42 .1/. A. Carrikcr 



band ; a slightly darker occipital patch ; whole head smoky 

 fulvous. 



Prothorax unusually large with clear lateral wings ; anterior 

 and posterior margins concave ; lateral angles very obtuse ; an- 

 tero-Iateral margins slightly concave, postero-lateral portions 

 straight and diverging; median portion of segment dusky; pale 

 internal bands running back from the lateral margins, near the 

 anterior angles, to metathorax. Metathorax scarcely larger than 

 prothorax, with anterior and posterior margins truncate; sides 

 slightly sinuate, diverging; a faint clear line at the meso-meta- 

 thoracic suture; anterior region of segment, and broad lateral 

 bands of brownish fulvous, continuous with lateral bands of 

 abdomen. 



Anterior legs short and weak, same color as head ; two pos- 

 terior pairs long and stout, with femora margined before and 

 behind with blackish ; the whole femora and tibia deep smoky 

 brown. 



Abdomen narrowly oval, with scarcely protruding acute angles, 

 furnished with one weak hair; posterior margin of first three 

 segments flatly angulated ; four and five transverse and six con- 

 cave ; broad, marginal, imbroken, lateral bands on s£gments one 

 to seven, with inner border emarginate on segments four to seven ; 

 eighth segment clear, vulva convex, fringed with fine hairs; in 

 the middle of the broad lateral band is to be found the peculiar 

 chain-shaped band of chitin common to the genus ; broad, median, 

 transverse bands of brownish fulvous, separated by narrow, clear 

 sutures, on segments one to seven. 



Three females collected from Ainizillis tsacatl, at Juan Vinas 

 in March and three females from Selasphorns -flainmula on the 

 volcano Irazu, Costa Rica, February, 1902. 



This species much resembles microcephahiin Kell., but is eas- 

 ily distinguished from that species by the large clear prothorax 

 and the absence of numerous long hairs on the head and thorax. 

 It seems to be a common parasite of several species of hum- 

 mingbirds since it was taken on quite different species in very 

 different locaHties. 



164 



