PEOCEEDINGS OF THE THIHD ENTOMOLOGICAL MEETING ObSJ 



■S. Hooklets on prolegs forming a half circle which is 

 open externally ; hooklets on internal edge of sole 

 largest, diminishing in size extema^y . . Diatrcea auricilia, 



(C. S. 1574). 

 Hooklets on prolegs forming a complete or almost 



complete circle ...... 9 



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

 them ; stripes grey-brown ; hooklets on internal 

 edge of sole largest, diminishing in size exter- 

 nally Rice Chilo (C. S. 1677). 



Spiracles situated well below the stripe above them ; 

 stripes reddish brown ; hooklets on prolegs practi- 

 cally equal in size or those on external edge 

 slightly smaller than those on internal edge . C. S. 167-t. 



10. Spiracles open, i.e., with a clear space inside . 11 

 Spiracles closed, i.e., without a clear space inside . 12 



11. The posterior trapezoidal warts in a line with the 



anterior trapezoidal warts ; hooklets 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) . . . C. S. 1610. 

 The posterior trapezoidal warts much further re- 

 moved from the middorsal line than the anterior 

 trapezoidal warts ; hooklets on prolegs much as * 



inC. S. 1610 C. S, 1709. 



12. Hooklets on prolegs forming a half circle open 



externally ; those on internal edge of sole largest 

 diminishing in size externally ; spiracles with a 

 rather closed sUt along their longer axis ; cater- 

 pillars with two stripes on each side of back . C. S. 1831. 

 Hooklets on prolegs forming a complete or almost 



complete circle ...... l:i 



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



spiracles with rather an open slit along their 



major axis ....... Chilo simplex. 



(C. S. 1551.) 

 Hooklets in a more or less complete circle and much 

 shorter externally ; spiracles with an oval-shaped 

 concavity whose major axis coincides with that 

 of spiracles ; caterpillars usually with large shiny 

 dark-brown warts situated on broad pinkish 

 stripes, warts disappearing in hibernating larvse Diatrcea veiiosata 



(C. S. 1607). 



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

 and C/iito, which are hkely to be and had hitherto been confused in the 

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



1. Pupa without any chitinous protuberances on anal 



segment which has a few circinate hairs . . Raphimetopus (Aner- 

 astia) ablulella 

 (C. S. 1801). 

 Pupa with chitinous protuberances on anal segment 2 



2. Pupa without spines, hooks, ridges or collar-like 



roughness on 7th abdominal segment , . .0. S. 1677. 

 Pupa with such 3 



