Ischnoptera gatunae Hebard 1920

Ischnoptera gatunae^^^ new species (Plate IV, figure 11.)
The present species belongs to a group of elongate, light brown forms, having the latero-caudal sulci of the pronotal disk well developed and in some of the species distinctively colored. This group we would call the Gatunae Group; it apparently follows the Rufa Group and precedes the Apolinari Group in linear position, the latter coming before the second section of the genus, which includes a number of groups of relatively much smaller species.
i°i For a discussion of this material and the variability of this race, see Hebard, Trans. Am. Ent. Soc, xlii, p. 354, (1916).
'"^ The material of this species was taken on the Rio Trinidad, in an area now Hooded by (iatun Lake. When compared with a female of /. bergrothi (Griffini),!''-'' fg_ males of this species are found to differ in the narrower interocular space (.5 instead of .7 millimeter in width) and pronotum with disk largely sufTused, latero-caudal sulci not distinctively colored and caudal marginal portion transparent. We feel satisfied that when the male sex of bergrothi is found, further distinctive features in the genitalia will be noted.
Type. — cT ; Rio Trinidad, Panama. March 7,1912. (A. Busck.) [United States National Museum.]
Size medium large, form slender. Interocular space narrow (.3 millimeter), about one-third as wide as that between antennal sockets, four-fifths as wide as interocellar space. Ocelli large and distinct, flattened surfaces of ocellar areas forming a moderately sharp angle with interocellar area. Maxillary palpi moderately short; fifth (distal) joint very slightly longer than third. Latero-caudal sulci of pronotal disk pronounced. Tegmina and wings extending beyond apex of abdomen nearly twice the cereal length. Tegmina elongate and narrow, with portion of dextral tegmen, concealed when at rest, transparent though slightly suffused. Dorsal surface of abdomen specialized as is characteristic of the genus. '"^
Supra-anal plate trapeziform produced, with latero-caudal angles rounded and margin between transverse; feebly and irregularly subchitinous in a small median area, just dextrad of which the ventral surface of the plate is produced ventrad in a thick heavy plate with apex rounded.
Paired plate beneath supra-anal plate specialized on each side, the dorsal chitinous arms, of which the dextral is much the longer, each armed with a distal spine; beneath the sinistral of these is a heavy lobiform plate which is heavily spined dorsad, while dextrad is a large chitinous lobe covered with elongate hairs. Titillator very similar to that of /. riifa occidentalis Saussure (plate IV, fig. 9).
Subgenital plate hairy, strongly asymmetrical, surface convex except in produced portion, where it is moderately concave; dextral portion of free margin strongly convex to brief median portion of plate, which is weakly triangularly produced ; the dextral style at the apex, about twice as long as basal width. tai)ering slightly to its rounded apex, which is covered dorsad with minute teeth, this style directed sinistrocaudad, so that its dextral margin is an almost even continuation of the dextral margin of the produced portion of the plate; sinistral margin feebly convex, then feebly concave to median produced portion, at the base of which is situated the very small sinistral style, suboval, straight, supplied in distal half of sinistral face with minute teeth, about three-quarters as long as dextral style and situated at a distance from it of slightly less than its own length.
103 Ye have two Costa Rican females, apparently of that species, described from a single female from Punta de Sal)ana, Darien, (Panama). '"^ Described; Mem. .m. Hnt. Soc, 2, p. 62, (1917).
Limbs and armament of same as characteristic for the genus. First four caudal tarsal joints supplied distad with moderately well developed simple pulvilli. Small arolia present.
Allotype. — 9 ; same data as type, but taken March 23, 1912. [United States National Museum.]
This sex differs from the male in the following characters. Size slightly larger, form broader but still very slender for the genus. Interocular width (.5 millimeter) slightly less than that between the ocelli, slightly more than half the width between the antennal sockets. Ocellar areas as sharply defined but angle with interocellar area not as sharp. Tegmina and wings proportionately fully as elongate as in male. Supra-anal plate one-half as long as basal width; lateral margins straight and moderately convergent to mesal third between cerci, there the plate is produced with margins feebly convex convergent to the blunt apex. Subgenital plate moderately convex, very broad, with free margin evenly and broadly convex.