rARACOUOTOCA AKl'K.MANI (wAKREN). 345 



moderately cliitinised, occiput covered l)y two narrow, lateral 

 plates continuous with tlio gente. Ocelli very small [ocL), 

 situated laterally behind the antennal pits, Labrum and 

 the general surface of the head, thorax and abdomen bear 

 small, short bristles. 



Neck. — Practically absent, the head being in close, wide 

 contact with the prothorax. 



Thorax. — Prothorax. — In dorsal or ventral aspect 

 squarish. Two large oval chitinous plates on dorsal surface. 



Meso- and metathorax. — Much alike, wider than long, 

 each less than half the length of the prothorax ; tergal 

 portion considerably narrower from right to left than sternal 

 and lateral portions, which project on each side and are of 

 about the same width as that of the prothorax. Ventrally 

 a double groove divides the prothorax from the mesothorax ; 

 a slightly projecting ridge occurs laterally between the meso- 

 and metathorax (fig. 83). 



Abdomen. — Widely connected with the thorax. The abdo- 

 men is the widest part of the body; when moderately 

 contracted, as in fig. 82, it may be about H times the width 

 of the prothorax. There are 10 abdominal segments; the last 

 three are usually bent ventrally under the front portion of 

 the abdomen (fig. 83). Segments II-VI are provided with 

 conspicuous thin-walled lateral swellings which carry long, 

 thin bristles. Such long bristles also occur on the last three 

 segments of the body. 



Antenna. — Of moderate length, it has a singularly large 

 articulating membrane and three joints of very unequal length 

 (fig. 84). The basal joint is somewhat dumb-bell-shaped and 

 bears but few sette ; the 2nd joint is about three times the 

 length of the first, and it is thickest in the middle and carries 

 many setas ; on the inner side terminally it bears a small 

 conical, transparent outgrowth (" olfactory tooth ") which is 

 perhaps auditory in function ; the apical joint is very small, 

 being about ^ length of the 1st joint, and on the inner side 

 ou a step-like notch it carries a long, strong seta. Several 

 other stout setae are also carried by this joint. 



