SELLARDS. | Cockroaches. O21 
along the costal border, and dark bands accompany some of 
the veins. 
A few nymphs having light and dark areas on the body oc- 
cur in association with the wings, and are without doubt of 
this species. The abdomen is slender. The sterna are pointed 
at the posterior corner instead of rounded as in Htoblattina. 
The ovipositor also, as shown by these specimens, is much 
shorter, projecting but little beyond the abdomen. Length of 
tegmina, 22 to 25 mm.; width, 8 to9 mm. Hind wing, 16 to 
18 mm. long, 8 to 9 mm. wide. 
In the original description of FH. benedicta, Scudder ex- 
pressed doubt as to its specific separation from EH. maledicta. 
The differences which seemed to distinguish the two forms 
were the more arched costal border of LH’. benedicta, the lesser 
extent of the cubital area, and the approximation in the point 
of origin of the two radial branches. More than forty-five 
tegmina of this species are at hand for comparison. Camera 
lucida sketches of numerous wings show that while those with 
a short cubitus have, as a rule, a more arched border, there is 
an almost continuous series between with no break sufficient to 
serve as a specific character. Figures 26 and 27, plate 76, show 
the extreme limits in the extent of the cubitus, the two wings 
illustrated corresponding closely to the types of the two species. 
In one the cubitus falls decidedly short of the apical margin, 
while in the other it extends by an outward curve and more 
numerous branches well onto this border. Other specimens 
show that the cubitus is variable in extent, and individuals 
can be found so nearly intermediate that a specific separation 
can hardly be sustained on this character. The third dis- 
tinction given, the approximation in the point of origin of the 
first and second radial branches, is not constant. The large 
number of specimens of this species at hand allows a closer 
study of individual variation of the veins of the tegmina than 
has been possible heretofore in any Paleozoic species. The 
results emphasize the necessity of allowing for a certain 
amount of individual variation among the accessory branches 
of the wing, and to some extent in the relative extent of the 
main divisions. | 
Formation and locality: Le Roy shales, Upper Coal Meas- 
ures, Lawrence, Kan. Nos. 4, 17, 18, 19, 29, 37, 41, 47, 48, 50, 
54, 56, 60, 61, 64, 66, 70, 72, 75, 79, 85, 92, 938, 101, 105, 107, 
el pelle OA ZO lore so love so. ad. 145. 164, 
