BIOLOGY OF PHILIPPINE CULICID^. 237 



The larva of Worcesteria grata Banks is purely carnivorous, but I have 

 never noted an instance in which it was cannibalistic. Three lai-vas, 

 nearly full grown, were placed in a 2-liter glass jar for two days without 

 food, and during that time none of them attacked the others, although 

 as soon as larvje of Desvoidya joloensis Ludlow were put in, they were 

 attacked by the W orcesteria larvje. 



The number of larvee of different kinds devoured by one of Worcesteria 

 grata Banks during its period of growth is quite astonishing. The re- 

 cord for three larvae is given herewith : 



Fifty eggs laid July 12, 1906. LarviE hatched July 16, and all died except 

 four. About four hundred larvae of Culex fatigans Wied., which hatched the same 

 day, were fed to the Worcesteria larvae on July 16, in addition to three half-grown 

 Giilex larvae already in the jar. 



Five half-grown larvae of Stegomyia persistans Banks were fed to them on 

 July 17, and tea full-gi-own larvae of the same species during the afternoon of 

 July 17. The first molt of the Worcesteria larvae occurred during the night of 

 July 17, and during the day of July 18 they almost doubled in size. On the 

 18th day of July, in the night, one larva died from an unknown cause. 



Twenty-five full-grown Stegomyia larvte were fed on July 18. The second 

 molt occurred during the night of July 19. On July 20, twenty full-grown 

 Stegomyia larvae were fed. The third molt occurred at noon of July 21. Fifteen 

 full-grown Guleoo fatigaiis Wied. larvae were fed on July 22 and fifteen more on 

 July 24. On July 24 the Worcesteria larvae appeared to be about full-grown. 

 On this date four full-grown Stegomyia larvsE were fed, and twenty more were 

 given on July 25. One larva pupated on July 26 during the early morning, 

 and another later on the same day. The remaining larvae ate nine Stegomyia 

 larva; and pupated at 5 p. m. on July 29. 



Two adults emerged during the early morning of August 1, and the remaining 

 adult on August 3. These were all females, and were from eggs which were laid 

 by a single female which emerged in Iloilo on July 6 in company with a number 

 of males taken from material which I had brought from Mailum in the town of 

 Bago, Negros Occidental. 



During my stay in Negros, I. was unable to obtain eggs of this species 

 for rearing. However, the larvse were captured in considerable numbers 

 and the following notes as to their growth are given herewith : 



May 26 : A nearly full-grown larva captured. This was the first of this species 

 and was taken in a bamboo joint associated with numbers of Desvoidya joloensis 

 Ludl., but on June 7 it died. 



June 7: Four nearly full-grown larvie taken, each from a different bamboo 

 joint. The water in these cups was perfectly clear and clean and contained larvae 

 of Stegomyia samarensis Ludl. 



June 12: One larva pupated. 



June 14 : A second larva pupated. 



June 17, 7.30 p. m. : The pupa from the larva of June 12 changed to an adult 

 female. 



June 19, 11.40 a. m.: An adult emerged from the pupa of June 14. 



June 20 : Eight larvse were found in the liquid in the top of a bamboo ladder 

 at the front door of a native's house. There were numerous other larvae of Culex 

 sp. and maggots of some other unidentified dipteron. The liquid was composed 

 of rain water and urine voided into the receptacle by the children of the house, 



