20 
AMERICAN SPECIES OF ARADUS (hEMIPTERa) 
Granulation of head smooth; length of second segment at least equal to 
width of head including both eyes; sides of pronotum slightly arcuate, 
with very fine irregular teeth; form broad 20. basalis sp. nov. 
31. Vertex finely and evenly granulate; lateral expansions of pronotum 
moderate, very narrow anteriorly, scarcely reflexed. 
23. persimilis Van Duzee 
\"ertex with two rows of coarse granules; lateral expansions wide, con- 
tinued more broadly to anterior angles, somewhat reflexed 32 
32. Lengtli of second antennal segment equal to head width including one 
eye; marginal teeth of pronotum large and irregular. 
24. medioximus sp. nov. 
Length of second segment equal to head width including both eyes; 
marginal teeth small and even 25. vadosus Van Duzee 
33. Length of second antennal segment about equal to distance between 
eyes, rarely slightly greater 20. similis Say 
(a) Vhird antennal segment yellowish except at base; membrane 
hyaline, often faintly maculated; apical angles of connexival 
segments jiale variety similis tyfiical 
(b) Third antennal segment concolorous; membrane dark with 
pale liasal sjiot, rarely entirely pale; general coloration nearly 
uniform light to dark brown. 
variety centriguttatus Bergroth 
Length of .second antennal .segment at least eiiual to head width including 
one eye 34 
34. Second anfennal .segment not or scarcely three times as long as third. 
35 
Second segment distinctly more than three times as long as third 37 
35. Rostrum extending to muklle of jiro.sternum; second antennal segment 
about twice as long as third; antero-lateral margins of pronotum 
straight, oblique 29. opertaneus sj). nov 
Ro.strum e.xtending to meosternum; .second antennal segment more than 
twice as long as third; sides of jironotum arcuate 30 
30. Golor grayish, with obscure yellowi.sh markings and a distinct ]iattern 
of ])ale granules; sides of pronotum with a few large teeth anteriorly; 
second antennal segment strongly clavate, its length equal to head 
width including both eyes 32. acutus Say 
Color bl.ack; pronotal margins with numerous fine teeth; second an- 
tennal segment moderately clavate, shorter. 
31. shermani Ileidemann 
37. Second antennal segment gradually enlarged from near ba.se tkS 
Si'cond segment cylindrical from base to near middle, strongly enlarged 
m apical third (fig. 3()c) 3ti. approximatus sj). nov 
3S. S(‘cond antennal .segment nearly cylindrical beyond middle, sometimes 
very slightly (Milargcsl at apex; third segnumt more slimder than second 
at middle (fig. 35c); grayish gramih's of dorsal surface di'iise. 
35. hesperius sp. nov. 
