476 REPORT OF THE COMMISSIONER OF AGRICULTtJRE. 



long stout hair, wMch. is as long as the whole body. The body above 

 shows G rows of secretory pores, 4 along the middle, and 1 on each 

 side. More or less regular rows of hairs alternate with these pores. 



Female Larva — second Stage. — According to Maskell and Corn- 

 stock, there are but three stages of growth in the female after hatch- 

 ing, and these are readily distinguished by the number of antennal 

 joints; the larva of the first stage having G, that of the second U, and 

 the adult 11. Messrs. Coquillett and Koebele came to the same con- 

 clusions, and all have overlooked a form which we have found quite 

 abundantly among the material we have studied, and which seems to 

 constitute an intermediate stage between the so-called first and second, 

 and which is of course produced by an additional molt which we have 

 personally observed in the field. Hence the so-called ' ' second stage " 

 of these authors becomes third, while the adult female is fourth in- 

 stead of third, and there are 3 molts instead of 2. 



This new intermediate form (Plate II, Fig. 3) differs from the 

 female larva of the first stage in the following respects: It is much 

 more rounded and of a stouter general appearance. The antennae 

 have the same number of joints, G, but their relative proportions are 

 quite different. The antennae as a whole are relatively much shorter. 

 Joint 1 is short and stout, its length equalling its breadth; joint 2 

 equals joint 1 in length, but is not quite so broad ; joint 3 is as broad 

 as joint 2, but is twice as long ; joints 4 and 5 are equal in length and 

 width, each narrowing somewhat at base and tip, each considerably 

 narrower than joint 3, and each of the same length as joint 2 ; joint 

 G (club) is of an irregular shape ; at base it is as narrow as joint 5, 

 but it broadens until it is slightly wider than 2 or 3, and its tip is 

 narrowed again; its shape is that of an irregular rhomboid with 

 rounded angles and sides, the acutest angles at base and tip. The 

 antennae carry about the same number of hairs as in the first stage, 

 but those homologous with the four very long hairs of the club in 

 that stage are in this second stage but little longer than the other an- 

 tennal hairs. The eyes do not appear on the margin of the body, and 

 are only seen on a ventral view. The legs are proportionately much 

 shorter, and the femora are stouter ; the trochanters are broader dis- 

 tally, and consequently form a broader triangle in shape. The six 

 tubercles at the anal end of the body are still j^i'esent, but the hairs 

 which they bear are much shorter. The secretory pores are no longer 

 arranged in rows, but are scattered sparsely over the back and under 

 the sides. The back is more hairy, and the short black hairs occur 

 in irregular tufts. 



Female Larva — third Stage (Plate II, Fig. 4). — That which has 

 heretofore been considered the second stage, and which, as we have 

 just seen, is the third, may be described as follows : 



The body is broadly oval in shape and reddish-brown in color, but . 

 is soon obscured more or less by the thick, curly, cotton-like excretion. 

 The antennae are 9-jointed instead of 6, and are subcylindrical, taper- 

 ing somewhat from base to tip. Joints 4, 5, 6, 7, and 8 are subequal in 

 length, and each is about as long as broad ; joints 2 and 3 are broader 

 and considerably longer ; joint 1 is like the corresponding joint in the 

 previous stage; joint 9 (club) is a suboval joint, proportionately much 

 smeJler than in the previous stages ; it does not exceed joint 8 in 

 width, and it does not quite equal joints 7. and 8 together in length. 

 The long hairs of the club are proportionately quite short. The in- 

 sect as a whole is much more hairy than in either of the previous 

 stages. The hairs are short and black, and show a marked tendency 



