40 
AMERICAN 8PECIES OF ARADUS (HEMIPTERa) 
15. Aradus (Aradus) apicalis Van Duzee (Plate 11, fig. 15.) 
1920. Aradus apicalis Van Duzee, Proc. California Acad. Sci., (4), ix, p. 331- 
DislribuHott . — C.\lifoknia: Fallen Leaf Lake, Eldorado County, VI, 25, 
1915 (E. P. Van Duzee); Millwood, Fresno County; Lake Tahoe, VI, 10, 
1(S91; Sununerdale, VI, 12, 1906 (11. E. Burke). 
Description. — V'ery dark brown; base of hemielytra in large part excei)t 
lateral margin and clavus, apex of scutellum, narrow jmsterior margins of 
connexival segments, and inner margins of genital lobes, yellowish; veins 
of membrane but slightly marked with white; rostrum and legs jjale, the 
femora and tibiae with a broad, indefinite darker band at middle; ventral 
surface of abdomen reddish brown on disc. 
Head nearly as broad as long, slightly longer than jjronotum (30 to 27); 
tylus slightly enlarged ventrally at middle; impressions of vertex elongate, 
l)arallel; preocular tubercles well developed; antenniferous spines very stout, 
divergent, without lateral tooth; postocular tubercles low, rounded; antennae 
(fig. 15c) moderately robust, as long as head and pronotum together, the 
first segment reaching middle of tylus, the second slightly longer than dis- 
tance between eyes (21 to 19 j; rostrum scarcely reaching middle of meso- 
sternum. Pronotum (fig. 15<1) moderately flat, the lateral margins finely 
and irregularly granulate, strongly reflexed; carinae very strongly elevate<l. 
Scutellum much longer than pronotum (37 to 27), elongate, triangular; 
sides very strongly elevated; ai)ex narrowly rounded; basal fourth sharply 
elevated. Hemielytra (d’) extending to base of genital lobes, (9) just 
beyond base of dorsal genital segment; narrowed from base to apex exjiosing 
disc of abdomen at sides; coriuin not quite reaching apex of fourth connexi- 
val segment; exocorium strongly expanded at base; the mesocorium with 
one, the endocorium without distinct transverse veins; membrane narrow, 
its sides i)arallel, rounded at apex, with few cross- veins. Abdomen oval, 
somewhat broader in the female, the lateral margins entire. 
cT (fig. 15b). Fifth ventral segment about as long as sixth; genital seg- 
ment rather short and moderately convex. Length, 5.7 mm. 
9 (fig. 15a). Posterior margin of dorsal genital segment very slightly 
sinuate. Length, 6.5 mm. 
Type specimen (Fallen Leaf Lake, California), No. ()79, (’ali- 
fornia Academy of Heienees. 
This rai'e species, described from a sin<>:le specimen, is most 
closely I't'laled to duzeei, from which it differs in pronotal and 
(‘specially genitalic sti’uctnre. A g;lance at the g;enital 1o1h‘s is 
snlHcient to sejiarate it from allied species. As noted al)ove, 
lleidemann confused this form with duzeei. 
