PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



3G9 



8. Booklets on prolcgs forming a half circle which is 



open externally ; booklets on internal edge of sole 

 largest, diminishing in size externally 



Booklets on prolegs forming a complete or almost 

 complete circle ...... 



9. Spiracles touching, or situated in, the stripe above 



them ; stripes grey-brown ; booklets on internal 

 edge of sole largest, diminishing in size exter- 

 nally 



Spiracles situated well below the stripe above them ; 

 stripes reddish brown ; booklets on prolcgs practi- 

 cally equal in size or those on external edge 

 slightly smaller than those on internal edge 



10. Spiracles open, i.e., with a clear space inside . 

 Spiracles closed, i.e., without a clear space inside . 



11. The* posterior trapezoidal warts in a line with the 



anterior trapezoidal warts ; booklets on prolegs 

 in a complete circle, largest on internal edge of 

 sole, diminishing in size externally (Caterpillars 

 usually with prominent warts and no stripes ; 

 sometimes warts absent and some markings 

 present on side of the segments) 



The posterior trapezoidal warts much further re- 

 moved from the middorsal line than the anterior 

 trapezoidal warts ; booklets on prolegs much as 

 in C. S. 1010 



12. Booklets on prolegs forming a half circle open 



externally ; those on internal edge of sole largest 

 diminishing in size externally ; spiracles with a 

 rather closed slit along their longer axis ; cater- 

 pillars with two stripes on each side of back 



Booklets on prolegs forming a complete or almost 

 complete circle ...... 



13. Booklets in a complete circle and equal in size; 



spiracles with rather an open slit along their 

 major axis ....... 



Booklets in a more or less complete circle and much 

 shorter externally ; spiracles with an oval-shaped 

 concavity whoso major axis coincides with that 

 of spiracles ; caterpillars usually with large shiny 

 dark-brown warts situated on broad pinkish 

 stripes, warts disappearing in hibernating larvai 



Dialrcea auricilia. 

 (C. S. 1574). 



9 



Rice Chilo (C. S. 1077), 



C. S. 1074. 

 11 

 12 



C. S. 1010. 

 C. S, 1709. 



C. S. 1831. 

 13 



Chilo simplex. 

 (C. S. 1551.) 



Dialrcea vetiosata 

 (C. S. 1007). 



The pupal forms of the species of Raphitnetopus (Anerastia), Diatrcea 

 and Chilo, which are likely to be and had hitherto been confused in the 

 adult stage, can be distinguished with the help of the following key. 



Pupa without any chitinous protuberances on anal 

 segment which has a few circinate hairs 



Pupa with chitinous protuberances on anal segment 



Pupa without spines, hooks, ridges or collar-like 

 roughness on 7th abdominal segment . . 



Pupa with such ...... 



Raphimetopus {Aner- 

 astia) ablutella 

 (C. S. 1801). 

 2 



C. S. 1077. 

 3 



2 b2 



