50 BULLETIN 1369, U. S. DEPARTMENT OF AGRICULTURE 
is not clear that the larve enter or leave the gullet tissue at the 
paunch end. It is possible that some of them reach the connective 
tissue by penetrating the muscle along the sides of the gullet. The 
writers’ observations indicate that there is considerable variation 
in the size of the larvee at the time they reach the gullet, and that 
the larvee continue to reach the gullet over a much longer period 
than is covered by the entrance of the larve into the host. 
TABLE 4.—Number, size, and direction of travel of larve of Hypoderma lineatum 
in each of 10 divisions of gullets of cattle examined during each month in 
New York State. 
[| 5 |e | | 
co) o| 8 > 
2(#/8/]elelel| 41. | | 
y = Ss = 
ae gle/B/e8/8/2/81/8|2 |e lElzi2 
= : 
Sls|<|a/o|z2}als/ale aisle 
= OS | se | | Ss | | | 
Number of larve headed toward pharynx | | 
and paunch in each of 10 divisions of | 
the gullet from pharynx to paunch: Es 
First pharynx _____- EES aR as FLAS tee Ol Ole 61 Ole 2 0) 2| li @- of OF 13 
IESE ANTIOCH = Sec ep oe eer eee | O} Ol. > ab 0) a Ot eee se 
Second -phtary Bit = ea ee 0} Ole 5) oto 0 3} 1 3} ~ GO| 0: 16 
Second: paunch=++ 2522S ee ee 0} 0] 5} O TE OlseSh eseok 2 1S co OP 11 
PRHIEGEpNAL ya Vee ee eee ee ee qo. 0} 68 1 6) Of 62 3 0} Of =O) 15 
Thirdspausch S- 12 es. SS ee eS of. o} 4 1 3} Oo oY Of 6 ho CoO C8 
‘Rourth pharynxe > 26 ea === 0s 0 2). - 3) <2) 0) 22) A) 2 Al SaaS cee ee 
Heurth pancho. ese ee 0} 0) 4 ot a0} 22) 5) = 6 Oana 6 
Hut hepharynxse se ao eS Ole OF SS ae eel ae 2| 1} Oo} OF 33 
Pith pauneh. =. ee SE Pe S20). S/S 6) na 14 aes 5 Oo} 0} OF 35 
Gix (huplaryaix 22 es ae ee OS Sal Ole -4lS 7) a6 71 2 OF OG} 40 
Sixth paguch 2o 25 325 55 Ss Oj. -0| 11] 3] 25] of 4} 7 8| 3 a OF 60 
Seventh pharynx. ____..-_____-_.-___-_- } Oo oF 8 14) is} of 21 12} 9 | of OF 65 
Seventh paunch_.......___.-_..______ |} of of 8 6 29] -0| <3| 4b Si at ee ad 
Pishth. pharyns oh: Ore eee 0} 0} = 16) 41 -- 19-0) 2) 7) = 5) = Se 78 
Highth-panuchS = == se o|- oO} 11) 10 -37/- O}- 1) 9| G6 2 Oo - O 7% 
Ninth pharynx: - ==) =. 222-2 == O|- 1} 15] 141 221 of Oo] co) 14) 4 0) 0 87 
INimth pannchs=" 232 se ee Q} 2] ‘17] ~=8} 481 «O}) 1} 15] «1h = 2} -- oF Oo 104 
Tenth pharynx: = 620 eo. ee ee O| 2] 14t 7-23] 0}. - 0} 19] 1-0 OF 7 
Montavpaunch <0 = ono 2 Ge ee Soke Oo} 1) 141 5 46]-.0; -1| 25 9} 4 0} 0; Jo2 
Total number of larve headed toward— hese | | aaaeS 
Phar ynks 2028s Ss se ee i 0} 4} 70; 61; 133] 0} 13] 91) 55] 13; Oj} @| 440 
Paonehe 22:8: 0s: eS oe Se eS _| O| 8] 84) 42) 203]. 0) 17; 71) 55; 11) 0} 0} 486 
Deebiint ee o}- oO -7 1] OF 1; 3} 2} 8 3 25 
Grand: totals 23s Ne | O} 7|-161| 104; 336] 1) 23) 164; 118} 27; 0} 0} 951 
Length of larve (millimeters): | | es | 
ininGine = te a Se a eS | 3.5] 3.01 3.0) 4.0! 5.0: 7.3] 6.5! 8.7) 10. 0)-22-2 Bs 
I Miccbna paige ee es ies Se) a ee ae | 4.0} 6.0} 7.3) 8.0] 5.011. 1/14. 7] 14.9) 15.6)--__|-__ Pes 
PAC VET AT Or shat pment age ee ee (3. 82.4: 62-5. 52; .6. 08} 5. 5\8. 69/9. 97/12. 13)13. 65)____|____ eee 
Number of gullets examined________________ | 15) 61) 68} 28) 25] 15) 2i| 27| 72; &8| 5) 15} 440 
Average number of larve per gullet___-____-_ : 0} : we eos 71,13. 44) . 67 1. 516. 07; 1.64; .31) 0 oF 16 
| | 
Table 4 presents some of the data obtained during the examina- 
tion of gullets in several localities in New York. Most of them 
were taken from cattle kept in the vicinity of Ithaca, Chester, 
Albany, and Buifalo. The combining of the records obtained in 
several different localities makes the figures more irregular than 
those obtained at Dallas. The figures show that about 77 per cent 
of the larva: were found in the posterior half of the gullet. It will 
be noted that there is considerable irregularity in the average 
number of larve per gullet, there being a marked decline in the 
number in November and December, where it seems almost cer- 
tain from analogy that the maximum should have occurred. The 
low average in these two months can be explained by the fact that 
the gullets were taken from a very few lots and were probably 
from a very small number of herds of cattle. It is well known 
that the extent of infestation varies in different herds. 
