THE ANIMAL PARASITES OF CATTLE. 



525 



Fig. 12. — Short-nosed 

 blue louse iHwina- 

 topinus curyster- 

 nus) of cattle. 

 (From Bureau of 

 Entomology.) 



Fig. 13. — Long-nosed blue louse 

 (Hcematopinus vituli) of 

 cattle. . (From Bureau of 

 Entomology.) 



The blue lice (figs. 12 and 13) .suck the blood of cattle and are more 

 injurious than the red lice (fig. 14). Unless very abundant the latter 

 cause little injury. If 

 numerous they irritate 

 and Avorry their host 

 probably more by their 

 sharp claws than by 

 their bites, as their food 

 seems to consist entirely 

 of particles of hair and 

 dead skin. 



Cattle lice reproduce 

 by means of eggs ov nits 

 (fig. 15) which they 

 fasten to the hair. The 

 blue lice infest chiefly 

 the neck and shoulders; 

 red lice, when present, 

 may be found almost 

 anywhere on the body, but are usually most numerous on neck. 

 shoulders, and at the root of the tail. 



On account of tlie itching due to the lice, infested cattle rub against 



posts, trees, etc., and 

 lick themselves, the 

 hair sometimes com- 

 ing out and the skin 

 becoming thickened 

 so that mange may 

 be suspected. 



T r eat me at for 



lice. — Cattle infested 



# \/ "^ Avith lice should be 



^ f^' Pig. 15— Egg, of short- dipped ill the spring 



and again in the fall, 

 using a coal-tar or 

 tobacco dip, or Beau- 

 mont oil emulsion (see j). 505). The ar- 

 senical dip (see p. 504) is also another 

 remedy which may be effectively used 

 against lice. When possible a second dip- 

 ping should be given after the lapse of 10 to 

 14 days. The dips mentioned are, as a rule, 

 more efficacious against lice than lime-and- 

 sulphur dip. Though lime and sulphur is an excellent mange remedy 

 it is less satisfactory for lice, especially blue lice. If only a few cattle 



-? 



Fig. 14.— Red louse {Tricho- 

 dectCH scalaris) of cattle. 

 (From Bureau of Ento- 

 mology.) 



Fig. 15. — Egg, of short- 

 nosed blue louse (Hcema- 

 topinua cunjsternus) at- 

 tached to a hair. (From 

 Bureau of Entomology.) 



