THE RED SPIDER ON COTTOIST, 



49 



Several larv?e of tliis midge of various sizes were collected in the 

 field and reared to adult on mite eggs and mites. Table XVIII pre- 

 sents the data which bear on the larval period. 



Table XVIII. — Duration of the larval stage of Arthrocnodax Carolina, Bateshurg, S. C. 



Indlvidtial No. 



Larva col- 

 lected. 



Condition at collection. 



Pupated. 



Interval 

 from col- 

 lection to 

 pupation. 



Sept. 28, 1914 

 Oct. 7, 1914 



do 



Oct. 8, 1914 



do 



Oct. 10,1914 

 Oct. 11,1914 

 Oct. 13,1914 

 Oct. 21,1914 

 Oct. 26,1914 



do 



Oct. 27,1914 



One-half grown 



Small 



do 



NascentC?) 



Very smaU 



Large 



do 



T wo-thirds gro-wm . 



Nascent (?) 



Small 



Rather large 



Nascent (?) 



Oct. 1.. 

 Oct. 9. . 



do.. 



Oct. 13. 

 Oct. 11. 



do.. 



Oct. 12. 

 Oct. 14. 

 Oct. 26. 

 Oct. 29. 

 Oct. 28. 

 Nov. 1 . 



Days. 



Probable larval period, 5 days. 



From the foregoing records it may be seen that very small indi- 

 viduals completed their larval development in from three to five days. 

 Since several of these gave every evidence of bemg newly born at 

 the time of collection and had no appearance of having fed, it is evi- 

 dent that some of our records represent the entire larval period. 

 The larva (fig. 13, at left) is a small, glistening, amber-yellow grub 

 with a pointed, protractile head which bears a pair of retractile, 

 snail-like tentacles. A series of larvae measured: Length, 1.5 mm.; 

 width, 0.33 nrni. 



Table XIX includes the completed records on the duration of the 

 pupal stage which are available. 



Table XIX. — Duration of the pupal period of Arthrocnodax Carolina, Bateshurg, S. C. 



Indi- 

 vidual 

 No. 



Larva 

 pupated. 



Adult 

 issued. 



Pupal 

 period. 



1 Oct. 8. 



2 Oct. 10. 



3 Oct. 11. 



4 do 



.5 Oct. 12. 



do 



Oct. 15. 

 Oct. 18. 

 Oct. 19. 

 Oct. 20. 

 Oct. 21. 

 Oct. 20. 



Days. 

 7 

 8 

 8 

 9 

 9 

 8 



Average pupal period, 8.2 days. 



The data contained in Table XTX obtained from October rearings 

 indicate that the pupal period of this predator under summer condi- 

 tions does not exceed eight days, and at times may be a trifle less. 



