BROAD-NOSED GRAIN WEEVIL. 5 
TABLE 2.—Rate of oviposition of Caulophilus latinasus.' 
Number of eggs laid Number of eggs laid 
Temperature. fa ayaa Temperature. by weevil No.— 
DAC en mama tae eal |e | eee | Date: 
Max.|Min. |Mean,) 1/2|3/4/5|6| 7 Max./Min.|Mean.| 1 | 2/3/4/]5|6]| 7 
2A) ee | cee | nee Lae 1920. ae ed Wear Heft 
Aug. 10}; 94} 70) 82 HE UNSAe|scllocaliaac Seth | MN Ojon dieie |e On) | OAero utile te Sf bale al 1 
1 Dba e018 200 hy Oh )ieec lesen Seri) DGCa. Uaniewnbnl 8)| 64.5) 1). =| noes ea eden ea 
: 19} 95] 69} 82 7A I US Corll. 3 ae ZN eeOn | 405 55.25 0 ON sel] Oh ak) Go) 
20 | 95 | 69 | 82 PAW UL ae |) Me aeleee aS oon OSsen plate -| 2) 2/1 1 
PAD || SECON CCE SEES Nae S| Me 8| 72| 58] 65 Pale | 2/2/1] 2 
Piglet me OOn Olean la| Queda Poles 13 | 84] 55} 69.5 | 3}. alla oie oak 
Oph 25) 0 1699 79. a0 L211) oe) eee LADS ZONA OKs} OL 2 aeis| 2 le 2) 50 
92) 70} 81 P| PAN 24 | PA | ab ta i 70) 36) 53 Diisosiees 1, Oa ow 
11 | 96] 72 84 AN Ue ON Z ils |e 19) 75} 37 | 56 Wo asalecs 0|0/;0! 0 
AZ 9Su | G9) | Steo0 2) | 22 | Loi 26} 78| 44| 61 oer [eee ys es else (aoe 
17| 89} 67 | 78 ye) Ik NET Nd iil} a Ol es 2 84 68 | 76 TS es Bes Lh} 3) 4] 2 
18 | 92} 68} 80 Sy stalk i eles 1921 
24] 84) 70] 77 Ceca PAW Nese Jan. 1] 84] 44] 64 Ulleoa|laee 2a ea 2 
PA5s Utes) |) ZO BY Ee i AW SW C4 Oi Wes aoe PAN Sa Uae 
Oe Ts a A OG ale ae Peak abicce Ul) Ges GS) Obes | Me esligne On ee ON el 
2] 82) 48 | 65 I) a Oy HO) Heo Soi 79) S365 Od lees| (se Oe a Ns @ 
8 | 80) 50} 65 OO et Oa Wve 13 | 78) 48 | 63 Sees Be AS ees | eal sO 
9] 84) 521 68 DL OP LOW O tee TE 7) OE ie) Wisselions Day Il fy abs |e aL 
15) 88"j> 625) 75 OF OF 1a. Os) 00/22 Mala 9) | or4651662..5.| 0 |. 2.18 3: Ze lel Oni 
16 | 88| 60 | 74 0/0/1/0)/0)(4)|@ 19.| 73 | 53°) 63 Ue 3 fO Oay eal 
ZO St 64) 7osonanes | Le 2S eel 23 | 83} 950 | 66.5) 1 |.. bea yee IU je at 
27 | 88] 66 | 77 2/2 )()) 2) 2) 1)-1 24; 81} 49 | 65 Wale Alpes eo | el ca ea 
BN OVAEIN S4.) 597 isos tek) 22 (do) ONOs Or Reb. wmeS4. a0 64. 1 C2) eee (0),| el |) 0 1) 0 
ZaSOe mot atioo uaa ieee 2: | OF) OnuO Aap S2) 44 (Odea ee ne SEO) OR Olena 
7} 85) 60 | 72.5 | 1 a2 OMOn et 7| 84] 58] 71 salle 4 eatin oa 
8| 86] 60} 73 2 | 2 Oo Oy al 8| 84] 52] 68 Sf) AE24 | ib 2 
LENS od 1 6fon [20 ie Jib Za Oi a 13 | 74| 38 | 56 WOO yO ta 
LON Zon lenGa|oscon| ROL |e On ONO 14} 74) 40°] 57 OW OO 3G 
20/} 81) 52) 66.5] 1 |}. a 2 2a) Oy) @ OH Veter eer aya ait 3 SS (8)} (8)| (9)} 2 
21) 83| 54] 68.5] 0}. edb at Ly a ZBL SO GB GO Noesiosallsealloae se Peete onal! 
A8ie6760|. 581) 67 a0 |: ETB ESSA [LT LP AR Ua) tae aA ihc | I = [ea eas) 
' | 
_1 The mean temperature of the crib in which these records were made is about 3° to 4° F. higher than 
the outdoor temperature quoted in this table. 
2 Emerged Aug. 7, 1920. 5 Died Nov. 2, 1920. 8 Died Feb. 16, 1921. 
3 Emerged Aug. 9, 1920. _ 6 Died Nov. 4, 1920. 9-Died Feb. 19, 1921. 
4 Emerged Oct. 12, 1920. 7 Died Feb. 1, 1920. lo Still alive. 
EGG STAGE. 
During the summer months, with the temperature ranging from 
65° to 99° F., with a mean of 81°, the egg hatches in four days. As 
the weather gets colder the incubation period gradually lengthens 
until, in the coldest winter months, with the temperature ranging 
from 34° to 88° F., with a mean of 62°, from 10 to 14 days is the 
normal length of the period. 
LARVAL PERIOD. 
When the egg is placed in the germ or in the starch of the kernel 
the young grub, breaking through the bottom of the shell, finds a 
plentiful supply of food. Development of the grub is most rapid 
when it is located in the germ. Progress is a little slower in the 
seft starch, while development in the tough horny endosperm is 
very slow and the larval period is greatly prolonged. 
NUMBER OF LARVAL STAGES. 
There are three larval stages. The first two are about equal in 
jength, while the third is slightly longer. Table 3 gives data showing 
the variation in the length of these stages at different times of the year 
103755—22—Bull. 1085———2 
