Chorisoneura panamae Hebard 1920

Chorisoneura panamae new species (Plate VI, figures 9 and 10.)
The present species is a member of what we term the Pellucida
'»2 The ventral femoral margins, in our o])inion, are supplied, characteristically, with a few hairs, rather than "supplied with a few weak, short spines." The male supraanal plate is about one-third as long as its basal width, with apex broadly truncate and subbilobate.
Group. i'^^ It is closely related to C. pellucida Saussure,i^-^ agreeing closely in size, form and general coloration, but differs in the followingrespects: head with occiputdark,interocular-ocellar area whitish, with a pair of approximate dark brown dots and a smaller pair of more widely separated dots; pronotum with two short, longitudinally parallel, pale lines; much less transverse male supra-anal plate, and male subgenital plate with styles and intervening process distinctive.
Close relationship to C. lata Rehn, recently described from Pari, Brazil, is also shown. Comparison with the type of that species shows close agreement in size, form, general coloration and pronotal marking, that insect differing, how^ever, in the following features: head immaculate'^'^'' with two widely separated dark dots In the interocular-ocellar area; narrower pellucid border of tegmina; male subgenital plate with styles less elongate, broader and more truncate distad, the interval between their bases showing no mesal production whatever, but only two minutely microscopic decurved teeth.
In C. tessellata Rehn, from Ceara Mirim, Brazil, in addition to the distinctive coloration, we would note that the styles are of the type found in pellucida, but that the minute triangular production between their bases, though similar in form, is in tessellata surmounted by a single minute, but heavy, decurved tooth.
'^ This group includes a number of relatively large, broad species, all of \hich show marked specialization of the area between the stylqs of the male subgenital plate. In the collections at hand the following species belong to this group; lata Rehn, panamae here described, pellucida Saussure and tessellata Rehn. The two latter species show greater specialization of the male styles, these having their apices inwardly produced and overlapping, while the shafts of the styles arc parallel in normal position and do not diverge.
Specimens at hand, recorded by Rehn as C. minula Saussure and C. prrhicida (Walker), represent a closely alUed group, agreeing in general size and form, but having the greatest male genitalic specialization on the internal margin of the sinistral style, near its base, and showing no specialization of the median area between the bases of the styles.
'•''^ Saussurc's original description of pellucida, from a Mexican female, is excellently supplemented by his later treatment of the species, from both sexes, taken near Moyoapan, Mexico (Hist. Nat. Mex., Rech. Zool., vi, p. 92, pi. ii, figs. 49 and 49a, (1870)). His color figure is excellent, except that the general coloration should apparently hae a decidedly more orange tinge. Our comparisons here are supplemented by examination of a male of pellucida from San Rafael, Vera Cruz, Mexico, in the Hebard Collection.
1*8 The type, however, has the head decidedly discolored. The species may be foimd to have the interocular-ocellar area pale, as in panamae. Type. — cf ; Porto Bello, Panama. April 17, 1912. (A. Busck.) [United States National Museum.]
Size large for the genus; form depressed, in outline elongate elliptico-ovoid. Head broad, decidedly depressed; from the dorsum practically the entire occiput and cephalic half of the eyes are seen to be exposed, occipital outline truncate, the eyes almost imperceptibly projecting beyond the interocular area; interocular space broad, one and one-half times occipital ocular depth, about four-fifths as wide as space between antennal sockets. Antennae nearly one and one-half times as long as body. Maxillary palpi with third joint elongate and slender; fourth joint threequarters as long as third; fifth joint subequal in length to fourth, moderately enlarged.
Pronotum transverse ellii^tical, with a rectangulate tendency, due to the wide and strongly transverse cephalic and caudal margins, cephalic margin showing a trace of convexity only above head, caudal margin showing a very feeble convexity, lateral margins broadly convex, rounding evenly into cephalic and caudal margins; greatest width of pronotum mesad; disk with a shallow medio-longitudinal impression and a pair of brief oblique sulci laterad, lateral portions weakly declivent cephalad, where the surfaces are very shallowly concave, weakly bossed over the tegminal bases. Tegmina elongate, extending briefly beyond cereal apices, greatest width at proximal third, thence narrowing evenly to near the sharply rounded but acute apex; marginal field very broad; discoidal vein with (sixteen) branches, between which are a number of well developed false nervures, discoidal sectors (fifteen, counting all branches) strongly oblique.'" Wings with a considerable intercalated triangle, acute-angulate proximad; (fourteen) costal veins (with nine) heavily and briefly clubbed distad, the more distal with clubbed portion more elongate and slender; discoidal and median -eins connected by (ten) distinct cross-veinlets; ulnar vein branching near extremity and sending another branch to the margin of the intercalated triangle; axillary vein branching twice; the distal branch bifurcate.
