418 Scientific Intelligence. 
abdominal segment of the g is produced into a stout prominent 
central i y in is enti 
ally small, seldom exceeding half the length of the tibial 
the form is cultrate or lenticular. 
Scapteriscus is furnished with only two fore-tibial dactyls, both 
of which are movable; Gryllotalpa has two movable dactyls be- 
sides a second pair which are immovable. 
With but few exceptions, the hind femora of Scapteriseus more 
than equal the pronotum in length, while in Gryllotalpa they are 
always shorter than the pronotum. 
In Gryllotalpa the length of all the hind tarsal joints taken to- 
gether seldom exceeds half the width of the pronotum, while they 
equal its whole width in Scapteriscus. ‘ . 
e hind tarsal claws of Scapteriscus are clothed with short hairs 
_hearly to the tip; those of Gryllotalpa have hairs only at the base. 
The tegmina of Scapteriscus, with but few exceptions, cover, 
when at rest, two-thirds of the abdomen; in Gryllotalpa they sel 
dom conceal more than one-half of the abdomen. 
The nervures of the middle field of the tegmina in the females 
of Gryllotalpa are distant and rather irregular, somewhat resem 
bling those of the males; in Scapteriscus they are approximate, 
regular and straight. : s 
e anal ceri are longer than the pronotum in Gryllotalpt) 
shorter in Scapteriscus. : 
Finally, the ninth, and sometimes the eighth abdominal — 
are furnished above, in Gryllotalpa, with two transverse raped 
rows of long hairs directed inward, as if to keep the long fol 
wings in place; these are absent from Scapteriscus, where the wings 
are equally long and similarly folded. “pont the 
one species of Scapteriseus has been found eoapoes 
my wrrin 
limits of South and Central America, and that—oceurring an ola 
8 
Cylindrodes, ete., we find great and striking differences a 
erences whi ith th 
