Ixodoidea. Ticks. 127 



Coxas I with 2 sharp spines : coxae II and IV with i tuberosity 

 each (female). Brazil. A. Parviscutatum. 



Coxae I with 2 blunt spines : coxae II and IV, with 2 tuberosi- 

 ties each (female). Guatemala. A. Sabanem. 



Eyes toward anterior third of scutum (female) . Bolivia. 



A. Vittatum. 



Coxal spines conical, strong (female). Banda Islds. 



A. Cordiferum. 



Punctations very fine (female). Siam. A. Sublaeve. 



Hypostome with 8 rows of denticles: scutum 17mm. broad. 

 Colombia. A. Diminutivum. 



Scutum pentagonal : punctations equal. Spain. A. Dubitatum, 



Hypostome with 8 rows of denticles : coxae III and IV one 

 tubercle each. Vite l/cvon Islds. A. Acuiangulatum. 



Scutum cordiform, 5.5 mm. broad : tarsi gradually narrowed. 

 Zanzibar. A. Aureum. 



Eyes toward anterior fourth of scutum. Africa. A. Devium. 



Scutum oval, punctations numerous on whole surface. Trinidad. 



A. Giganteum. 



Scutum lozenge-shaped, punctations rare in the middle 

 (Nymph). Trinidad. A. Avicola. 



Genus Hyalomma. 



Eyes present, occasionally hemispherical, brilliant, in a sub- 

 marginal orbit of the scutum ; or flat, scarcely salient. Capitulum 

 long, palpi valvate. Anal groove semi-circular, opening forward, 

 uniting the sexual grooves, and followed by a median ano-mar- 

 ginal groove. Body elongate oval. Color more or less deep 

 brown. Male : two pairs ventral shields, adanal and lateral : 

 often two accessory shields behind the latter. Scutum festooned 

 posteriorly. Tarsi with spines. Female : Stigmata triangular. 

 Larva and nympha festooned posteriorly. 



KEY TO SPECIES OP GENUS HYALOMMA. 



Eyes flat : coxae I not incised : numerous equal scutal puncta- 

 tions : median border adanal shield longer than posterior one. 



H. Crassitarsus . 



Numerous unequal scutal punctations : median border adanal 

 shield longer than posterior one. H. ^gyptium. 



Few, equal scutal punctations : median border adanal shield 

 shorter than posterior one. H. Affine. 



