of the larvae 

 were nearly covered with a little stalked Protozoon (Vorticella), 

 but it seemed to do them no obvious harm. 



Culcx t&niorhynchus Wied. 



Not common, though several were taken, both out of doors 

 and in the house. The larva was not met with. 



Culex pipiens Linn. 



This species, bred commonly in every rain-water barrel, bucket, 

 or old tin can in the town, and apparently nowhere else. The 

 larva was not seen in any of the natural bodies of water. The 

 fly entered the house to some extent, but was not much trouble 

 out of doors, except on the porch, and even there sollicitans was 

 the more persistent. The larvae feed upon bacteria. A dish of 

 water which was turbid and foully smelling was quickly cleared 

 and all odor destroyed by these larvae. Some were introduced 

 into water from which a number of cantans larvae had just been 

 removed, intending them as food for the Hydroid; but they all 

 died in a few hours without any obvious reason. Apparently 

 they cannot live in water fit for cantans, which lived in this 

 same water for weeks afterward. There seems no reason to 

 doubt but that this species is really the European C. pipiens Linn. 



Culex territans Walk. 



This was identified for me by Mr. Coquillett, as were all the 

 species. It was previously known to him onlv bv Walker's de 

 scription, and there seem to have been no specimens in American 

 collections. The fly was not common, and looks very much like 

 pipiens, so that it would have been hard to identify it in the 

 field. The larvae prefer cold water. A cold spring, forming a 

 pool about 20 feet in diameter, contained numbers of these 

 larvae, with a few Anopheles ; a rather cold lake formed by a dam 

 in a small stream overhung by trees contained some larvae with an 

 abundance of Anopheles and a very few Uranotaenia. They were 

 not found in a warm, scummy pool, which yielded the other 

 species freely. The larva is distinct from the other Culex here 

 noted by the peculiarly colored antennae, white in the middle 

 and blackish at the base and tip. 



