340 AGRICULTURAL EXPERIMENT STATION. 



arate pit, the pits so arranged as to form a square; a small tuft 

 of four or live hairs is also at the base of each antenna. The 

 antenna (fig. 107, 4) is uniformly brown, rather short, sparsely- 

 set with short spines and terminating with two very long spines, 

 two shorter ones and a small joint ; the tuft is represented by a 

 single stout seta situated one-third from the base. The rotary 

 mouth brushes (fig. 107, 2) are small, composed of simple hair. 

 The mentum (fig. 107, 5) is triangular, very chunky, with nine or 

 eleven blunt teeth, the largest at the apex, the smallest toward the 

 base. The mandible (fig. 107, 6) and the maxillary palpus 

 (fig. 107, 3) are also both chunky, the former peculiar by a 

 group of blunt black teeth and four dorsal spines, one of which is 

 finely comb-toothed, while the latter has no apical tuft, but is 

 thickly clothed with short hairs, and the basal joint is small, with 

 four very long, blunt terminal spines. 



The thorax is angular and at least one and one-half times as 

 broad as long, each lateral angle giving rise to long hair tufts. 

 Two smaller tufts are on the anterior margin and six stellate 

 hairs, two in the anterior part and four in posterior part are on 

 the dorsal surface. 



The abdominal segments are subequal, rather deeply con- 

 stricted at the sutures. The lateral prominences of the anterior 

 two segments have each about four long hairs, the following 

 segments with only short stellate hairs at the sides. On the 

 dorsal surface each segment has two other stellate hairs, in addi- 

 tion to the lateral ones. The eighth segment has large lateral 

 plates, with a row of six to nine stout spines on the posterior 

 edge, each spine finely fringed with hairs at the sides, as in figure 

 8. The anal siphon (fig. 107, 7) is three to three and one-half 

 times as long as broad, only a little narrow'er at the apex than at 

 the base and is slightly concave; the apex with four processes, 

 which are dilated so as to flare at the tip. 



The lateral rows of spines are composed of from twelve to 

 fourteen each, the single spine (fig. 107, 9) destitute of basal 

 teeth, but fringed with fine long hairs at the base and apex. The 

 ninth segment is longer than broad, w'ith the anal gills about as 

 long as this segment; the double dorsal tuft and ventral brush 

 composed of long hairs of equal length, the latter very small and 

 confined to the barred area. 



Habits of the Early Stages. 



The early stages of this species were observed by Mr. Brake- 

 ley and myself at Lahaway and by Dr. Dyar, at Bellport, Long 

 Island. The latter published an account in the Journal of the 



