1897.] OF THE FAMILY ENDOMTCHID.^. 457 



below the acute and prominent front angles, and contracted from 

 the middle to the hind angles, which (as the base is sinuate) are 

 also acute ; the basal sulci are parallel to the oblique and con- 

 tracted sides, and are continued as a kind of depression above the 

 middle ; the sides are neatly margined and a little reflexed ; the disk 

 has two blunt tubercles, one on each side of an obsolete central 

 channel. The elytra are shining near the suture, rather opaque 

 at the shoulders and sides, with large irregularly dispersed punc- 

 tures, in twos and threes, and become roughly seriate near the 

 sutiu"e. The humeral callus is elevated into an arcuate ridge 

 which projects beyond the margin ; the basal tubercle is slightly 

 ridged and is faintly pitchy at its summit ; the discoidal one is 

 nearer the base than the apex and is pitchy red in the middle, it is 

 gradually and not suddenly elevated. The apical yellow pustule 

 has just a trace of one or two obsolete punctures, it is translucid. 

 The elytra are a little expanded at the margins and pointed at 

 the apex ; their texture is pitchy black, and may be likened to 

 caoutchouc. On the underside the only part which exhibits punc- 

 tures is the intercoxal process of the first abdominal segment, which 

 is deeply and coarsely punctured. The prosternum is coarsely 

 formed, its process bluntly bimucronate. Mesosternum with the 

 raised and margined intercoxal part transversely pentagonal '. 



I have described this species at some length, as with A. rude- 

 2')unctatus, here described, it belongs to a section of Amiihisternus 

 little known, and which I believe forms the genus ffajDlomorj^hus, 

 Guerin. 



AMPHISTEEinJS RUDEPUNCTATtTS, n. Sp. 



Brevior, jprotJiorace lato, elytris breviter ovatis gibbosis ; niger, 

 subopacus, proiliorace lato lateribus rotundatis postice parum 

 angustatis, angulis anticts pariim prominulis ; elytris sub- 

 cordatis, gibbosis, grosse seriatim jjunctatis, antennarum articulo 

 apicali, palpis tarsisque rufo-piceis. Long. 7'5 millim. $ . 

 Hab. Assam, Patkai Mountains (Doherty). 



Thorax very wide, the sides much rounded, the front cut out in 

 an arc, but not so deeply or widely as in A. verrucosus, the surface 

 very uneven and very obsoletely punctate ; the base very wide, a 

 little sinuous, not margined ; the sulci and central channel very 

 obsolete, the transverse basal line very distinct. Elytra much 

 wider than the thorax, without tubercles, a little expanded towards 

 the margins ; the apex and humerus nearly free from punctures 

 but opaque. Underside shining, glabrous; epipleurse very wide 

 at their bases. 



A single female example of this rather extraordinary Am- 

 pJiisternus is in Mr. Fry's collection ; it is entirely black, with 



1 Obs. — This portion is generally but incorrectly referred to by authors as 

 though it were the mesosternum. There is a considerable part forming two 

 branches, and partly enclosing the coxae, in front of this ; and this portion 

 is carinate in Ampkisterni, the carina being received between the points of 

 the divided prosternal process. 



