Explanation of Terms. xi 



Sy?topsts. — A tabulated arrangement showing at a glance the distinctive 



characters of the several families, genera, or species under consideration. 

 Tarsus. — The terminal joints of the leg, succeeding the 'tibia.' {PL \\./ii(. 6, e.) 

 Tarsal. — Belonging to the ' tarsus.' 

 Test.— The secretionary covering of various Coccida? ; especially such as are 



of a waxy, horny, or glassy consistence. 

 Thorax. — The second of the main divisions of the body ; that part that bears 



the legs and wings (when present). 

 Thoracic. — Belonging to the ' thorax.' 

 Tibia. — The single joint of the leg immediately succeeding the 'femur' and 



preceding the 'tarsus.' {PL W. fig, 6, d.) 

 Triarticulate. — With three joints. 

 Tricuspid. — With three points. 

 Trimerous. — In three parts or joints. 

 Trochanter. — The small joint connecting the 'femur' with the 'coxa,' and 



usually firmly fused with the former. (/*/. \\. fig. 6, b.) 

 Truncate. — With extremity having the appearance of being abruptly cut off. 

 Tumescent. — Swollen. 

 Ungual. — Belonging to the claw. 

 Ventral. — Relating to the under surface of the body. 

 Ventral scale. — The under part of the ' puparium ' in the Diaspitue, interposed 



between the insect and the plant. 

 IVax glands. — Small circular glands concerned in the secretion of waxy matter: 



present on the pygidium as * circumgenital glands,' and round the 



' spiracles ' as ' parastigmatic glands ; occurring also on other parts of the 



body in various families. 



Scale of Inches and Millimetres. 



ilililililililililililiiilililililiiilmlilil 



iiiiiiiiiipiiiiiiiiiiii|iiiiiii|i|iiiiiiiiiii{iiiiiiiiiii|i|i|iiiiiii|i|i{i|i{i|i|t|i|iR^^ 



