158 
Psyche 
[I>ecember 
triangular in outline and partly overlapping the cylindrical 
distal segment. The pretarsus contains some detail not 
resolvable by the light microscope, but there is visible a 
single (?) irregularly shaped, nearly transparent distal 
pad flanked by at least two bristles. Claws in the conven- 
tional sense are lacking. 
Seven abdominal segments are visible in ventral view 
(see pi. 12, flg. B). Division in the anterior tergites is 
indistinct, so that correspondence with individual sternites 
is uncertain. Perhaps the most unusual feature of the ab- 
domen is the shape of the first six visible sternites. These 
are very wide and are produced dorsally to overlap in part 
the adjacent tergites. The dorsal sternital tips are pre- 
sumably what Seevers and Dybas refer to as “paratergites” 
in their general description of the limulodid abdomen. 
This peculiar modification in abdominal structure seems 
best interpreted as providing a sort of shingle-armor pro- 
tection for the lateral intersegmental membranes. 
Behavior. As noted previously, Paralimulodes occurs 
naturally with the army ants Neivaynyrmex carolinense 
and N. nigrescens in Alabama. Both of these species are 
abundant within the presently known range of the beetle. 
That Paralimulodes is truly host-specific for N eivamyinnex 
is suggested by the following observations. A colony of N. 
nigrescens from Hurricane Creek, found within fifty feet 
of the infested carolinense colony, was maintained for sev- 
eral days with the queen in an artificial nest. No Paralimu- 
lodes could be found with the thousands of workers, des- 
pite the earlier proximity of the two ant colonies. But 
when beetles were isolated from the carolineyise and placed 
in the nigrescens nest, they proceeded with little hesita- 
tion or opposition into the mass of resting workers. Twen- 
ty-four hours later they were still ensconced with their 
new hosts. When other Paralimulodes were transferred to 
Explanation of Plate 13 
{Paralimulodes wasmanni Bruch; Lawrence Co., Ala.). — Figs, a-d, 
mouthparts in ventral view. Fig. e, ventral view of left antenna. Fig. 
f, aedeagus tube, ventral view. Fig. g, spermatheca, ventral view. Fig. h, 
tarsus, including only structures clearly visible with the light micro- 
.scope; terminal tarsal segment rotated to show pretarsus in dorsal view. 
