242 
Psyche 
[September 
tion in atropos (Figs. 1 33~i 53 ) - Princis (1946) stated that the trun- 
cate elevation on the left side was 3-pronged whereas Hebard (1917) 
stated it was 2-pronged. These elevations may vary from a single arm 
(Fig. 152) to one consisting of more than 5 prongs (Figs. 133, 134). 
More striking is the marked reduction in numbers of the smaller 
preputial spines in some males. This usually occurs on the left side 
(Figs. 1 39-141, 1 44- 1 53) where there are few spines to begin with 
but a marked reduction may occur even on the right side (Figs. 141, 
153). In some males the spines are completely absent from the left 
side (Figs. 140, 141, 147, 149-153). 
In parabolicus (Figs. 1 55-1 70) most of the spines on the right side 
of the prepuce are more or less pointed. In some males there is a 
reduction in number of spines (Figs. 156, 169). Bruijning (1959) 
described the genitalia of parabolicus as follows: “At the extreme 
right of the preputium stout, rounded processes are inserted between 
the teeth ; some of the teeth on the free margin form pairs which are 
squarely inserted on the margin ; sinistrad the teeth are developed in 
blunt, stout, chitinous processes, while at the extreme left a large bi- 
to trilobate process is found . . .” An examination of Figs. 1 5 5- 1 7 ° 
shows that variability is so great that it is impossible to indicate 
specifically the number of truncate elevations on the left side or the 
exact arrangement and shapes of the preputial spines on the right. 
In B. discoidalis (Figs. 174-198) the truncate elevations on the left 
usually arise very close to L2vm, extend dorsally, and may even 
overlap L2vm (Figs. 175-180, 190). Preputial spines are more nu- 
merous on the right side, usually are somewhat truncate but some- 
times are rounded or pointed at the tips. In some specimens (Figs. 
195, 198) the right anterior spines, though smaller, tend to resemble 
the large elevations of the left side except that they are rarely fused 
at their bases (Fig. 195). The spines decrease in size distally on the 
membrane and in some individuals there is a reduction in number, 
usually on the left side. L2d is variable in size and shape. In a few 
males the large truncate elevations which are highly variable in num- 
ber on the left side are poorly defined or fused together (Figs. 182, 
184, 188, 1 91) and sometimes (Fig. 184) are reminiscent of the 
tumorlike outgrowth on the left side in the Giganteus Group. 
According to Princis (1946) the preputial armament is simple and 
sparse in anisitsi (Figs. 203, 204). His drawing shows a 3-pronged 
truncate elevation plus 3 bluntly rounded spines on the left side and 
only 5 smaller pointed spines on the right. The specimen shown in 
Fig. 203 was the one used by Princis (Fig. 6 in 1946; and identified 
