Exotic Bhynchota. 151 



border is a sub-marginal strongly indented black line ; near 

 frontal margin, on each side of central fascia is an irregular 

 darker patch enclosing a small luteous space. Scutellum 

 purplish, with the basal angles narrowly, and a central 

 longitudinal fascia continued from that of pronotum, and 

 apex broadly luteous. Corium purplish, with basal margin, 

 radial suture for half its length from base, and apical 

 margin luteous. Connexivum luteous, with base and apex 

 of each segment black. Abdomen above reddish ; mem- 

 brane dark, brassy, shining ; underside of body and legs 

 luteous ; apices of femora, tibias, and the tarsi purplish ; 

 stigmata black ; abdomen centrally and longitudinally 

 sulcated. 



Long. 22 millims. Max. lat. 12 millims. 



Hab. Torres Straits. 



Allied to O. sulciventris, Stal., but differs from that 

 species in having the abdomen sulcated in both sexes. 

 The colour is also very different, and fourth joint of the 

 antenuEe black, and not concolorous, as in 0. sulciventris. 



Plisthenes dilatatus. Montr. 



Tesseratoma dilatatum, Montr, Ann. Sciene. phys. Ser. 

 2, vii. i. p. 100 (1855). 



Oncomerus dilatatus. Voll. Faun. ent. ind. Neerl. 

 iii. p. 32, 4 (1868). 



Stal. (En. Hem., i. p. 63) considered this species as a 

 variety only of P. meriance, Fab. Volleuhoven describes 

 it as being generally smaller than that species. I have not 

 been able to find agreement with either of these authors. 

 A specimen of P. dilatatus which I possess, from near Fort 

 Moresby, is considerably larger than specimens of P. me- 

 riance c? and ? , which I have received from the same 

 locality and from Murray Island. These last agree with 

 the Australian varieties described by Stal., having the last 

 two joints of the antennae luteous, the base of the third 

 being black. The antennse will, however, I think separate 

 these forms. 



Antennae with the second joint shorter than the third. 

 Abdomen beneath, with a central piceous longitudinal 



fascia P- meriance. 



Antennae with the second and third joints sub-equal. 

 Abdomen beneath, with a central and two sub-marginal 

 longitudinal fasciae P. dilatatus. 



TEANS. ENT. SOC, 1880. PART III. (OCT.) M 



