June, '03] ENTOMOLOGICAL NEWS. 181 



that larvae of all sizes occurred in the jar. The growth is slow 

 and it seems doubtful if the March larvae will give adults before 

 May. The larvae are rather deliberate in their motions and 

 habitually remain long below the water. They can be seen 

 browsing along the sides of the jar well below the surface, 

 feeding on the green Protococcus that grows there. Occasion- 

 ally they rise and push the breathing tube through the surface 

 film for a few seconds, but they do not remain hanging there 

 but shortly descend to resume browsing. The anal processes 

 are long and well supplied with tracheae, which permits the 

 larvae to remain long under water. It would seem as if there 

 should be more than one brood in a year, but I am not certain 

 that this is the case. Larvae are found late in Fall and probably 

 many remain in the pot holes after the water freezes ; but such 

 must perish, as they could never withstand the rush of the 

 vSpring floods even if they survived the wanter in the ice. The 

 adults do not seem to live long. Those bred in October lived 

 but a few weeks and I doubt whether they normally hibernate. 



I have described the eggs and mature larvae (Jour. N. Y. Ent. 

 Soc, X, 195, 1902). In the first stage the head is round, flat- 

 tened, evenly rounded, narrowed before the antennae, blackish 

 infuscated, eyes elliptical, black, antennae moderate, uniform, 

 infuscated, a single hair a little before the middle, terminal 

 hair and spines normal ; labial plate small with pronounced 

 central tooth, side teeth minute ; brushes normal. Thorax 

 enlarged, flattened; body submoniliform, tapering posteriorly- 

 normal ; thoracic hairs longer than the width of thorax, deli- 

 cate, moderate ; abdominal hairs distinct on five segments but 

 weaker and fewer posteriorly, twice as long as the width of a 

 segment, very weak on the sixth segment, invisible on the 

 seventh arid eighth. Lateral comb of the eighth segment a 

 single row of stout spines. Tube colorless, with a small term- 

 inal, infuscated ring. Anal segment dorsally plated, plate 

 infuscated, a stout dorsal tuft, no ventral brush. Anal pro- 

 cesses four, about as long as the segment, conical, with numer- 

 ous tracheae. 



In the second stage the head is darkly blackish, the body 

 pale. Hairs stronger, diminishing posteriorly. Air tube short, 



