SUBFAMILY I. — ARADIN^. 303 



summer found beneath bark of oak, ash, elm and other trees, 

 and also about the wooden fungi of birch and maple. On March 

 20 I once found in Marion County, a large colony beneath the 

 bark of an ash stump. The females were infested with a mite 

 which was attached beneath the wings, causing the latter to 

 bulge upward. This mite was described by Banks (Canadian 

 Entomologist, XXXIV, 1902, p. 172) as Cheyletus clavispinus. 

 The known range of si mil is is a wide one, extending from Nova 

 Scotia and New England west to Wisconsin and Kansas, and 

 southwest to Georgia, Florida and Texas. In Florida it is rep- 

 resented almost exclusively by the southern race. The A. 

 fascicornus Walk. (1873, 36) is a synonym. 



229a (371a). Aradus similis centriguttatus Berg'roth, 1887, 246. 



This differs from typical similis in being nearly uniform dark black- 

 ish-brown, in all the joints of antennae being dark and the connexival 

 segments with only a trace of yellow at the angles. 



Very common in central and southern Florida, where it oc- 

 curs in colonies of all stages during the winter and spring 

 months, beneath bark of pine and water oak that have been 

 felled about a year. Also taken occasionally by sweeping and 

 beating. The membrane of the elytra, as in some other Aradids, 

 is sometimes almost a uniform whitish hyaline in hue. Parsh- 

 ley states that this form occurs in the northern states, but in 

 all my collecting I have never taken a specimen in Indiana as 

 dark as those in Florida. 



230 (375). Aradus acutus Say, 1832, 28; I, 351. 



Elongate-oval. Blackish-brown ; a row of subquadrate spots each 

 side of exposed disk of abdomen, and also the apical angles of each con- 

 nexival segment, whitish; basal expansion and veins of corium, and 

 disk of genital segments in part yellowish; antenna? and beak black; 

 legs blackish-brown, the tibiae paler. Head longer than wide, longer 

 than pronotum; tylus cylindrical, obtuse; antenniferous spines slender, 

 acute, distinctly divergent; impressions of vertex narrow, deep, sub- 

 parallel ; antennae with second joint clavate, nearly three times as long 

 as third, the latter but slightly longer than fourth; beak reaching mid- 

 dle of mesosternum. Pronotum with side margins rounded, moderately 

 flattened, feebly reflexed, their hind edges irregularly crenate, front 

 ones with a few longer teeth; disk with transverse impression distinct, 

 carinae moderately elevated, not reaching front margin. Scutellum wide, 

 subpentagonal, its sides subparallel to middle, thence converging to the 

 narrowly rounded apex; margins feebly elevated. Basal expansion of 

 corium narrow, broadly curved, its edge crenate. Connexivum fully ex- 

 posed, as are also, in part, the sides of abdominal disk. Male with fifth 



