470 



BUREAU OF ANIMAL INDUSTRY. 



broad as long; ventral surface naked, sexual grooves very divergent caudad, anal 

 groove semicircular or ogival, opening in front, uniting the sexual grooves; ano- 

 marginal grooves single. Scutum covering entire dorsal surface and usually marked 

 with metallic green spots. Stigmata comma-shaped. Female with scutum shorter 

 than broad or scarcely longer than broad, usually marked with three metallic green 

 spots arranged in a triangle. Ventral grooves as in male. Stigmata shorter, less 

 attenuate at postero-lateral extremity. 

 Type species. — Aponomma Gervaisi. 



The members of this genus live almost exclusively on reptiles. None 

 of the forms thus far reported appear to be North American. Neu- 

 mann gives the following ke}^ to the species: 



Key to the Species of the Genus Aponomma. 



Males 1 



Females 8 



A. — Male. 



1. Scutum marked with green metallic spots 2 



Scutum not marked with green metallic spots 3 



2. Said spots fire in number A. Gervaisi. 



Said spots nine in number ' A. exornatum. 



3. Scutum without deep marginal groove 4 



Scutum with deep marginal groove 6 



4. Scutum channeled by fossettes; body broader than long A. transversale. 



Scutum level; body as long as broad or longer 5 



5. Tarsi II to IV narroived at the extremity A. Isere. 



Tarsi II to IV provided with tuberosity at extremity A. politum. 



6. Scutum marked with lighter spots. A. decorosum. 



Scutum of uniform color, reddish brown 7 



7. Tarsi II to IV, narrov^ed at extremity A. trachysauri. 



Tarsi II to IV, with tuberosity at extremity A. concolor. 



B. — Female. 



8. Scutum marked tvith three metallic green spots 9 



Scutum reddish brown, of uniform color, without green spots 11 



9. Scutum at least as broad as long, punctations large, not close together A. Gervaisi. 



Scutum as long as broad, or longer, ^mnctations fine, close 10 



10. Tarsi calcarate A. exornatum. 



Tarsi not calcarate A. trimaculatum. 



11. Body much broader than long A. transversale. 



Body longer than broad 12 



12. Scutum broader thayi long 13 



Scutum as long as broad, triangidar 14 



13. Scutum with few fine punctations A. Iseve. 



Scutum with numerous deep punctations A. trachysauri. 



14. Tarsi three times as long as broad A. decorosum. 



Tarsi at least four times as long as broad A. hydrosauri. 



Genus Amblyomma^ Koch, 1844. 



Generic diagnosis. — Ixodinse: Eyes usually flat, slightly salient, sometimes hem- 

 ispherical, brilliant, in a submarginal depression of the scutum. Capitulum long, 



Synonymy and Bibliography. 



1844: Amblyomma Koch, 1844, pp. 223-231.— Idem, 1847, pp. 15-20.— FtiRSTENBERG, 

 1861, p. 208.— Murray, 1877, pp. 187, 188, 201-203.— Bertkau, 1880, pp. 



