CORDYLIGASTER.—CHATONA. 253 
more sharply limited, and the insertion of the posterior cross-vein more remote from 
the middle between the small cross-vein and the curvature of the fourth vein. 
CHAETONA, gen. nov.* 
Front scarcely prominent, narrowed behind in the male; frontal bristles weak, descending as far as the end of 
the second antennal joint; two bristles on the vertex more robust; face nearly perpendicular, not 
carinated; oral margin not prominent; cheeks bare, rather narrow; vibrissal swellings very slightly 
convergent ; vibrisss inserted at a short distance above the oral margin. Eyes large, elongate-oval, bare, 
descending to near the lower part of the head. Antenne elongate, slender, inserted above a line drawn 
through the centre of the eyes; third joint longer than the second ; arista unusually long, short-plumose. 
Proboscis short and thick; palpi cylindrical, Abdomen elliptical, the first three segments of equal length, 
the anal segment shorter. Legs of moderate length, the front and middle tarsi longer than the tibie ; 
foot-claws and pulvilli elongate in the male; bristles of the legs weak. Tegule large. Wings longer 
than the abdomen ; apical cell opened a little before the wing’s tip; curvature of the fourth vein rounded ; 
posterior cross-vein beyond the middle between the small cross-vein and the curvature of the fourth vein. 
1. Cheetona longiseta. (Tab. VI. figg. 8; 8a, head.) 
Dexia longiseta, Wiedem. Aussereur. zweifl. Ins. ii. p. 381. no. 22. 
Greyish-white; thorax with black stripes; abdomen yellowish, with white front borders and black hind 
borders to the segments and with a black dorsal stripe; antenne black; legs piceous ; palpi rufous; 
’ wings brownish. 
Length 7:5 millim. 
Head whitish; frontal band blackish-brown ; antenne black; arista, except its thickened part at the base, 
short-plumose over its whole length; proboscis black; palpi pale rufous. Thoracic dorsum before the 
transverse suture with four distinct black stripes of nearly equal breadth, behind the suture a large black 
spot; scutellum blackish at the base. Abdomen pale yellow, the base, a dorsal stripe, and the hind 
borders of all the segments black ; the front borders of the second and following segments white; marginal 
macrochete are conspicuous, and on the second segment there are indications of discal ones (perhaps they 
are broken off). Legs piceous, with scattered bristles; foot-claws and pulvilli elongate, the pulvilli 
yellowish. Tegule pale yellow. Wings with a brownish tint, which is more intense on the apical half 
beyond the small cross-vein, but obsolete again towards the wing’s tip; small cross-vein on the middle of 
the discal cell; apical and posterior cross-veins slightly curved. 
Hab. Costa Rica, Caché (Rogers).—Bnaziu. 
A single male specimen. 
Not only is the description of Wiedemann, though founded on a somewhat damaged 
example, fully applicable, but the identity is stated by Professor Brauer, who has 
compared the Costa Rican insect with the typical specimen in the museum of Vienna. 
2. Chetona congrua, sp. n. (2 2). 
Agreeing with C. longiseta, but differing by the thoracic stripes being united two and two; wings grey, only 
slightly infuscated towards the tip. 
Length 5 millim. 
Besides its smaller size and the above-mentioned differences (the thoracic stripes forming two broad black 
bands), this species may be distinguished from the preceding by a less prominent front, the non-elongate 
foot-claws and pulvilli, and the nearly straight posterior cross-vein. 
Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H. H. Smith). 
* yairn, bristle (arista). 
