370 PROCEEDINGS OF THE THIED ENTOMOLOGICAL MEETING • 



3. Pupa with scattered spines on 7th abdominal seg- 



ment formed out of the larval tubercles . . C. S. 1835. 

 Pupa with continuous ridges, hooks, spines or 

 roughness in the form of a collar on 7th abdominal 

 segment ........ 4 



4. The collar makes a complete circle round the seg- 



ment ........ 5 



The collar makes a circle incomplete on the ventral 



side 6 



5. The circle composed of distinct and separate double 



hooks C. S. 1610. 



The circle composed of ridges, more or less joined . Diatrcea auricilia,- 



S. Incomplete circle of distinct straight spines . . C. S. 1674. 

 Incomplete circle of roughness .... 7 



7. Dorsal part of anal end with six spines in two groups 



of three, triangularly arranged .... Chilo simplex. 



(C. S. 1551). 

 Dorsal part of anal end with four spines . . 8 



8. The spines situated on the tip and pointing 



posteriorly ....... Diatrcea venosata 



(C. S. 1607). 

 The spines situated on the dorsal margin and 



pointing dorsally 9 



9. The collar of roughness on 7th abdominal segment 



extending much beyond the spiracles . . C. S. 1769. 



The collar extending up to the spiracles . . C. S. 1795. 



The col\ar net extending up to the spiracles . . C. S. 1831. 



Lije-histories of the Borers. 

 The life-histories of the borers are given in the following pages. 

 Ihe observations were carried on principally in the year 1918. In order 

 to give some idea of the nature of the year regarding rainfall, temperature 

 and humidity a chart is appended giving weekly rainfall, weekly mean 

 temperature (dry bulb at 8 a.m.) and weekly mean humidity, calculated 

 from the records at Pusa. (Plate 28.) 



The Anihomyiad Flies, 

 Plate 29. 

 Foodplants — 



Jvar {And^-opogon sm-gh\nn) — October, January, May, August^ 



September, July. 

 China (Panicum miliaceum) — July, May. 

 Samighas {Panicnvi colomim) — July. 

 Kcdon (Paspalum scrohicidatiim) — July. 

 Sudan grass — August. 

 Eice — April, June. 

 Soma (Panicum frumeniaceitm) — September, 



