164 



Cincinnati Society of Natural History. 



of the other segments being provided with a single row of 

 minute, short bristles, with two larger ones on the seutellum. 



In the majority of my specimens the anal hooks are as 

 described and shown in the figure. In some, however, they 

 are bifid, one hook extending upward and the other down- 

 ward, in which case the spines are much stouter, while 

 beneath are two very short, stubby, hooked appendages. In 

 one specimen one of the anal hooks is bifid and the other 

 simple, and beneath the former is one of the short appendages, 

 while there are two of these, closely placed beneath the latter. 



Egg: The egg is 1.15 mm. long, with the greatest diam- 

 eter considerably less than one-third the length ; form 

 elongated, with the ends equal and obtusely conoid. The 

 shell is very flexible, and when, as is often the case, they are 

 crowded into a small space, the form is often greatly distorted. 

 When first deposited they are of a white color, but soon take 

 on a yellowish cast. The egg period is eight days, though 

 granulation is not clearly visible until the third day ; on 

 the fourth, there appears near each end a narrow, semi- 

 transparent band, while the granulation is much coarser; on 

 the filth, the blastodermic disc is clearly defined, the bands 

 becoming wider ; on the sixth, one of the bands has nearly 

 disappeared, and the other has more than doubled in width, 

 segmentation having clearly begun ; on the seventh, one 

 band has entirely disappeared, and the semi-transparent space 

 along one side, which is first observed on the fifth day, is now 

 much wider, and extends from the semi-transparent band 

 nearly to the opposite end of the egg, with granulation of 

 blastodermic disc very coarse, and segmentation progressing 

 very rapidly ; on the eighth, segmentation more clear, and 

 quickening was first observed ; on the ninth, the young larva 

 appears, being but very slightly larger than the egg, from 

 which it gains exit by backing out, the brownish tips of the 

 mandibles being clearly visible through the shell. 



HABITS OF THE ADULT. 



In Northern Ohio the larvae pupate, largely at least, in 

 June, though I have found pupae in limited numbers on the 

 eighth of August, which transformed to adults two days later, 



