98 The Philippine Journal of Science isis 



of the head in its whole length, the apical part always being 

 considerahly distant fronn the head. Pronotum almost trapezi- 

 form, much broader than long, not or very obscurely transversely 

 impressed, a little narrowed from base to apex, where it is a 

 little broader than the head, apical margin straight, apical angles 

 with an exserted seta, lateral and basal margins not depressed, 

 almost straight or very slightly rounded. Scutellum scarcely- 

 convex. Clavus with three rows of punctures, the commissure 

 less than half the length of the scutellum; corium with the 

 straight apical margin shorter than the claval suture, 7-adial vein 

 in its apical half deviating from the costal margin, ending 

 abruptly somewhat behind middle of corium, exocorium and mes- 

 ocorium, owing to the shortness of the radial vein, broadly con- 

 fluent in their apical parts; membrane with a deeply impressed 

 transverse fold near the base, the next inmost vein curved very 

 strongly inward in its basal part. Fourth ventral segment with 

 three sublateral, glandular spots, the hindermost of which is 

 placed near the posterior margin. Front femora in both sexes 

 a little incrassated, in their apical half armed with two very shoH 

 and fine spinules; middle and hind tibiae with scattered bristlelike 

 spines ; hind tarsi more than half the length of tibiae, first joint 

 about twice the length of the others combined. 



Type of the genus, Ptychoderrhis bipunctata sp. nov. 

 The characters distinguishing this genus from either Antillo- 

 coris Kirk, or Tropistethus Fieb., or from both these genera, 

 are printed in italics. 



To this genus also belong Aphanus indicu^ Dallas, Tropistethus 

 antennatu^ Scott, and Tropistethus simulant Distant. Distant 

 has also referred the first-mentioned of these three species to 

 Tropistethus, but they cannot be confounded with this Palsearctic 

 genus, in which (apart from other important differences) the 

 pronotum is distinctly bilobed and laterally sinuate and in 

 which the forelegs are sexually highly different in structure, 

 whereas they are identically constructed in both sexes of 

 Ptychoderrhis. The new genus seems to be more related to 

 Antillocoris , in which, however, the body is broader and more 

 oval and the pronotum subcampanulate, its lateral margins be- 

 ing strongly (and usually broadly) rounded anteriorly, gradually 

 passing into the apical margin so that the pronotum at the apex 

 is considerably narrower than the head. Furthermore the 

 throat is straight in Antillocoris, permitting the first rostral 

 joint to be strictly applied to it in its whole length, and the 

 radial vein of the corium is percurrent (although sometimes 

 weaker toward the end) and subparallel to the costal margin. 



