74. WHITE FLIES INJURIOUS TO CITRUS IN FLORIDA. 
shows that as many as 14, 19, 27, or even 33 eggs may be deposited 
by a single female in one day. It will also be noted that much 
variation exists between the number of eggs deposited by several 
different females on the same day. and by the same female on suc- 
cessive days without any apparent reason, and that there exists no 
appreciable difference between the rate of deposition by virgin and 
by fertilized females. 
TasLte XIII.—Number of eggs deposited by single females of the citrus white fly. 

Daily rate of oviposition by individual females. 
Fly, Date of first Condition of female. = TT oe ST a Sr 




























No.) daily record. | 
1 2 3 4 5 6) ov 8 | 9 | 10) d1 | 12 
| | | 
paste Wr ke eS Se |\— pee 
1 | Aug. 8, 1907..| 9+-males 12 hours old.........| 8|19 | 9 | 22|11} 2 | LS SO ilaee eee eee 
7) | Roe (0 Ko eae eed Pees (0 Io pe Se eee on ee ae 5.) 19.) 14) eS So) 4S CN st ee eee 
2 Geer dossaee acces COse bis oh ese enone Sees 3 9 | 13 5 | 13 9 | 16 8 1S (ees al) 14 
Asa) Satya elo Ree as 8 Wirgin li 2anours oldjseeeas- ee. Lay ela ias 7 4} 3] 20 5 1 Ob eroaiecs: 6 
5 | Aug. 15,1907.| Virgin 8 hours old......-.----- 5S) Sr 4 a2 24) 505) ASS Eas con aS 9 
Gyossee Oe ss eel eee (6 0 = a te ene teenie 6) 16.) 27 94] 334|) 134) 237) 16 ton eae 3 
IBA Teas Bee @ +males 8 hours old. ......-.- 8 | 8] 16 | 44 117) Ot.) 16 | eal aera eres 
8 | oes MOS sese|see=8 Ob nese ence eee 2) 1 185) 16/14 995)) 921) 183) 5a Gon eS 1 
| | 
| i 
Daily rate of oviposition by individual females A verag 
Fly | ; ; : Total . Number eres 
i ehd SE ai ae = number of | of days eggs per 
13 | 14] 15|16|17|18|19] 20 | 2 | 22 | 23 | aq. )| eeeslald-» |. plived— sarang 
ale ‘ | - 
92 8 11.5 
104 8 | 13 
206 22 9.4 
112 19 6.0 
179 16 11.2 
211 17 12. 4 
146 17 8.6 
144 14 10.3 
1 Dead. 4 Dead; 11 eggs in abdomen. 
2 Dead; 13 eggs in abdomen. 5 Dead; 7 eggs in abdomen. 
3 Dead; 18 eggs in abdomen. 
Number of eggs per day per female, grand average, 10. 3. 
The eight records in Table XIII are selected from about forty 
similar records on file and are considered as representing an average 
condition of oviposition. Although the general average of 10.3 eggs 
per day throughout life for the 8 females recorded in Table XIII 
agrees very closely with the similar average obtained in Table XII, 
there is sufficient evidence in the data in Table XIII to warrant 
the statement that the daily rate of oviposition for individual females 
is usually greater during the early part of the insect’s life and de- 
creases with each successive week of existence. Leaving out of con- 
sideration the first day, when the flies had not reached their normal 
egg-laying capacity, a little calculation shows that the average daily 
deposition for the three successive weeks is 12.8, 8.5, and 6.1, respec- 
tively. This same decrease in the number of eggs deposited with 
increase in age is perhaps better brought out by a study of the number 
of eggs deposited by the individual females over 5-day periods. 
Thus No. 6 averaged 16.2 eggs per day for the first 10 days, but for 
