24 The Cane Grubs of Australia. 



The Pupa. 



PupjB have been obtained in confinement on September 2'8th, Octo- 

 ber 26th, 31st, November 10th, December 2nd and 6th. A pupating 

 larva was collected in a canefield, November 17th. 



The Adult. 



Unemerged adults have been taken in confiniMiiont on October 25th, 

 November 7th, December 9th. Adults have flown to lights on January 

 15th and 30th. 



HETERONYX Sp. No. 646. 



Stage II. has been recorded on January 28th, May 18th, June 4th; 

 Stage III. on September 8th, 14th, 24th, October 2nd, 8th, February 

 12th, 16th, 23rd, June 15th, August 19th, 23rd, December 3rd. The 

 species is rare. 



The Pupa. 



A larva in confinement pupated between September 22nd and 

 October 7th, a second between October 14th and November 2nd. 



The Adult. 



An adult reared from a pupa in confinement, October r2th; another 

 adult found in one of our rearing cages, August 16th. 



EPHOLCIS BILOBICEPS Foisin. 



The Larva. 



Thirty-five Stage III. larva were collected by following ploughs in 

 dark loam soils, September, 1914, and one in March, 1915; no others were 

 obtained. 



The Pupa. 



In confinement pup* were found on November 5th, 26th, and 30th. 



The Adult. 



An adult emerged in confinement on December 3rd, and a second 

 on December 16th. First taken at lights on January 26th, and from that 

 time until the end of March. Several beetles collected under bark of 

 Eucalyptus platyphylla in forest, 12th April. 



Part III. — Natural Enemies. 



A number of natural enemies of the various cane-grubs ar(> known, 

 and there are no doubt many more to be discovered. However, the sum- 

 total of the grubs destroyed is very small, as none of the parasitic or 

 predaceous enemies are at all plentiful. The natural enemies can be 

 divided into five groups as follows: — (1) The internal larval parasites, 

 comprising the various Diptera of the family Dexiidiv; (2) the external 

 larval parasites, comprising three species in the Hymen opterous family 

 Scoliidtc; (3) the predaceous Dipterous larvie of the family AsilidiL'; 

 (4) the predaceous Coleopterous larvtn of the family Elateridie, of which 

 one species only is known; (5) the internal adult parasites, comprising 

 one, perhaps two, species of Diptera. 



