34 
AMERICAN SPECIES OF AKADUS (IIEMIPTERa) 
Description. — Oi)aque l)laok; tliird antennal segment in apical half bright 
orange; apical angles of connexival segments and inner half of genital lobes 
with narrow' margin of dorsal genital segment at middle, reddish yellow; 
legs black, the coxae, base and snb-apical ring of femora, apex of tibiae, and 
tarsi brownish yellow; rostrum and most of ventral surface dark reddish 
brown. 
Head slightly longer than broad (40 to 38), about equal in length to pro- 
notum; tylus short, tapering in apical half; impressions of vertex deep, di- 
vergent; ]ireocular tubercles very large, conical, moderately acute; antenni- 
ferous spines rather short, slender, moderately divergent, with very small 
lateral tooth; postocular tubercles rough, prominent, acute; antennae (tig. 
4c) moderately slender, cylindrical, slightly longer than head and pronotum 
together (85 to 80), the first segment extemling well beyond middle of tylus, 
the second almost as long as width of head including eyes; rostrum extend- 
ing over anterior fourth of mesosternum. Pronotum (fig. 4d) rather flat, 
lateral margins finely and irregularly denticulate, broadly expanded and 
reflexed; carimie very strongly elevated. Scutellum elongate, triangular, 
much longer than pronotum (65 to 40); sides strongly elevated excei)t to- 
waril ajiex, nearly straight, more strongly convergent in apical fourth; a])ex 
obtuse; basal portion of disc slightly and unevenly elevated. Ilcmielytra 
( 9 ) moderately narrowed, exposing a little of abdominal disc at sides, ex- 
tending to middle of dorsal genital segment, the corium to base of fourth; 
exocorium widely and evenly expanded and reflexed at base; mesocorium and 
endocorium with one or two distinct transverse veins; membrane with very 
few cross-veins. Abdomen broadly ovate. 
cf'. Unknown. 
9 (fig. 4a). Posterior margin of dorsal genital segment straight; genital 
lobes very short, transverse, as viewed from above. Length, 11 to 11.3 mm. 
Typo speeiiiicn (Sierra, California) in the Uhlor Collection, 
U. S. N. M., No. 24078, lectotype. 
One of our largest and handsomest species, of which only a 
few specimens exist in collections. Coloration, antennal struc- 
ture, and the female genitalic characters provide ready means of 
identification. 
5. Aradus (Aradus) montanus Hergroth (Plate I, fig. 5.) 
1913. Aradus inontauus Bergroth, Can. Ent., xlv, p. 1. 
Distrihiiiion . — (iuEnnc: St. Hilaire, VI. Colou.vdo: Liaidvillc, 10, ()()() to 
11, ()()() ft., Vll, 7 to 14, 1896 (H. E. Wickham). 
Description . — Black or brownish black. 
Head as long as broad, slightly longer than pronotum (32 to 29); lylus 
raflua' short, enlarged toward base; impressions of vc'rtc'x short and broad, 
rather shallow, parallel; i)reocular tulx'rcles very small, obtuse; anfenni- 
ferous spines short, evenly (H)nical, moderately divergent, with distinct lat- 
eral tooth; i)ostocular tubercles prominent, acute; antennae (fig. 5c) moder- 
