‘THE CATTLE GRUBS OR OX WARBLES 49 
TABLE 3.—Number, size, and direction of travel of larve of Hypoderma lineatum 
in each of 10 divisions of gullets of cattle examined during each month at 
Dallas, Tex. : 
E: 2 |e 
im 
a ed Bd Sena wage 
= rs mB | o by Bs + [) S 2 3 3 
Sei isr len] ASS ets) ge aud Sale ge Dahle 
Se ley denies Clete op) NVA WIE eS qialS 
Number of larve headed toward pharynx and 
paunch in each of 10 divisions of the gullet 
from pharynx to paunch: 
First— ; 
Tver yaar eee ares ae SESS ON ee AUP SAT OS Ore oe Biles Ae Ole Os ei47 
Beater Late tena a eens race ae aint Ne a oh Oy) BH Ne oe a 4 6} 16 Ae Al Te Ola oo 
Second— 
TPN OYS EN 0G Be ee eR SONS 7 es ean es Oe Gia Oleic Sie 16 18) il TOR Ol O67, 
PEt asrn Les oe echo eae Ty es PAL = pe (0) BY os NSF ols) Tl eG lean lil Ole Oi 
Third— 
TE Ea ear ay Tae ea ene ge Coe 2 elle Ol a) SH ar Non ABs Ol Ose 7A 
BOUT Claes ee toes ta lee ye iy Ee OZ OD IS) ele IA Gh 2s Ole 97 
Fourth— 
| Dlakear Wp obee aie e BY Sepia Aeon See ey ea Dear Ole Oe Wil sOle 228 el 4 22h Ole id 
TBteyW tail ays teee tyes aaa ty ame Sn anol se ae Oo lees teen: Al 22) S02 el6leu 4) 22092 
Fifth— 
TRY ove Wey yeh comes tiene se RCI POSS Oo eee ee Oe 2 2 20 52529) 30 a a2 sO a0) 130 
Rane hiss cee aR Ooh aan eee Ol Chee OF 7-5 Sis 2oles Boie. LO mieo aS la tO tee 
Sixth— 
TENS chyi0b.4a 8 Sees Ree ras Sire Sete eae Ole Si Sie eesle sols > BOlac AN NO e220 OO 15 
TEPzU BD OG) Bes ape ae ae CoS ae Dak cee Dae eae eS alG lai Ale 20 aGla. WieO le 142 
Seventh— 
Hbv airy al ee es ed ROS epee nk Ta UE A ON Ne 24) ADI 39l2 222d Oh ah 
eV Cites Sater Eas a as Se aS ae le Pie On ORD) 4 AAG BA NO Qh ol aeemas Lod 
Highth— 
TPIS WEN ma bees prolate rey acne aH ee a ME ar AAG helene Clem ool) OUlee 2 sero) me 22 ie net Ol te 200 
AYU TG hs spe ee ee SON ei sole soll 291 50) tl P24 eee O | 206 
Ninth— 
TEA DEW Enna gb Cee TNC eT ee ety Soars aie ea Sie Sie LO 4 26) Ol Ate ll WOR elie Ole. 202 
JERD GANG) Oss ces oem hrs ee ieee a Pee ey re UES ele 82 Obie so2| a 2Ole sali ole 1Olee 220 
Tenth— 
ig oiraya xe te a epee SE Qe 2 Olen Dl e020) AS a4 9} 18 38] O| 154 
TEU BG TG EEG) ee Recent ieee: came ie Oh oeAlis weiss OA ier Bye lbs aKGye Sl Oe ake ah 
Total number of larve headed to- 
ward— 
PIN a Ty fees oe eS ec ee 10} 50) 40} 18) 179) 367) 295! 152) 183) 14] 0/1, 308 
IPA Chess tire ere a 8} 59} 28) 23) 144) 329] 337) 126) 175) 33) 1/1, 263 
Grand totale cess cee are 18] 109) 68] 41] 323} 696) 632) 278) 358) 47) 12,571 
Length of larvee (millimeters) : 
Thaby 90) DN Onligeee ene pao 2 Spam nea Eye ceapae ace 2. 6] 1.5) 3.4) (@) | 3.6) 3.8] 6.0) 6.0} 8.0} 9.6)12. 0)_____ 
NW Reepexeb TNT an eS a a fe or ie ac 4,9} 6.9} 5.2)____] 12.4) 14.0} 15. 5) 15. 9/16. 9/15. 8/12. O}_____ 
PAVELA CCN p BR See iy SNS ads ek \3. 98] 3.7) 4.4)____| 6.7] 7.4] 10.3] 11. 9/12. 9/13. 4/12. O)_____ 
Number of gullets examined__________________- 38} 119] 21) 8 380) 60} 29) 22) 46) 182) 146) 697 
Average number of larve per gullet ___________ 0. 55|0. 92 3. 24 5. a 7711. fue ee 64|7. 78)0. 26)0. 01) 3. €9 
| 
1 Larves not measured. 
By reference to Table 3 it will be seen that throughout the season 
the majority of the larve occurred in the paunch half (last five 
divisions) of the gullet, the percentage of the total number in this 
half being 67.87. It was hoped that some indication of the place 
of entrance into and exit from the gullet might be given by a study 
of the postion and direction of travel of the larve during different 
seasons but one can draw no definite conclusions from an analysis 
of the figures. During the first five months the number of larve 
heading toward the pharynx was greater than the number head- 
ing toward the paunch. This, together with the fact that 76 per 
cent of the larve present during the first 5 months of infestation 
were in the lower half of the gullet clearly indicates that the larve 
do not enter the gullet at the pharynx end. The evidence, however, 
98252 °—26—_4. 
