124 Veterinary Medicine. 



Tarsi at least 4 times as long as broad (female) . 



A. Hydrosauri. 

 Tarsi without spurs (female). A. Trimaculatum. 



Genus Amblyomma. 



Eyes usually flat, slightly salient, sometimes hemispherical, 

 brilliant, in a submarginal depression of the scutum. Capitulum 

 long, with valvate palpi. Anal groove semi-circular, opening in 

 front, uniting the sexual grooves : usually no median ano-mar- 

 ginal groove. Scutum often marked with color designs. No 

 anal plates in male. Stigmata usually triangular, with rounded 

 angles. Nearly always eleven posterior marginal festoons, 

 especially in male. 



KEY TO SPECIES OF GENUS AMELYOMMA. 



Punctations over whole scutum (male); Coxae I with one very 

 long spine. N. America, Md., Tex. A. Americanum. 



Punctations lacking from triangular scutal projections, flat, 

 radiating posteriorly (male). Mexico, CI. and S. America. 



A. Cajennense. 

 Hypostome with 8 rows of denticles (male). N. America. 



A. MuUipunctum. 

 Hypostome with 8 rows of denticles (male). Nicaragua. 



A. Crassipunciutum. 

 Hypostome with 6 rows of denticles (male) : large median 

 scutal spot, 2d palpal article 3 times as long as 3d. S. America. 



A. Calcaratum. 

 Hypostome with six rows of denticles (male). S. America. 



A. Varium. 

 Spine of coxae IV long and .strong ; body broad (male). 

 Mexico. A. Ccelebs. 



Spines of coxae I very long (male). CI. and S. America. 



A. Fossum. 



Spines on coxae I very short, tuberous (male). III and IV with 



one tubercle each (female). CI. and S. America. A. Scutatum. 



Second palpal article 1% times as long as broad (male), twice 



as long as third (female). Scutum without large median spot. 



CI. and S. America. A. Nodosum. 



Punctation on scutal scapular angles large, about 10, (male). 



Mexico, CI. and S. America. A. Sparsum. 