Sixth dorsal abdominal segment with a large but not strongly concave area mesad, the margins of which are feebly raised latcro-cephalad, convex, the depression containing a moderate number of agglutinated hairs, closely pressed upon its surface. Supra-anal plate nearly one-third as long as basal width, triangular, with apex broadly truncate and lateral margins very feebly concave, convergent. Cerci elongate, depressed, fusiform, very slender distad, tapering to acute apices. Subgenital plate with sinistral margin short and straight to base of sinistral style, dextral margin longer and moderately concave to base of dextral style; styles situated in poorly defined sockets, very elongate, broad at bases, tapering to apices which are lamellate and rounded, this strongest externally, each supplied on its internal face just before the apex with a central patch of microscopic teeth; between the styles the median portion of the plate is produced in a slender chitinous shaft, approximately half the length of one of the styles, armed at its apex with two small,
15^ Five of the discoidal sectors spring from the discoidal instead of from the median v^ein distad; this is an amplification of the condition found in many other forms of
Chorisoneiira.
slender, chitinous teeth, which curve toward each other, thus giving this portion some resemblance to one of the smaller claws of a crab.
Ventro-cephalic margin of cephalic femora armed with a row of minute and somewhat irregular microscopic chaetiform spines, of which the more proximal are the longer, terminated by a single elongate distal spine. Other limb characters as given on page 132 for C. fuscipennis, there described.
Allotype. — 9 ; Porto Bello, Panama. April 21, 1912. (A. Busck.) [United States National Museum.]
Agrees closely with type. Tegmina nearly as elongate. Interocular space wider, fully four-fifths as wide as space between antennal sockets. Supra-anal plate triangularly produced, strongly notched at apex, this rounded emarginate, deeper than wide, the two sharply rounded portions thus formed with surfaces moderately convex, lateral margins feebly concave. Subgenital plate ample, narrow distal portion reflexed, longitudinally cleft mesad.
Measurements {in millimeters)
Length of Length of Width of Length of Width of
cf body pronotum pronotum tegmen tegmen
VortoBeWo, type 10 2.4 3-9 iO-9 3-4
Rio Trinidad, ^ara/>'/)e ... . 10. i 2.4 3.9 10.3 3.2
Rio Trinidad, /?ara/v/?e. .. . 10 2.4 3.9 10.7 3.4 Porto Bello, a//o/,vpp 10.7 2.4 3.9 9.9 3-2
Head with vertex tawny to narrowest point between eyes, where this color is in abrupt contrast with the warm buff interocular-ocellar area. In this intersection are two conspicuous dots of dark chestnut brown, equally distant from each other and from the eyes, while just below these in the buffy area are two smaller and much more widely separated dots of the same color near the margins of the eyes; remaining portions of face warm buff washed with ochraceous-tawny. Pronotum with hexagonal disk ochraceous-orange tinged with tawny, very narrowly margined with whitish, with two medio-longitudinal parallel lines of light buff, which in length are slightly less than one-half that of the disk.'^s lateral portions transparent, very faintly tinged with buckthorn brown. Remaining portions of dorsal surface ochraceous-buff strongly washed with ochraceous-orange, a conspicuous dot of light buff mesad on the moderately large, exposed scutellum. Tegmina transparent, marginal and external two-thirds of scapular field immaculate, faintly tinged with buff, remaining portions with veins and veinlets transparent, faintly tinged with buff, the intervening areas tinged with ochraceous-orange."^" Wings transparent, washed with ochraceous-orange, this decided in area of costal veins and distad in anterior and radial fields. Ventral surface ochraceous-buff washed with ochraceous-
"^* Minute flecks of light buff, latero-cephalad of and adjacent to these lines are found, subobsolete or distinctly indicated, in the series at hand.
"*'* This pencilling as in pellucida, stronger than in lata, much less consijicuous than in tessellata. orange. Limbs light ochraceous-buff, the spines and tarsal claws faintly tinged with ochraceous-orange.
In addition, two male paratypcs, taken on the Rio Trinidad, Panama, by A. Busck, March 17 and June 3, 191 2, are before us.