LYG.ETNA. 21 



longest. Pronotum trapezoidal or quadrangular. Sternum without 

 perceptible rostral channel, the hinder margin of the metasternum 

 prolonged, more or less, over the base of the abdomen. Legs strong, 

 the thighs of the first pair mostly incrassated and armed beneath. 



Abdomen : in the $, the first four abdominal segments beneath have the 

 posterior margin straight ; the fifth segment on the posterior margin angu- 

 larly and deeply cut out in the middle, which appears raised and retracted 

 under the fourth segment ; the sixth segment long, with the posterior 

 margin straight. Genital segments. In the $, as a rule, only one is 

 visible beneath, convex and rounded. In the ? the segments are very 

 short ; above, only the 2nd visible ; beneath, on the sides, are the trian- 

 gular plates of the second segment, within them the plates of the third, 

 and in the narrow opening between these the edges of the linear plates of 

 the first segment appear. Gen. 1, Gastrodes ; 2, Plociomerus ; 3, Macro- 

 notvs ; 4, Eremocoris; 5, Dieuches ; 6, Scolopostethus ; 7, Peritrechus ; 

 8, Trapezotwtus ; 9, Pionosomus ; 10, Drymophilus ; 11, Tropistethus ; 

 12, Rkyparochromus ; 13, Hypnophila ; 14, Plinthisus ; 15, Stygnocoris ; 

 16, Acompus ; 17, Ischnodemus. 



FAMILY 2.~PHYGADICID^E. 



Head, across the eyes wider than the front of the pronotum. An- 

 tenna of nearly equal thickness throughout ; the second joint slightly 

 longest, terminal joint elongate. Eyes large, prominent. Pronotum 

 long-trapeziform. Scutellum long-triangular. Legs strong, all 

 the tliiglis stout, the first pair spined beneath ; tarsi long, first joint 

 longest. Membrane of the elytra with two basal cells. 



Abdomen. Abdominal segments in the $, first three straight on the pos- 

 terior margin ; fourth very short in the middle, lengthened angularly at 

 each side ; fifth appears on each side as an angular plate, the middle being 

 hidden under the fourth segment ; sixth greatly deflected, very long in 

 the middle, joining the third segment, extending down between the fourth 

 and fifth, and then broadly widened behind them, the centre ridged, the 

 posterior margin straight. Genital segments short ; the first appears as two 

 very short, rounded ends between the last abdominal and the third genital 

 segment ; the second as a small triangular plate at each side ; the third, 

 rounded, and with a furrow in the middle, forms the apex of the body. 

 Gen. 1, P hyg adieus ; 2, Nymts. 



