138 Veterinary Medicine. 



porcupines, cats, men, birds, etc. Like I. Ricinus it is alleged to 

 be generally harmless 3'et in large numbers it must be relatively 

 injurious, and may become the bearer and inoculator of infections. 



AMBLYOMMA. 



General characters: A. Americana: Scutum reddish brown, with white 

 or metallic green spot in posterior angle ; 11 post, festoons. Distribution : 

 N. and S. America. Hosts : Cattle, sheep, other animals, man. Ticks of 

 uncertain genera : I. Scapulatus ; I. Marmorata ; I. Erinaceous ; I. Margi- 

 nata ; I. Chelifer ; I. Camelinus ; I. Rugica ; I. Rotundus. Destruction of 

 ticks : I/ighter mineral oils ; oils of turpentine or tar ; bland oils ; hot knife- 

 blade or wire ; oil baths ; remove brush and stock ; rotation of crops ; divide 

 pasture in two and pasture each in alternate years. Exclude wild animals. 



These have eyes flat, or slightly salient, brilliant, sometimes 

 hemispherical, in a submarginal depression of the dorsal shield. 

 Anal groove semi-circular, opening forward, .sexual grooves unite 

 at this point. Median ano-marginal groove rare. No anal plates 

 in the male. Dorsal shield often marked with designs in color. 

 Stigmata usually triangular with rounded angles. Nearly always 

 I r posterior marginal festoons. 



Amblyomma Americanum. Lone Star Tick. /. Ameri- 

 canus. Young Female. Body oval, longer than male (4.5 mm. 

 long by 3 mm. broad). Dorsal shield triangular in its posterior 

 two-thirds, posterior angle open and rounded ; reddish brown 

 with a white or metallic greenish yellow spot in the posterior 

 angle giving name to the species. Cervical grooves deep an- 

 teriorly, shallow and open behind ; punctations numerous, small, 

 equal, regularly distributed. Eyes nearly marginal, toward an- 

 terior third, large, flat, yellow to white. Eleven posterior mar- 

 ginal festoons limited in front by a deep groove. Surface rough, 

 puckered, shagreened. Hairs sparse and fine. Genital pore 

 median between legs I to II. Stigmata whitish, broad, triangular, 

 finely punctate, pore small on elongated ridge. Head (capitulum) 

 I.I to 1.5 mm. long, base longer than in the male, and shows 

 porous areas. Palpi straight, second article relatively long. 

 Legs long and thin with long hairs ; spine of coxse IV very short, 

 scale-like ; tarsi long (I more than four times, IV four times as 

 long as broad). 



Ovigerous Female may be 12 mm. long by 8 mm. broad. 



