40 



BULLETIN 416, U. S. DEPARTMEN'T OF AGEICULTUKE. 



32.56 mites. The predatory capacity of the first instar is not known^ 

 since we have never reared individuals from the egg. The second 

 nymphal instar consumes on an average 80.5 mites, the third instar 

 consumes 112, and the fourth averages 146 between molts. The 

 average duration of the second instar is found to be 3.22 days, that 

 of the third instar 2.66 days, and the fourth instar requires 4.36 days. 

 The maximum recorded consumption for one day was 68 adult mites. 

 Moulton states that in California the life cycle of T. insidiosus re- 

 quires only 15 days, but the foregoing data would indicate that in 

 the Southeast a little longer period is required. 



Table VIII.- 



-Predatory activity and development of Triphleps insidiosus, Batesburg, 

 S. C. 



Indi- 



Feeding 

 days. 



Stage of predator. 



Mites 

 con- 

 sumed. 



Total 

 con- 

 sump- 

 tion. 





vidual 

 No. 



Nymph. 



Adult. 



Remarks. 





f 1 

 2 

 3 

 4 

 5 

 1 

 2 

 3 

 4 

 5 

 6 

 1 

 2 

 3 

 4 

 5 

 6 

 1 

 2 

 3 

 4 

 5 

 6 

 7 

 f 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 1 

 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 



X 



X 

 X 





43 

 56 

 30 

 24 

 23 

 25 

 39 

 29 

 28 

 15 

 31 

 24 

 33 

 20 

 24 

 19 

 24 

 22 

 31 

 34 

 12 

 42 

 12 

 26 

 17 

 7 

 25 

 32 

 47 

 34 

 55 

 18 

 29 

 33 

 57 

 13 

 36 

 16 

 60 

 38 

 43 

 68 

 63 

 39 

 37 

 25 

 17 

 33 

 28 

 18 

 35 

 28 

 62 

 43 

 34 

 59 

 41 



176 

 167 



144 

 179 



297 

 57 



438 

 398 











1 





/Collected as young nymph; molted after 3 

 \ days to adult. 





X 

 X 











X 

 X 

 X 

 X 



X 



X 

 X 

 X 

 X 

 X 















(■Collected as nymph; molted after 5 days 

 \ to adult. 



2 











X 

















3 





Do. 











X 







X 

 X 

 X 

 X 

 X 

 X 

















4 





f Collected as nymph; molted after 6 days 

 \ to adult. 















X 







X 

 X 

 X 

 X 

 X 

 X 

 X 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 





















(■Collected as very young nymph in bs- 

 1 ginning of 2d instar; molted on 4th day; 

 1 molted on 7th day; molted on 11th day 







5 



























6 





Nymph escaped. 





























(Very small nymph at collection; molted 

 < on 4th day; molted on 6th day; molted 

 [ on 10th day to adult. 



7 





















X 

 X 













X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



























[Collected as very yoimg nymph, possibly 

 < molted once; molted on 4th day; molted 

 \ on 7th day; molted on 10th day. . 



8 



























X 











Total... 



57 



49 



s 





1,856 











