420 
MEXICAN DERMAPTERA 
its dorsal margin creniilate in one, very feebly so in the other 
specimen; in both, the ventro-internal margins of this portion 
are rather minutely denticulate than crenate as originally de- 
scribed, with a single stout, distal tooth, this tooth, however, 
smaller than the median tooth. The dilation beyond the median 
tooth is acute-angulate distad rather than toothed. 
The female has the pygidium longer than broad, with lateral 
margins strongly concave, convergent, then divergent for a shorter 
distance to the acute-angulate, disto-lateral angles, the distal 
margin briefly acute-angulate produced to a less degree, with 
apex of the production blunt. The female forceps are nearly 
straight, with ventral margin produced in a moderate flange to 
the arcuate distal portion, this flange showing rather widely 
spaced, blunted teeth to just beyond the mesal portion, where it 
is weakly angulate produced, from this point distad the flange 
is narrower, with margin smooth, to its weakly convex termina- 
tion. 
Measurements (in millimeters) 
Length of Length of Length of Length of 
body pronotum tegmen forceps 
cf Motzorongo. (2) 10-10.7 1.6-1. 7 2.8-3 3.8-4. 1 
9 Motzorongo. (5) 9.5-10.6 1.6-1. 7 2. 7-2. 8 2. 3-2. 7 
The only other species of the genus described from Mexico, 
*S. bormansi Kirby, is described as having, in the female type, 
the pygidium with central part projecting rectangularly and 
longer than the basal part. 
Parasparatta dentifera (Rehn) (Plate XXVIII, figures 10 and 11.) 
1901. Sparatta dentifera Rehn, Trans. Am. Ent. Soc., xxvii, p. 218. [Orizaba, 
Vera Cruz, Mexico.] 
1907. Sparatta minuta Caudell, Proc. U. S. Nat. Mus., xxxiii, p. 172. [Polo- 
chic River below mouth of Cahabon River, Guatemala.] 
The types of dentifera and minuta show the unquestionable 
synonymy indicated above. It should be noted that Rehn 
mistook the female type of dentifera for a male and described 
it as such. The present series of adult males shows this species 
to be widely distinct from Burr’s P. armata. It is clear that Burr, 
in the Genera Insectorum, indulged too freely in conjecture when 
he placed, with queries, dentifera (with other names, three of which 
we find to represent valid species) under S. pelvimetra and minuta 
under P. armata. 
