JAMES A. G. REHN 
97 
the ovipositor and limbs and the form of the subgenital plate. It 
has much resemblance to cornutoides Caudell, from Paraguay, 
northern Argentina and south-central Brazil, but the subgenital 
plate of the female is different and the insertion of the lateral lobes 
distinctive. 
Type. — 9 ; Porto Velho, Rio Madeira, Brazil. (Stanford 
Expedition; Mann and Baker.) [Acad. Nat. Sci. Phila., Type 
no. 5301.] 
Size average for the genus: form moderately compressed: surface with the 
polish usual in the genus. Head with the occiput weakly arcuate, faintly 
elevated dorsad of the plane of the pronotum, slightly flattened cephalad; 
fastigium moderately dechvent, weakly sulcate, the apex weakly bulbous and 
separated by a distinct, transverse depression from the remainder of the 
fastigium, the apex fully in contact with the relatively narrow facial fastigium : 
eyes hardly prominent, subcircular in basal outline, this slightly flattened 
cephalad; depth of the eye faintly greater than that of the infra-ocular portion 
of the genae. Pronotum with the disk deplanate, the greatest caudal width of 
the latter contained one and one-third times in the greatest length of the disk: 
cephalic margin of the disk subtruncate; caudal margin strongly arcuate, 
forming more than a quadrant; lateral angles of the disk narrowly rounded, 
more broadly so cephalad than elsewhere; surface of the disk rather sparsely 
punctate, median figure broadly U-shaped, deeply impressed: lateral lobes 
distinctly deeper than long; cephalic margin sinuate, thence regularly arcuate 
ventrad, caudad and finally dorsad to the infra-humeral obtuse-angulation, 
humeral sinus rotundato-rectangulate. Tegmina surpassing the apices of 
the caudal femora by slightly more than the length of the pronotal disk, 
elongate lanceolate, greatest width contained four times in the greatest length 
of the tegmen: costal margin arcuate distad, somewhat flattened proximad; 
sutural margin distad of the anal field straight except in distal sixth, where it 
is obliquely rotundato-truncate, the apex broadly rounded acute-angulate: 
mediastine vein subobsolete, very short ; humeral and discoidal veins contigu- 
ous in proximal half, moderately separated thence distad; median vein diverg- 
ing from the discoidal vein at about the proximal third, bifurcate, the branches 
reaching the sutural margin at the arcuation where the oblique distal portion 
of the margin joins the major portion; ulnar vein faint!}" sinuate; transverse 
nervures numerous, well marked, subparallel, oblique. Wings surpassing 
the apices of the tegmina by one and one-half times the dorsal length of the 
pronotal disk, apex subacute. Prosternum unarmed; mesosternal lobes 
rectangulate; metasternal lobes arcuate laterad, subtruncate caudad. .-Vb- 
domen with the disto-dorsal segment weakly tectate, the surface impressed 
on each side of the median line, distal margin subtruncate with a very slight, 
shallow V-emargination mesad, distinct emarginations present at the cereal 
bases: supra-anal plate rectangulate, surface with a U-shaped depression: 
cerci rather short, incrassate, the tips sharply attenuate, general form of the 
cercus somewhat arcuate: infra-cercal plates subreniform in outline, surface 
TRANS. AM. ENT. SOC., XLIII. 
