22 
AMERICAN SPECIES OF AKADUS (hEMIPTERA) 
eyes stron^’ly projecting, sonietiines almost pedunculate; ocelli 
absent; first antennal segment short and thick, suddenly con- 
stricted at base to form a short olilique stem; bucculae very 
short, situated anteriorly; rostrum usually extending beyond liase 
of head; rarely (subgenus Quilnus) shorter. Legs of moderate 
length, homonomous; the trochanters small and scarcely sep- 
arated from the femora; tarsi two-segmented. Hemielytra com- 
posed of coriuni, clavus, and membrane, the last well differenti- 
ated and distinctly veined; pterygo-polymorphism frequent. 
\'entral transverse sutures of abdomen mostly angulate; spiracles 
distant fi-om lateral margins, near basal. 
Tyjie and only genus . — Aradus Fabricius. 
Genus ARADUS Fabricius 
1803. Aradus Fabricius, iSyst. Rhyng. j). 116. 
Flattened ovate or elongate-ovate species with surface more 
or less roughly granulate. Tylus forming an entire, obtuse, 
subcylindrical or laterally flattened lobe; a small sihne or tubercle 
placed anteriorly and obliquely inward near the eyes, more or 
less strongly developed, and usually one behind the eyes; ver- 
tex with a variously developed, usually U-shaped impression. 
Pronotum transverse, with six longitudinal carinae, the lateral 
jiair much abbreviated. Scutellum large, roughly triangular or 
IKUitagonal, the margins and base usually elevated. ITemielytra 
usually shorter and narrower than abdomen, sometimes strongly 
ablireviated or narrowed, the memlirane usually with four longi- 
tudinal veins and a vaiying number of irregularly anastomosing 
cross-veins. C’onnexivum widely dilated. Male genital segment 
large, convex and partially divided ventrally, bearing nearly 
horizontal genital lobes posteriorly; female with two visible 
genital si'gments, conqiletely divided in the median line and, 
with the similarly divided median portion of the sixth ventral 
segment, foi'ining movable valves; the first bearing postero-lati'ral 
gmiital lobes jiartly visibh' from abovi', the second much smalU'r, 
tiM'minal, and generally not visibk' IVom above. 
Uyp(' sjM'cies. — ('ducx hclulde LiniKunis. 
