290 AGRICULTURAL EXPERIMENT STATION. 



two shorter ones and a small joint, all articulated. The eyes 

 are normal, usually with a broad, pale yellow ring. The rotary 

 mouth brushes are pectinated on the apical third of the more 

 central hairs. The mentum (fig. 90, 4) is triangular in form 

 with slightly curved sides of fifteen small teeth each. The man- 

 dible (fig. 90, 3) has small spines on the dorsal surface of the 

 base and the maxillary palpus (fig. 90, 5) has a moderate apical 

 tuft, a rather large basal joint and patches of hair over the sur- 

 face. 



The thorax is large and stout, with two transverse depres- 

 sions and smaller transverse wrinkles on the dorsum. The sides 

 are angulated, each angle giving rise to long hair tufts, and 

 there are two very small hair tufts on the anterior margin. 



The abdominal segments are chunky, the anterior two broad, 

 with four or five hairs in each lateral tuft; segments four to 

 seven subquadrate, with two hairs to the lateral tuft, save the 

 seventh, which has small tufts only. The lateral combs of the 

 eighth segment have each fourteen to twenty-two scales, with 

 arrangement as shown in figure 6. The single scale (fig. 90, 7) 

 is broad, with a rather long acute barb and several smaller ones 

 on the sides, becoming shorter toward the base. The anal siphon 

 (fig. 90, 6) is short, about two and one-half times as long as its 

 width at the base, dark brown, almost black in color and with the 

 valves slightly dilated, so as to flare at the tip. The spines com- 

 posing the double row are curved, with two or three teeth at the 

 iDase, the terminal one sometimes without teeth. There are from 

 thirteen, to eighteen spines in each row. The ninth segment is 

 almost square, completely ringed by a chitinized saddle the same 

 color as the siphon. The ventral brush is moderate, with two or 

 three small tufts below the barred area. The double dorsal tufts 

 are normal, each with a very long hair as usual. The anal gills 

 are short, about the same length as the ninth segment. 



Habits of the Barly Stages. 



Very little is actually known concerning the early stages, full 

 grown larvae and pupae only being at hand. It is probable that 

 the species winters in the egg stage, and that it is not an early 

 species. The larvae were first taken during the last days of June 

 by Messrs. H. H. and E. Brehme from pools in the woodlands 

 back of South Orange, in company with syhestris and inusiciis, 

 and additional material obtained July 2d showed the same com- 

 bination of species. Collections made August nth and 12th in 

 the Hatfield swamp by Mr. H. H. Brehme turned out a few more 



