mre 
At Galesburg, Ill., where 50 head of horses were slaughtered and 
examined for bots (Gastrophilus spp.), while "not one stomach was entirely 
free of bots and many were heavily infested," G. intestinalis De G. 
predominating, no larvae were found in the pharynx and no lesions in the 
skin of the jaw and the underlying tissues, although, according to R. W. 
Wells, in charge of the work, "some of these hosts had moderate infesta— 
tions of eggs(of G. nasalis L.) * * * on the hair of the jaw. The absence 
of any lesions supports our theory and supplements our evidence reported 
last month that the larvae of this species, upon hatching, migrate down 
the hair and skin to the mouth and make their entry through the mouth. 
We now believe that these larvae never penetrate the skin of the host, as 
has been considered one of the possible methods of ingress." 

0. G. Babcock, reporting on control of goat lice at Sonora, Tex., 
says that, "as rotenone is proving to be an effective dip against goat 
lice, a 76=pound goat was fed 3.57 grams hourly until 17.85 grams was 
given, in capsules." No injurious effects were observed in the animal 
tested except that it "went off feed for a few days immediately following 
treatment." Mr. Babcock states that a ranch "flock of scrub goats had a 
heavy infestation of red lice. Three hundred and fifty—nine goats were 
dipped in 300 mesh sulphur 105 days ago. Each goat was held in the vat 
for three minutes, and the temperature of dip ranged from 100° to 105° F. 
Final examination showed the goats to be 100 per cent free of lice, ani- 
mals in excellent condition, mohair clean, locks curly, no matting or 
tangles whatever, and no goats were observed scratching, biting, or horn= 
ing themselves." On another ranch a "flock of lousy goats, that were 
heavily infested with the blue or sucking louse, and the red or biting 
louse, were dipped in gas sulphur dust on June 16, 1930. On August 29, 
1931, * * * these goats were found to be free of lice. After three suc-— 
cessive shearings after dipping, with the exception of one billy which 
was in another pasture by itself, all the goats were free of lice. * * * 
This is a most remarkable record for the reason that this ranch is sur- 
rounded by infested goats on all sides." In an experiment at Menard, 
Tex., five ranchmen participated. Mr. Babcock says: "The total number 
of goats dipped with 300 mesh pure sulphur plus the soap was 2,449 head. 
Two months following dipping the goats were carefully examined during 
shearing * * * and not a single louse was found." In another experiment 
goats were dipped in a mineral oil-soap solution "at dilutions of 1 to 
15, 1 to 50, and'1 to 45. It required a rather strong dip, .1 tovlGeeeee 
kill all the lice. The dilutions of 1 to 30 and 1 to 45 killed justea 
few of the lice. Very little staining of the mohair was observed." 
Studies on blowfly parasites and predators at Uvalde, Tex., are 
Summarized by D. C. Parman as follows: "Predators were less generally 
distributed in New Mexico areas than in Arizona except in the mountain 
timbered area east of Albuquerque. Predators were present in 103 of the 
total of 117 jars collected in Arizona, and excluding the mountain for-— 
ests only 8 of 39 jars exposed in New Mexico had predators. The larval 
parasite Xyalosema is indicated to be well distributed in Arizona. It is 
possible that parasites and predators exert a considerable control of 
blowflies in Arizona and may account for the screw worm being less of a 
pest in these areas than at other places. At present we have not been 
able to account for this by climatic or other ecological factors. This 
indicates that this may be a fruitful field for study." 

