A470 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95: 
Family ACHILIDAE 
9a. Vertex very short, much broader than long, anterior margin straight. 
Subfamily APATESONINAE 
Genus ATESON Metcalf 
Ateson METCALF, Bull. Mus. Comp. Zool., vol. 82, p. 369, 1988. (Genotype, Ateson 
marmoratum Metealf, ibid. p. 370.) 
Vertex short, about five or six times as broad as long, anterior margin 
straight; frons longer than broad, lateral margins subparallel, scarcely 
wider at level of antennae than at base, raised, forming a percurrent. 
flange with raised margins of clypeus, disk of frons between raised 
lateral portions flat, median carina present, rather feeble, percurrent; 
antennae with second segment short, cylindrical, expanded at apex. 
Pronotum short, with median and lateral carinae, the latter diverging 
posteriorly; mesonotum tricarinate, with disk ovate, tegulae large. 
Tegmina tectiform, costal and commissural margins subparallel, mem- 
brane expanded beyond apex of clavus, apical margin bluntly rounded. 
Sc weak, with several branches to margin at apex, R simple as far’ as 
transverse line of cross veins, M with six or seven branches before 
transverse veins, Cu, forking at level of junction of claval veins, claval 
veins uniting about three-quarters from base, and joining truncated 
apex of clavus. Posttibiae unispinose. 
ATESON CONSIMILE, new species 
PLATE 13, FicuRES 330-335 
Female: Length, 4.8 mm.; tegmen, 7.1 mm. Length to apex of 
tegmen, 8.0 mm. 
Vertex five times as broad as long in middle; frons with median 
carina distinct, strongly so apically, but very feeble, and transversely 
notched, at extreme base; clypeus broadly tumid in middle, devoid of 
median carina. Pronotum in middle as long as vertex on the same 
line, a small callosity present on each side, carinae distinct; mesono- 
tum with disk exactly twice as long as wide, tricarinate, median carina 
raised into a vertical flange, shallowly curved in profile. Tegmina 
with two small cells at apex of Sc, with a small elongate triangular 
cell basad of them on costal margin, R simple to apex, M with seven 
branches reaching apex, both branches of Cu, simple to apex, sub- 
apical line of transverse veins complete to hind margin near anal angle, 
the vein joining R and M very short, reduced to a thick spot between 
' the almost contiguous veins; tegmina finely rugulose between veins.. 
Vertex testaceous, fuscous near lateral margins, frons testaceous, — 
lateral basal angles fuscous, a fuscous band at margins, narrowly 
bordered piceous on inner edge distad of level of antennae, clypeus 
