325 
PANAMA DERMAPTERA 
forceps as in the adult, not rei)resented by segmented cerci as 
found in the early stages of the Diplatyinae. 
Eugerax poecilum new species (Plate XXVI, figs. 12, 13, 14 and 15.) 
The present beautiful species is the smallest of the known forms 
of the Dermaptera. Some similarity in general form and an- 
tennal coloration is shown to Prolabia formica (Burr), the male of 
that species showing, however, very wide differentiation in having 
the widely separated forceps bowed and unlike those of the 
opposite sex. 
Type . — (T ; Paraiso, Canal Zone, Panama. January 19, 1911. 
E. A. Schwarz.) [U. S. National Museum.] 
The characters of greatest importance are given in the key and generic 
diagnosis. In addition, we would note the following. Form moderately 
slender. Head with surface thickly covered with microscopic hairs; lateral 
margins of cheeks distinctly convergent to the broadly rounded latero-caudal 
angles, caudal margin transverse; occipital sutures almost obsolete. Antennal 
joints not moniliform, (normally eleven to thirteen in series^®); first joint ecjual 
to combined length of second and third joints; fourth slightly shorter than 
third; succeeding joints increasing, then decreasing, in length, longest about two 
and one-half times as long as wide. Pronoturn very small, covered with micro- 
scopic hairs and with a few bristles along the lateral margins, caudal margin 
strongly convex; prozona convex; metazona strongly ascending laterad and 
caudad. Tegmina with surface thickly covered with minute hairs; evenly 
convex from sutural to costal margin beyond shoulders, broadest near apex 
where costal margin rounds broadly into the straight, transverse distal margin, 
which forms a sharply rounded right-angle with the sutural margin. Wings 
similarly hairy, with costal margin weakly convex to the moderate, transverse 
distal truncation. Ultimate dorsal abdominal segment much as in Banjgerax 
esaii. Pygidium not apparent. Forceps much as in Gerax phantasma, but 
slightly shorter, with shaft moderately upcurved. (Metaperameres projecting, 
soft, unarmed.) Beneath each arm of the forceps a nearly straight, elongate, 
chitinous, aciculate process projects caudad. Penultimate ventral abdominal 
segment with distal margin moderately convex laterad, thus forming a shal- 
lowly angulate emargination mesad. 
Allotype . — 9 ; same data as type, but taken February 6, 1911. 
[U. S. National Museum.] 
This sex agrees with the male to an exceptional degree. The only noticeable 
differences are that the size is very slightly larger; the form is slightly more 
robust; the ventro-internal margins of the forceps are smooth; the aciculate 
projections beneath the forceps are absent, and the number of ventral abdom- 
inal segments (not including the penultimate segment), as is found through- 
out the Dermaptera, are five in the female, seven in the male. 
See page 322, footnoote 29. 
