264 AGRICULTURAL EXPERIMENT STATION. 



ishing in size posteriorly, the seventh with small hair tufts only. 

 The eighth segment has lateral patches of scales, from twenty- 

 five to thirty-five in each patch ; the single scales very small, 

 rather broad and with fine, long fringes confined to the broad 

 apex. The anal siphon is dark brown, about twice as broad as 

 long and evenly tapered toward the apex. The double row of 

 spines extends almost to the apex and consists of seventeen to 

 twenty-one each, the individual spines broad at the base, with 

 two or three large teeth and sometimes a small one on the oppo- 

 site side as shown in figure 8. The siphonal tuft is situated in the 

 center of the siphon, slightly nearer the apex and this is the only 

 species where the spines exceed the tuft ; usually it terminates the 

 row. The ninth segment is very small, the dorsal half saddled 

 by a dark brown chitinized plate; the ventral brush is moderate 

 and usually confined to the barred area, though rarely small tufts 

 are below it ; the double dorsal tuft is normal, each with one long- 

 hair. The anal gills are sl'ender, a little longer than the ninth 

 segment. 



Habits of the Barly Stages. 



According to Dyar the eggs in fall are laid in patches on the 

 rock side of the pot holes where the larvse occur, usually at a 

 time when the water is low, and the winter is passed in that con- 

 dition. They begin to hatch in March, but irregularly, and the 

 larvae grow slowly. From adults matured late in April eggs 

 were obtained after two weeks and these were scattered loosely 

 over the surface of the water, not adherent to the sides, in patches. 

 The eggs are black, elliptical, the ends round pointed, coarsely 

 reticulated. Those laid in spring hatched in three days and there 

 are. probably, several broods during the season. I have had under 

 observation only one lot of the larvae brought down from Isles- 

 boro, Maine, by my young son, and these agreed so well in habit 

 with what Dyar says of them that I can do no better than quote : 

 "The larv?e 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 

 Protococcits that grows there. Occasionally 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 

 Avith trachae, which permits the lan^as to remain long under 

 water." 



