418 
MEXICAN DERMAPTERA 
Type . — cf ; Orizaba, Vera Cruz, Mexico February 20, 1892. 
(L. Bruner.) [Hebard Collection Type No. 435.] 
Size rather small, form moderately stout, but not as stout as in arachidis. 
Head as in that species, moderately convex with sutures obsolete; distal anten- 
nal joints not as elongate as in arachidis, longest about three times as long as 
greatest, meso^istal, width.'* Antennae with twelve to thirteen joints,'* 
one or two of the distal joints being pale. Pronotum subquadrate, caudal 
margin weakly convex-truncate;'^ prozona rather decidedly convex proximad 
with brief but distinct, convex, meso-lateral sulci wdiich converge caudad, 
weakly convex meso-caudad; metazona deplanate, with lateral margins feebly 
raised; the pronotum shows a feeble, medio-longitudinal, linear sulcus which is 
strongest cephalad. Tegmina nearly twice as long as pronotum, truncate 
distad ; wings extending beyond tegmina about two-thirds the pronotal length, 
narrowly truncate distad. Abdomen showing more hairs than in arachidis] 
second and third dorsal segments feebly and roundly keeled laterad, seventh 
and eighth dorsal segments with disto-lateral angles very broadly rounded, 
disto-dorsal segment simple, as in arachidis, showing a very feeble convex 
projection above each arm of the forceps. Pygidium, as in arachidis, sub- 
quadrate, slightly longer than wide, with disto-lateral portions briefly cut off 
obliquely and distal margin transverse, weakly concave. Forceps triquetrous, 
dorsal and ventral surfaces deplanate, hairy; inner surface deplanate between 
the distinctly raised margins at the juncture with the dorsal and ventral sur- 
faces, dorsal margin smooth, ventral margin with a minute offset tooth at the 
disto-lateral portion of the pygidium and with a minute tooth at twice this 
distance from the base of the forceps.'® Penultimate ventral abdominal seg- 
ment hairy, nearly three times as broad as long, with distal margin broadly 
convex and showing a feeble mesal concavity. 
Allotype . — 9 ; same data as type. [Hebard Collection.] 
Agrees with type except in the following characters. Size slightly larger, 
form slightly more robust than in male, not as stout as in this sex of arachidis. 
Disto-dorsal abdominal segment over twice as broad as long, distinctly nar- 
rower caudad than cephalad, weakly concave meso-distad, caudal margin 
truncate. Pygidium declivent, small, rectangular, disto-ventral portion inset 
between the forceps, its ventral surface in the same plane with ventral surface 
'* In arachidis fully four times as long as the greatest width, which is found 
at the apex. 
'* In the type the antennae are incomplete. These features are, in conse- 
quence, determined from the series. 
In the female before us lacking wings, the pronotum is as typical in arachi- 
dis, with caudal margin very weakly convex-truncate, in mesal portion almost 
perfectly transverse. This difference may very probably be found to accom- 
pany reduction in the organs of flight, a condition which has been found to 
occur almost universally in the Blattidae. 
'® In the type this second tooth is missing on the dextral arm, in the para- 
typic male it is present on both arms. 
