90 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



The names used here for these borers (Chilo and Diatrcea 

 spp.) in Gramineous plants must be regarded for the pre- 

 sent only as those under which we have known these species 

 hitherto, without any guarantee of accuracy of application, 

 and they are only given here to allow of comparison between 

 the current Report and that for last year. 



Bearing the above remarks in mind, we may now turn 

 to the species distinguished up to date. Those included in 

 last year's Report were : — 



(1) Chilo simplex (C. S. 1561 and 1580). (Plate III.) 



(2) Diatrcea duricilia (C. S. 1560 and 1574). (Plate 



IV.) 



(3) Diatrcea venosata *(C. S. 1607 and 1635). (Plate 



v.) 



(4) Diatrcea sp. (C. S. 1610). (Plate VI.) 



In addition to these we have now discriminated : — 



(5) ? Diatrma sp. in sugarcane at Dacca (C. S. 1674). 



(Plate VII.) 



(6) Rice Chilo in rice at Pusa (C. S. 1677). (Plate 



VIII.) 



(7) ? Chilo sp. in rice (C. S. 1768). 



(8) ? Chilo sp. in Saccharum arundinaceum (0. S. 



1769). 



(9) ? Child sp. in Saccharum fuscum (C. S. 1795). 

 (10) ? Anerastia ablutella in sugarcane (C. S. 1801). 



(Plate IX.) 

 Of these, the first six occur in large numbers, whilst the last 

 four have only been found in very small numbers. Of these 

 ten, three (C. S. 1768, 1769 and 1795) have as yet been insuffi- 

 ciently studied, but the other seven species may be separated 

 in their larval and pupal stages by means of the following 

 dichotomic keys, and figures are added to enable the 

 distinctions to be grasped more readily. 



Key to larval forms of Borers. 



1. Spiracles round . . . . (C. S. 1801) 



Spiracles oval . . . . .2 

 %. With mid-dorsal stripe; spiracles open 3 



