1949] 
Dinnik and Zumpt — Rhipicephalince 
3 
“To what do these several parts correspond? The 
broad frame is the wall, the lips are the teeth, and the 
circular opening is the mouth of the short duct.” (See 
PL 1, fig. 1.) 
“The organ is securely anchored in the cuticula by 
the upper third of its length. The subjacent hypodermal 
cells are broader than high and surround the organ. The 
adjacent cells ( ?generative cells) are much higher than 
broad. Only two seem to be present, placed parallel to 
the margins of the lips. A large cell, considerably 
broader than high, lies beneath the organ, in close con- 
tact with the entire basal surface. The duct mentioned 
before is never long enough to pierce this basal cell, but 
ends with it without tapering downward. The duct is 
never lined with a tasnidium. So far as can be detected, 
the plasma of this cell is slightly granular, but a promi- 
nent clear spot in the center may be interpreted as an 
internal vesicle. It follows from this description that 
the structure is an integumentary glandular organ, not 
a larval respiratory organ with a spiracle and a rudi- 
mentary trachea.” 
So much for K. W. Neumann’s account of the mor- 
phology of his integumentary sense organ. In addition 
he discusses the number and position of these organs in 
various genera and believes to be justified in stating that 
originally two pairs were present. According to his ac- 
count, all the spiracle-like organs show essentially the 
same structure, though they are sometimes reduced in 
size, and they seem undoubtedly to be peculiar to the 
larvae. He does not mention any other integumentary 
sense organs besides these so-called “spiracles.” 
P. Schulze (1942a) published a detailed study of the 
integumentary sense organs of adult ticks and found, 
besides true sensory setae (sensilla trichoidea), four other 
types of sensilla which he called Sensdla auriformia (ear- 
shaped organs), Sensilla s a gittif or mia (arrow-shaped 
organs), Sensilla hastiformia (spear-shaped organs), 
and Sensilla laterniformia (lantern-shaped organs). 
Large numbers of these organs are located within the 
hard and soft chitinized integument of the body. On the 
other hand they are sparse on the legs and palps and, 
