INSECTS AND THEIR NEAR RELATIVES . 
15 
AA. Abdomen unsegmented. 
B. Abdomen joined to the cephalothorax by a short, narrow stalk. 
(Spiders.) p. 20. Araneida. 
EB. Abdomen fused with the cephalothorax. (Mites.) p. 42. 
Acarina. 
Order SCORPIONIDA (Scor-pi-on'i-da). 
The Scorpions . 
With the scorpions (Fig. 8), the body is divided into a 
compact, unsegmented cephalothorax, and a long, segmented 
abdomen. The abdomen is divided 
into two portions : a broad pre-abdo¬ 
men, consisting of seven segments ; 
and a slenderer tail-like division, the 
post-abdomen, consisting of five seg¬ 
ments. At the end of the post-abdo¬ 
men there is a large poison-sting, 
which appears like a segment. The 
mandibles and the palpi are provided 
with pincers. As the palpi are very 
large, with stout pincers, they resem¬ 
ble in a striking manner the great claws 
of lobsters. The cephalothorax bears 
from three to six pairs of eyes. Scor¬ 
pions breathe by means of lung sacs, 
of which there are four pairs, opening 
on the lower side of the third to the 
sixth abdominal segments. 
Full-grown scorpions possess a pair ot comb-like organs 
on the lower side of the second abdominal segment. The 
function of these organs is not yet known. 
The sexes of scorpions differ in that the male has 
broader pincers and a longer post-abdomen. Scorpions do 
not lay eggs, the young being developed within the mother. 
After the birth of the young, the mother apparently shows 
great regard for them, carrying them about with her for 
