290 ENTOMOLOGICAL NEWS. [July, ’16 
Blaberus giganteus (Linnaeus). (Plate XV, fig. 1). 
1758. B[latta] gigantea Linnaeus, Syst. Nat, Ed. X, I, p. 424. 
[America.] 
1813. [Blatta] gigantea Stoll, Natuur. Afbeeld. Kakkerlakken, p 
2, Register p. 1, pl. Id, figs. 1 and 2. (No locality given.) 
1865. Bl{abera] stolli Brunner, Nouv. Syst. Blatt., p. 374. [2, Cay- 
enne, [French Guiana].] 
This species is closely related to B. colosseus (lIlliger), 
differing in the distinctly broader form. The broader pro- 
notum has, in the female sex,! the cephalic portion more 
ample, the curvature laterad of the cephalic margin less de- 
cided, thus leaving distinctly more extensive lateral margins 
which are subparallel for a short distance (as described for 
gigantea by Illiger). In our material the length of the pro- 
notum is contained in its width 1.49 to 1.5 times (Saussure 
gives for this species 1.48 to 1.50). The tegmina are propor- 
tionately broader, with marginal fields distinctly wider, than in 
colosseus. Linnaeus gives “diametro ovi gallinacei” for this 
species; the series before us of colosseus are decidedly too 
slender to fit this description. 
We have given Stoll’s reference, as Brunner has described 
such material as B. stolli. We are satisfied that the features 
given by Brunner for the separation of that condition are of 
no specific diagnostic value, being due to recessive coloration 
and slight individual differences in the interocular width and 
rounding of the apices of the tegmina. 
The great size and very pale buffy general coloration of 
giganteus and colosseus readily distinguish them from any 
other species of the genus. Both agree in numerous features 
of interest given here under the latter species. 
Measurements (in millimeters). 
Leugth Length Width Length Width Width Lengthin 
of pro-' of pro- of of of costal width of 
2 body? notum notum tegmen tegmen field pronotum 
Cincinnati, Colombia 66.0 17.3 25 8 66.8 B52 8.3 X 1.49+ 
Cincinnati, Colombia 58.2 17.2 25-7 66.2 25.8 8.4 Xn5 + 
Cincinnati, Colombia 63.0 16. 6 25.0 65-3 25.0 8.0 X 1.5 
1 ack of males of the present species is unfortunate, but it is prob- 
able that the contrast between the sexes in giganteus is in every way 
comparable with that found between the sexes in colosseus. 
“The body measurement js taken to the apex of the subgenital plate; 
the supra-anal plate, in the present genus, extends beyond this point. 
