64 ENTOMOLOGICAL NEWS [Feb., '15 



Both of these forms have, in their earliest imaginal state, the eighth 

 and ninth abdominal segments pale blue, each segment with a lateral 

 black stripe each side, extending from the fore end to two-thirds 6f 

 the segment's length on 8, and to half-length of 9. The right and left 

 lateral black stripes are connected with each other on each segment by 

 a transverse black stripe at the fore end, which cross-stripe is distinctly 

 wider (equal in some to even one-fourth of the segment's length) on 

 8 than on 9 (on the latter a little more than a line). 



There is no constant difference in the size of these two females. 



The homoeochromatic female from which I have chiefly 

 drawn up this description appears, from its chitinization, to 

 he more immature than the heterochromatic female which I 

 employed. There is, therefore, no ground for supposing that 

 the former is an older and in consequence a more blackened 

 form of the latter. Judging from the material before me, bqth 

 the homoeochromatic and the heterochromatic females above 

 described, become darkened and eventually pruinose. One 

 can, in some cases, determine whether a partly blackened fe- 

 male belonged originally to one or the other form by examin- 

 ing carefully those parts compared in the table on page 63 and 

 recognizing their shape, size or tint under the partial conceal- 

 ment of the changing colors. Probably the pale blue on ab- 

 dominal segments 8 and 9 disappears earlier in the hetero- 

 chromatic females than in others. 



A hint that occasionally an intermediate or a composite of 

 the two forms exists is afforded by a well-chitinized female 

 taken by myself at Delair, New Jersey, August 13, 1903. In 

 most respects it agrees with our table for the homoeochromatic 

 form, but differs therefrom in having the pale post-ocular 

 spots confluent for about one-third of the width of each with 

 the pale color of the rear of the head, the sides of abdominal 

 segment 3 with an orange tinge which invades the dorsum in 

 the anterior two-fifths of the segment, leaving only a narrow 

 mid-dorsal black line on this part of the segment and two or 

 three small isolated black spots on the sides, the posterior 

 three-fifths of the dorsum being solidly metallic greenish-black. 



