1883.] BEETLES OF THE FAMILY EROTYLID^. 11 



There is a single example in my own collection ; but I am not 

 certain of the locality. 



Hybosoma. 



Genus inter Coptengem et Triplatomara quasi intermedium. 



AntenncB quam caput et thorax lorigiores, articulo teriio, quarto 



cequali ; clava longa ; oculi fere integri. Prothorax lateribus 



paidulum incrassafis, subquadratvs, bast bisinuata hand emargi- 



nata ; prosternum latum, apice truncato depresso, haud declivo ; 



mesosternum quadratum. Elytra gibbosa, apicibus subdepressis 



siibtruncatis. 



This is a genus apparently resembling Playiopisthen, differing from 



it in having much longer antennae, in the eyes being not so strongly 



margined, and the angles of the thorax in front not being so 



produced. Its nearest ally is really Coptengis, from which it differs in 



its less cylindrical form, in the eyes not having a keeled process of 



the head in front, rendering their edge emarginate, in the proportion 



of the third joint of their antennae, in the prosternum being simply 



truncate instead of its apex having two blunt lanceolate points, and 



in having strongly convex gibbous elytra. 



The prothorax is sometimes {H. striatum) wider than the elytra ; 

 the latter are four-spotted in all the species yet known to me ; and 

 these have a strong likeness to those species of Eiimorphus which 

 have unmargined elytra. I cannot at present observe the sexual 

 difference. 



I have only seen it from the Philippine Isles. 



4. Hybosoma hydropicum. (Plate XVIII. fig. 6.) 



Nigrum nitidissimum, confertim subtiliterque punctatum, elytris 

 tenuiter striato-punctatis, macula transversa humerali fasciaque 

 arcuatapone medium, nee marginem nee suturam attingente, auran- 

 tiacis, abdomine crebre haud profunde punctata. 

 Long. 15 millim. 



Hab. Philippine Isles, Bohol {Semper, Cuming, Thellandl). 

 Head, thorax, and prosternum very finely and very thickly 

 covered with fine punctures, only visible under a strong lens. 

 Thorax wide, in one example rather wider than the elytra ; the latter 

 strongly bulged and longitudinally gibbous, attenuated towards the 

 tip. Anteunse longer than the head and thorax, their club quite as 

 long as the five preceding joints. Legs long, femora not very clavate, 

 much as in Coptengis, 



5. Hybosoma striatum. 



Nigrum, nitidissimum, crebre confertim punctatum, elytris fortius 

 punctato-striatis; macula humerali fasciaque arcuata nee marginem 

 nee suturam attingente aurantiacis ; antennce thoracem vix supe- 

 rantes. 



Long. 1.5 millim. 



Hab. Philippine Isles, E. Mindanao (Semper). 



Closely allied to the preceding, perhaps not distinct ; the elytra. 



