204 ON NEW SPECIES AND GENEEA OE EUMOLriDiE. 



Oil the hinder half, and on the whole of the outer disk, nitidous, 

 sparingly impressed with a few minute punctures. Prosternum 

 constricted anteriorly, its hinder half abruptly dilated. All the 

 thighs armed beneath with a short tooth. 



Grenus Jansonius, n. gen. 



Corpus anguste ovatum, convexum, squamulis adpressis brevibus vesti- 

 titum. Caput modice exsertum, facie brevi, perpendicular! ; oculis 

 subrotuudatis, intus leviter sinuatis ; antennis corporis dimidio fere 

 Ecquilongisj articulis ultimis quinque incrassatis. TAoraa; transversus, 

 convexus. Scutellum semiovatum. iJZ^/^'"^ thorace latiora, punctato- 

 striata. Fedes modice robusti ; femoribus posticis subtus spina acuta 

 armatis ; tibiis posticis quatuor extus ante apicem emarginatis ; un- 

 guiculis appendiculatis. Prosternum planum, basi et apice araplia- 

 , tum, lateribus subprofunde sinuatis ; episterno antico margine apicali 

 kviter convexo, angulo externovix ad thoracis angulum anticum pro- 

 ducto, angulo antero-interno libero. 

 Type Jansonius alternates. 



Nearly allied to Faclinephorus, separated from that genus by 

 the more ovate form, the entirely difierent shape of the thorax, 

 and by the much less convex and less produced anterior border 

 of the prothoracic episternum. 



Jansonius ALTERNATUs,n. sp. Ovatus, convexus, cupreus, uitidus ; 

 antennis nigris, his basi, femoribus basi, tibiis apice tarsisque piceo- 

 rufis ; thorace lateribus subangulatis, disco distincte punctato, punctis 

 hie illic irregulariter congregatis ; elytris thorace latioribus, convexis, 

 pone medium squamulis brevissimis suberectis albidis parce vestitis, 

 distincte (ad basin fortius) punctato-striatis, striis per paria approxi- 

 raantibus, interspatiis minute granulosis, alternis latioribus nitidis. 

 Long. H lin. 

 Eah. Chili. 



Head granulose, rather closely punctured, clothed with ad- 

 "pressed, white, scale-like hairs ; upper portion of front impressed 

 with a deep fovea ; labrum and jaws piceous ; four lower joints of 

 antennae pale rufo-piceous, the basal one stained above with piceous, 

 seven outer joints black, the five upper ones distinctly thickened. 

 Thorax broader than long ; sides moderately rounded, very ob- 

 tusely angled in the middle ; upper surface convex, very minutely 

 granulose, impressed with round shallow punctures, which are 

 crowded into large irregular patches on the surface. Scutellum 

 pentagonal, its apex acute. Elytra much broader than the thorax, 

 broadly oblong-ovate, convex, each elytron with a shallow exca- 



