120 
BRAZILIAN ORTHOPTERA 
are quite small. The smallest and one of the largest specimens 
from Contamano, as well as the Port Limon individual, measure 
(in millimeters) as follows: 
Length of 
Length of 
body 
Length of 
pronotum 
Greatest 
width of 
pronotum 
Length of 
tegmen 
Wing 
distad 
of 
tegmen 
Length of 
caudal 
femur 
cf Port Limon, Costa Rica 
. 19 
6.2 
4.5 
7 
3.6 
5.2 
cf Contamano, Peru 
.19.1 
5.1 
4 
7.3 
11.8 
4.8 
9 Contamano, Peru 
. 25.4 
6.7 
5.1 
9 
13.5 
6.4 
In none of the present series do the tegmina reach to the apices 
of the caudal femora. As far as the present relatively extensive 
series is concerned, we find no tendency toward the spination of 
the dorso-internal margin of the caudal tibiae, such as has been 
noted in G. hexadactyla. 
GRYLLOTALPELLA new genus 
Related to Gryllotalpa Latreille, from which it can be readily 
distinguished by the auditory foramina of the cephalic tibiae 
being open and sub-reniform, while in Gryllotalpa they are rimate, 
occasionally the slit having a slight overhanging and covering 
projection. In Gryllotalpella the ventro-caudal margin of the 
cephalic femora are unexpanded and simple, while in Gryllotalpa 
this margin is lamellate expanded. The tegminal venation of 
Gryllotalpella is much more simple, with almost no proximal cross- 
veins, than in Gryllotalpa, which has numerous cross-veins in the 
same section. The form in Gryllotalpella is also much more 
slender and the size smaller than in the species of Gryllotalpa. 
Generic Characters — Form slender, its general development 
Gryllotalpoid. Head narrow; eyes large, closely placed. Pro- 
notum sub-rhombiform, greatest width cephalad of the middle. 
Tegmina with venation showing few cross-veins, these largely 
distad; marginal field with reduced proximal section. Cephalic 
femora with ventral margins carinate, non-lamellate: trochan- 
terial process distinct, trigonal: cephalic tibiae with auditory 
foramina exposed, subreniform, with margins cingulate and 
membrane complete; digits four in number: cephalic metatarsi 
as in Gryllotalpa. Caudal tibiae armed at apex with six spines.^® 
li Gryllotalpa tnacilenta Saussure is found to be a member of this genus, as 
appears quite probable, this sentence will require modification, as it is said to 
have but four spines in this position. 
