JAMES A. G. REHN 
121 
Genotype: Gryllotalpa minor Bruner. 
The genus probably includes Gryllotalpa macilenta Saussure,^® 
from Surinam, but no material is available for comparison. Its 
general form, however, is close to that of the genotype of Gryllotal- 
pella, and the general form of the cephalic femora is figured as 
similar. 
Gryllotalpella minor (Bruner) 
1916. Gryllotalpa minor Bruner, Ann. Carneg. Mus., x, pp. .349, 3.50. [“Be- 
tween the farm Berlin and Guaja Mirim,” Rio Mamor6, Bolivia.] 
Manaos, Amazonas. (Mann and Baker.) One female. 
This specimen is slightly larger than the type and has distinctly 
longer tegmina and full}' developed caudate wings, which surpass 
the apex of the abdomen by more than half of the pronotal length. 
The measurements (in millimeters) are as follows: length of body, 
19.6; length of pronotum, 6; greatest width of pronotum, 4.2; 
length of tegmen, 8.1; length of wings distad of tegmina, 11.1; 
length of caudal femur, 4.5. 
Scapteriscus oxydactyla (Perty) 
1832. Gryllotalpa oxydactyla Perty, Delect. Anim. Artie. Brasil., p. 118, pi. 
23, fig. 7. [Interior of Minas Geraes, Brazil.] 
Rio jMadeira, five hundred miles from mouth. (IMann and 
Baker.) Two females, twenty-one immature specimens. 
Upper Beni River, Bolivia. (Dr. Heath, through E. D. Cope.) 
One male. 
Contamano, Rio Ucayali, Peru. October to December, 1912. 
One female. 
The immature specimens represent at least three instars pre- 
ceding maturity and in all the distinctive color pattern of the 
species is clearly indicated. These undeveloped individuals also 
show the progressive production of the dorsal thickening of the 
cephalic tibiae into a decurved lamellation, which in the mature 
condition and preceding instar cover over the auditory foramina, 
which in the least developed specimen are almost completely 
exposed reniform tympana. 
The range of the species extends from at least as far north as 
the Amazon Valley, south to Rosario, Argentina (Bruner), and 
from Rio Grande do 8ul and IMinas Geraes, west to the upper 
reaches of the Amazonian system in Peru (Contamano) and 
Bolivia (upper Beni). 
20 Miss. Scient. Mexiq., Rech. Zool., vi, p. 343, pi. viii, figs. 23, 23a, (1874). 
TRANS. AM. ENT. SOC., XLIII. 
