128 
COLOMBIAN' DERMAPTBILA. AND ORTIIOPTfcR\ 
(three) complete and (three) incomplete branches of the ulnar vein. Med- 
ian segment unspecialized. Abdominal tergites with latero-caudal angles 
not j)roduced; fourth with median third ])roduced caudad in a rounded tra- 
])ezoidal plate, which extends as far as the caudal margin of the sixth tergite, 
thereby covering a large circular cavity, which occurs mesad in the sixth 
tergite; fifth tergite with caudal margin transverse to margins of j)roduced 
fourth tergite, thence deeply concave-emarginate in median half, this emar- 
gination affording space for the cavity in the .sixth tergite. Seventh tergite 
rather broadly visible, eighth ai)i)arently absent. 
Supra-anal plate ])roduced, rounded trapezoidal between cereal liases, 
this portion with length three-quarters its ])roximal width. Subgenital 
|)late w'ith distal jiortion of dorsal surface remarkably specialized as follows: 
dextral surface of plate jiroduced distad on its internal surface in a heavy, 
cylindrical process, which is slightly longer than wide; from tlie flat apex 
of this process springs the dextral style, a stout process nearly four times 
as long as its j)roximal wddth, tapering to a heavy spine which forms its apex, 
and bearing dorsad near the base of this spine another similar but smaller 
.s])ine, ilirected dorso-di.stad; the direction of base and style is weakly meso- 
dorsad, nearly on a line wdth the dextral margin of the plate. Subgenital 
!)late with sinistral surface produced dorsad on its internal surface in a large 
heavy, rounded process, from the apex of which springs an exceedingly elon- 
gate and tapering agglutinated mass of spiniform hairs, which mass is sharply 
recurved at its base and directed ventro-sinistrad; the dextral portion of 
the production forms a broad plate from aj)ex to base, of such a form that 
the entire caudal surface of the production is concave, the free margin of 
this plate supplied wdth a heavy fringe of very elongate spiiuform hairs, 
these directed distad, wdth distal portions of all but the more dorsal curving 
.sinLstrad (see plate VIII, figure l(i). Subgenital plate with brief sinistral 
margin deei)ly concave-emarginate to two minute projections, which are 
situated sinistrad, the tlextral margin strongly oblique |)roximad, then form- 
ing an angulation, straight and very weakly oblicpie to the apex formed with 
the sini.stral margin; projections at this apex, two minute, cylindrical pro- 
cesses, with ajjiees rounded, the dextral of which is twice as long as the sin- 
ist rah 
himbs as characteristic of the genus. 
Head ochrac(>(ju.s-bulT, with vertc'x dark chestnut brown to above ocellar 
areas and two small points of the same, joining in a trainsverse marking be- 
low' and between the antennal sockets. Pjonotum chestnut brown, this 
shading gradmdly into the narrow ochrac(‘()us-bulT margin cephalad, which 
becomes widei' on the lateral margins and invades the darker area briefly 
latero-caiudad. 'regmina translucent tawny, except the marginal field which 
is ochraceou.s-bufl. Wings tnuisparent, tinged with i)rout’s brown, this heavv 
in areas of bnuiched veins, veins prout’s bi'own, this somewhat darkest in 
marginal portion of costal field. Dorsal surface of abdonum i)rout ’s lirown, 
