586 ENTOMOLOGICAL NEWS. [November, 



on June 9th, 13th, i6th and 20th, and by the 25th pupation was 

 well under way. On July 12th three imagines appeared, and 

 by the 20th over thirty had emerged. All were diffinis save a 

 few cethra and Figs. 9 to 18 inclusive, in the plate, are from 

 this brood, from eggs of tetuds. A number died in pupa and 

 the balance at this writing (September 13th) seem inclined to 

 winter. Whether they will emerge in the spring as teiiuis or 

 diffinis remains to be seen. 



It is impossible for a photograph to present the gradations in 

 color which are shown by the specimens represented in the plate. 

 A few words of description will therefore be necessary. 



Fig. I is the original diffinis, $ , caught August i, 1899. From her eggs 

 were obtained which in May following produced tenuis. Figs. 2 to 8 in- 

 clusive being selected from this brood. 



Figs. 2 and 3. — Tenuis, killed before wings were fluttered; these are 

 Strecker's y«W(?.yrt; they show the even inner margin of fore wings, and 

 the colors are light lemon-yellow and black ; the sides of abdomen show 

 blue spots. 



Figs. 4 and 5. — Tenuis ; wings clear through loss of scales by fluttering. 



No. 4 shows thick outer border and No. 5 a very narrow one ; both even 

 on inner edge of outer border of fore wings and colors white-yellow and 

 black. 



Figs. 6 and 7. — Tenuis; body colored, as in tenuis, but inner margir> 

 of fore wings beginning to show indentations. 



Fig. 8. — Body colors deeper yellow and inner margin serrate ; an ap- 

 proach to diffinis. 



All of the above of same brood, from eggs of diffinis, laid Aug. i, '99; 

 flies emerged May 15th to 30th, 1900, 



Figs. 9, through 18, all from eggs from a tenuis $ of the above brood. 



Fig. 9. Diffinis ; thorax and patagise and end of abdomen deep buff 

 yellow and greenish ; upper part of abdomen rust brown ; inner edge of 

 outer border of fore wings distinctly serrate. 



F'ig. 10. — Diffinis. Outer border broad. 



Fig. II. — j^lhra. Abdomen lacking dark color on upper portion, 

 being colored like thorax ; apical spot of fore wings very red, veins of 

 wings red, especially beneath ; inner margin hind wings carmine. Killed 

 before fluttering ; hence smoky wings. 



Fig. 12, AClhra, as above; wings clear; killed after wings were 

 shaken. 



F"'K' 13- — Diffinis ; very dark ; scarcely any yellow on the brown red 

 alxiomen ; opposite extreme to alhra ; wings barely indented. 



Fig. 14. — Diffinis as to color of body, athra as to red veins and wing 

 borders. 



