220 FROCEEDINUS OF TLIE NATIONAL MUSEUM. vou 51. 



evaporative area extremely small, hardly visible, forming a very 

 narrow stripe bordering the anterior and posterior margins of the 

 orificial prolongation which is a little curved behind and distinctly 

 shorter than the distance between its tip and the lateral margin of the 

 metapeiira. Hemelytra (male) slightly passing apex of abdomen; 

 corium rather finely and thickly pimctate, its costal margin roimdedly 

 angular a little before the middle, its apical margin slightly rounded 

 or almost straight. Abdomen (male) beneath roof-shaped but not 

 carinate in the middle, very superficially and remotely concolorously 

 punctate, the apical angles of the segments slightly and obtusely 

 prominent, not distinctly tuberculate, apical angles of the last seg- 

 ment rounded; first male genital segment with the broad apical 

 margin slightly sinuate in the middle, second genital segment broader 

 than the first but only half its length, the apical margin rounded and 

 trisinuate. 



Length. — Male, 8 — 8.5 mm. 



Type.— Cat. No. 20144, U.S.N.M. Patagonia (Chubut). I have 

 seen numerous males but no female of this species which is smaller 

 than L. 7mgosus Signoret, and differs from it by the longer basal 

 joint to the antennae. The more strongly rounded posterior part of 

 the anterolateral pronotal margins, the shorter orificial prolonga- 

 tion, the less prominent and less tumid apical angles to the ventral 

 segments, the darker, more uniformly colored corium, the differently 

 colored legs, and the smoother, red-speckled venter, the segments of 

 which are black at the basal angles, not at the apical angles as in 

 rugosus. From L. ehuhutl Distant it differs by the much longer 

 second joint of the quite differently colored antennae by darker mem- 

 brane, and smaller size. 



As Distant says that L. chuhuti is larger than rug&sus, I suppose 

 he has not seen the true rugosus from Chile, which is of the same size 

 as chuhuti. Distant and some other British authors treat Chubut as 

 the name of a collector, but it is the name of the central province of 

 the Patagonian part of Argentina, between the Rio Negro territory 

 in the north and the Santa Cruz territory (Patagonia proper) in 

 the south. 



EA AUSTRALIS Distant. 



Distant's descriptions of this genus and species, and of his other 

 South American Acanthosomatinae, are generally good, yet a few 

 additions and corrections to his description of this insect are neces- 

 sary. The veins of the membrane are very few in number and more 

 or less anastomosing near base. The rostrum scarcely passes the 

 middle coxae. The orificia are only as long as the trochanters, not 

 "as long as coxae and trochanters together." The venter is con- 

 colorously punctate, the fifth and sixth segments in the female on 



