28 IOWA STUDIES IN NATURAL HISTORY 
apical margin of the subgenital plate bear bristly hairs. No 
attempt is here made to suggest homologies for the male genitalia 
as above described. 
In the female we find in the genital chamber but a single 
noticeable organ, which is the rudimentary ovipositor consisting 
of six short, unchitinized appendages grouped compactly and 
attached near the upper wall in the middle of the chamber; 
these ovipositor valves are probably naturally directed caudad, 
but in several specimens, in which fully formed but unoxydized 
ootheea filled the cavity, they are directed diagonally backwards 
towards the head, or cephalad; the valves are finger-like and 
somewhat foot-shaped apically, at least one pair, the lower and 
largest ones, the others being somewhat shorter and more evenly 
rounded apically. Hebard, Mem. Amer. Ent. Soc., No. 2, p. 284, 
plate x, fig. 16 (1917), calls this the concealed ovipositor ; it is 
somewhat remindful of the external, but abortive, ovipositor in 
Stenopelmatus and Anurogryllus. If these valves are directly 
concerned with oviposition, the eggs must be immediately ar- 
ranged in the simultaneously forming ootheea, which is, at least 
in the females of the present species containing them, extended 
back into the abdominal cavity as successive lots of eggs are 
added, the completed ootheca almost completely filling the body 
cavity, the end near the tip of the abdomen only in juxtaposition 
with the ovipositor. This seems to show that the ootheca is formed 
completely within the body before it commences to be ejected, 
and that the end first appearing when deposited is the one last 
formed, just the opposite of what the writer had supposed the 
facts to really be. 
The range of measurements represented in the material of 
the roach now under consideration is as follows: Total length, 
front of head to tip of supraanal plate, ¢, 28 to 32 mm., @, 
31 to 37.5 mm.; tegmina, ¢,6.5to8mm., ?,7to 8 mm.; width 
of pronotum posteriorly, ¢, 14.5 to 17 mm., 2 15 to 20 mm. 
The following manuscript note by Prof. Stoner very surely 
refers to this species: 
‘Antigua, June 29, 1918. Found many specimens of a large 
brachypterous cockroach under rotten logs near a small fresh 
water pond about a mile from the dockyards.’’ In a published 
note, Can. Eni., vol. ui, p. 217 (1919), the immediate environ- 
