AMBLYOMMA AMERICANUM 619 



55. Scutum with sub-equal and distant punctations, with extensive 



clear patches . . . . .* . . striatum . 



Scutum with very unequal punctations, confluent in places, 



markings restricted . . . . ''. . . . varium. 



56. Coxa I with very long spur; scutum longer than broad . . maculatum. 

 Coxa I with one spine as broad as long ; scutum broader than 



long . ' , . latiscutatum. 



(East Indies.) 



57. Tarsi gradually attenuated ; scutum with postero-lateral bor- 



ders concave . . . . . . . . parvitarsum. 



Tarsi abruptly terminating ; scutum with postero-lateral bor- 

 ders straight or convex .......... 58 



58. Scutum triangular, dark brown, with or without posterior spot variegatum. 

 Scutum heart-shaped, yellow with brown markings . . . sylvaticum. 



Amblyomnia cajennense, Fabr. Male. (Plate LXXIX, fig. 1) Scutum 

 reddish brown with yellowish white patches, most of which are longitu- 

 dinal ; punctations of medium size and absent from the scapulae. Coxa I 

 has two short unequal conical spurs, the external the longest. Coxa 

 IV with a spur a's long as the coxa. Hypostome with six rows of teeth. 

 Length 4*9 mm ; width 3 mm. (Neumann) 



Female. (Fig 2.) Scutum triangular, a little broader than long ; 

 eyes situated towards the anterior fourth of length of scutum ; numerous 

 small and equal punctations. Coxa IV has a small pointed tuberosity. 

 Length 5'5 to 14 mm ; width 3 to 11 mm. (Neumann) 



This species is found in Mexico, Yucatan, Guatemala, Central America, 

 Honduras, Nicaragua, Costa Rico, Cuba, Jamaica, Trinity, Panama, 

 Columbia, Venezuela, Guiana, Brazil, Paraguay and the Argentine 

 Republic ; it is parasitic on cattle, the horse and dog, and sometimes 

 attacks man. 



Amblyomma americamtm, L. Male. Scutum reddish brown with 

 yellowish white markings and numerous equal fine punctations ; eyes flat. 

 Coxa I has two short conical spurs, the external much longer than 

 the internal. Hypostome with six rows of teeth. The marginal groove 

 limits the festoons anteriorly. Capitulum long ; basis capituli short. 

 Coxa IV with a spur nearly as long as the coxa. Length 3 mm. ; width 

 2*5 mm. (Neumann) 



Female. Scutum triangular, nearly as broad as long, with a spot 

 in the posterior angle ; eyes situated towards the anterior third of length 

 of scutum. Coxa IV with a very short spur. Length 4*5 to 12 mm. ; 

 width 3 to 8 mm. (Neumann) 



This species is the common cattle tick of the United States, where it is 

 known as the ' Lone Star Tick '; it also occurs in Guatemala, Guiana and 

 Brazil. 



