NO. 2150. SOME NEW HETEROFTEROUS HEMIPTERA—BERGROTH. 223 



brane infuscated with a broad sinuous hyaline fascia immediately 

 before the middle, and two dark brown triangular basal spot, one 

 at the inner basal angle, the other at the middle of the basal margin 

 and occupying the outer one of the two median basal cells, the outer 

 half of the basal margin also narrowly fuscous, the posterior border 

 of the hyaline fascia of a darker fuscous color than the rest of the 

 apical part. Posterior tibiae slightly curved. 



Length. — Male 6.5 mm., female 7 mm. 



Male. — Abdomen beneath bluntly roof-shaped, the segments con- 

 tracted in the middle, sixth segment as long in the middle as the 

 three preceding ones together, its apical angles rounded ; first genital 

 segment subtriangular, in the middle as long as the segments 4r-6 

 together, the broad apical margin sinuated in the middle; second 

 genital segment (=underside of dorsal genital segment) much 

 shorter and a little broader than first, strongly transverse, its apical 

 margin subtruncate; dorsal genital segment large and broad, pro- 

 truding, wide open above, covered only by the membrane, not by the 

 last dorsal segment, fuscous, the apical half (except the sides) pale 

 ochraceous, the basal angles with a brush of hairs protruding from 

 under the last dorsal segment, the apical margin subtruncate and 

 reflexed with a small recurved hook at the angles; interior append- 

 ages acutely pointed at tip. 



Female. — Abdomen beneath moderately and evenly convex, the 

 segments not contracted, sixth segment in the middle as long as the 

 two preceding ones together, its apical angles obtuse, its apical 

 margin on each side broadly triangularly produced; basal lobes of 

 genital segment subtriangidar, about as long as broad ; median lobes 

 very strongly converging, placed almost transversally, narrow from 

 the base to the middle, then triangularly dilated; the transversal 

 apical lobes confluent interiorly, consisting of the apical underside 

 of the dorsal genital segment, which is about half the length of the 

 sixth dorsal segment, with the apical margin broadly rounded. 



ry;;e.— Cat. No. 20145, U.S.N.M. Patagonia (Chubut). 



Three males and three females have been examined. The sexes 

 are constant in size and color. This insect differs from all other 

 Chilean and Patagonian Acanthosomatinae by the color markings of 

 the membrane, but these are clearly visible only when the hemelytra 

 are outspread. 



Judging from the debris adhering to the bodies of many speci- 

 mens of Patagonian Acanthosomatinae, they live under the bark of 

 rotten stubs. 



Note. — Considerable confusion prevails in the nomenclature of 

 some Chilean Acanthosomatinae, and this is chiefly due to the fact 

 that most authors in determining them have used Signoret's rede- 

 scriptions instead of Spinola's and Blanchard's original descriptions 



