BARBADOS-ANTIGUA REPORTS 25 
chitinized piece with the left hand apical part forming a short, sharp, 
apically slightly decurved tooth, Fig. le. Below this last described piece, 
projecting from a fleshy base, is a sharp upwardly directed chitinized 
spine, Fig. 1d, and to its right lies a large basally folded plate, fully 
chitinized, and with the rgiht portion developed into a very long, sharp 
and slender sinuate spine, directed caudad and to the left, and extending 
out fully as far as the tip of the sinistral hook; Fig. le shows this 
structure, and illustrates, as well as may be, how the chitinized base forms 
on the left a blunt tooth-like projection, but does not show the deep 
transverse folding. Far back in the right hand side of the chamber is 
seen a long, slender, recurved, fully chitinized, cycle-like blade curving to 
the left near the dorsal wall of the chamber and apparently arising from 
a fleshy unchitinized base of considerable size; this is the dextral hook 
and is shown at Fig. 1f. Below the base of the above noted appendage 
there is a large, thick, apically truncate, partly chitinized mass, as roughly 
indicated from an apical view at Fig. lg. The unchitinized or partly 
chitinized portions of the genitalia, as noted above, may be noticeably 
different in fresh specimens, but the chitinized portions, so far as visible 
and here described, will probably prove stable, though more of them may 
possibly be found if fresh or alcoholic material be more thoroughly dis- 
sected, as they may lie wholly concealed by tissue. 
In the genital chamber of the female we see the six valves of the oviposi- 
tor grouped about the middle of the chamber, and on either side of the 
ovipositor is a thin, horizontal, bluntly subtriangular plate with the sur- 
face sparsely covered with coarse short bristly spinules; above the back 
of these plates and extending to the base of the ovipositor are thick 
chitinized areas of definite shape. 
Measurements.—Length, entire insect from front of head to tip of 
supraanal plate, 6, 29 mm., 9, 25 to 29 mm.; pronotum, 4 8 to 9 mm.; 
tegmina, 6 and 9, 9 mm.; width, pronotum at hind margin, 6 11 mm., 9 
11 to 12 mm.; tegmina at middle, 6 8 to 9 mm. 
Type 4, Antigua, June 29, 1918; allotype, 9, same data as the type; 
paratypes a, b, and ec, adult 9 9, a and b same data as types and c dated 
July, and d, e and f, 6 nymphs, same data as type. 
Type, allotype and paratypes ¢ and d in collection of the United States 
National Museum, the rest of the material in the University of Iowa. 
Catalogue No. 25141 U. 8S. N. M. 
parative studies of different genera and groups is desirable, however, before attempt- 
ing to formulate a satisfactory terminology. 
The genital chamber of the female, so far as now known to the writer, contains 
no such complicated structures as found in the males. In the chamber of the female 
is found a rudimentary ovipositor consisting of six grouped valves, short and not, 
or but little chitinized, extending out from the posterior portion of the cavity and 
there may be on each side of this ovipositor a broad partly chitinized plate. On 
the inner surface of the subgenital plate, and thus in the genital chamber, there may 
be a channel formed by longitudinal partitions, as described herein under Eurycotis 
similis. But in no species examined have I found chitinized organs corresponding 
to the genital hooks and other fully chitinized structures of the male. 
