214 Mr. G. Lewis on new Species of Histeridse. 



This species is fashioned above like a small specimen of 

 9-costatuSj but the mesosternum is without foveas and the 

 metasternum has a transverse semicircular furrow which divides 

 about one sixth of the surface from the posterior portion, 

 and the suture between the latter and the first segment of 

 the abdomen is indicated by a somewhat deep sulcus. The 

 margin of the prosternal lobe is narrowly testaceous. 



Idolia, nov. gen. 



Corpus perconvesum, fere orbiculare, nigro-piceum, nitidum. Caput 

 retractum ; fronte triangulari, margine elevate ; mandibulis 

 robustis. Antennse sub frontis margine insertae, fossa nulla, 

 scapo magno, funiculi articulo primo longiore, 3-8 sequaHbus, 

 clava abrupta ovali compressa 3- vel 4-articulata. Pronotum an- 

 tice angustatum, basi latum, stria marginali Integra. Scutellum 



. triangulare. Elytris striis dorsalibus nullis. Presternum latum, 

 lobo latissimo, marginato, basi truncate. Mesosternum antice 

 non sinuatum, a metasterno baud distinctum. Propygidium trans- 

 versum perpendiculare ; pygidium inferum obliquum. Pedes poste- 

 riores valde distantes ; tibiis minute denticulatis. 



This genus has some of the characteristics of Sphcerico- 

 soma ; it dififers in having a large scape to the antenna and 

 in the great breadth of the lobe of the prosternum, which is 

 without fossettes and widens out to the lateral edges of the 

 thorax. Viewed from beneath the head cannot be seen when 

 in a state of repose, and the anterior structure then presents 

 the outline of a semicircle. Examined sideways there is seen 

 a deep cut in the anterior angle of the thorax between the 

 thoracic stria and the edge of the prosternal lobe for the recep- 

 tion of the antenna and part of the head, but this cavity cannot 

 be seen from above. The antennge are drawn in with the 

 head, and during repose rest with it within the thorax. The 

 pygidium is beneath as in Notodoma, is semicircular at the 

 apex, and somewhat transverse at the base. The peculiar 

 structure of the thorax and the absence of true antennal 

 fossettes, and the construction of the meso- and metasterna 

 without apparent sutures, seem to indicate that the genus is 

 one of a low type, and it may be placed therefore after 

 JEletes. 



Idolia laevigata^ n. sp. 



Orbicularis, convexa, picea, nitida, pedibus antennisque dilutioribus ; 

 supra Isevis ; fronte subtilissime strigoso-rugosa, margine elevato ; 

 pronoto stria marginali Integra, basi arcuato, antice utrinque 

 obtuse augulato; elytris tenuissirae marginatis ; prosterno minute 



