174 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
grasshopper (Phaneroptera), but which maybe described as nearly like 
thatof the CEcanthus, only notlong continued, but sharper and stronger." 
The want of continuity in the shrilling noise is probably owing to the 
small size and expanse of the wings as compared with the fully (level- 
oped wings of the katydids and the cricket. That the hind wings are 
not concerned in making the sound is proved by their undeveloped, soft, 
limp condition. 
The hind body, or abdomen. — This region is about half as long as the 
body, and is a little flattened sideways, ending abruptly, and in the fe- 
male terminates in the large saber-shaped ovipositor. It consists of 
seven well-marked segments, the other three being rudimentary. Be- 
neath are eight hard pieces (sternites, Fig. 4, 2-8), surrounded by a mem- 
brane; the four basal ones are broader than long; the fifth nearly twice 
as long as broad ; the sixth large, rounded, shield-shaped ; the seventh 
thickened, boss-like, and one-half as large as the sixth. The eighth piece 
forms a large (oviducal) plate, which is broad, square, beveled olf at the 
posterior end, with a slight median ridge, and a sharp spine at each side 
of the posterior edge. From each side of the plate is sent off" a spatulate 
lobe reaching to the base of the spine below. 
The tenth ring forms the supra-anal plate, the pointed end of which 
is subtriangular, sunken in the middle and with raised edges, this pos- 
terior portion forming a depressed flap covering the anal opening. On 
each side of this supra-anal flap is a cercus or appendage (Fig. 4, c), 
each acute, small, and slightly hairy. Two rounded, fleshy infra-anal 
flaps are situated each side of and below the supra-anal flap, and partly 
conceal the vent. 
The ovipositor is a little over one-half as long as the body, it is 
compressed, and the base is as broad as deep. It can easily be sep- 
arated into three pairs of blades called rhabdites. The eggs pass out 
through the inner of the three pairs of blades constituting the oviposi- 
tor. For example, an egg after leaving the mouth of the oviduct passes 
along between the lower (or middle) and the inner pair of blades. The 
base of the lower pair of blades has a chitiuous lobe, which isflattened, 
closing tightly, and when the ovipositor is depressed fills or covers the 
mouth of the oviduct. The lower pair of blades is lined at the base 
with a membrane, while the passage for the egg is roofed over by a 
membrane connecting the base of the inner blades. 
In the abdomen of the male the tenth segment is separated by the 
supra-anal plate, which covers nearly twice the area it does in the fe- 
male ; it is nearly one-half as long as wide, with a triangular furrow, 
which is membranous at the bottom, so as to allow the two sides of the 
plate to move together, and thus approximate the claspers. The cerci, 
which are simple pointed appendages in the female, are here converted 
into a pair of stout claspers (Fig. 1, 2, b, c), ending in two unequal hooks, 
the larger hook bent at right angles ; the claspers, owing to the triang- 
