TRICHALUS. 71 



This differs from 2^<^>'ttirhatKs in having the autennao less linear — 

 that is, they are rather broader and the joints are more dentate. 



Trichalus niger. 

 (Plate XYII. fig. 8.) 



Totus nigcr, opacus ; thorace transverse, lateribus ante basin 

 parum angulatis; elytris striarnm pnnctis subi^uadratis, $. 



Long. -1 lin. 



Bab. Java (J. 0. Boivriwj, Esq.); Banda (Wallace). 



Entirely dull black; the thorax slightly transverse, gently re- 

 flexed at the sides, which are somewhat angular before the base ; 

 the posterior angles are a little less than right angles ; the anterior 

 border is obscurely punctured ; there is a rather well-marked round 

 impression within each posterior angle. The first strong costa is 

 joined by its two fine companions at not more than one-sixth the 

 length of the elytra ; the punctures in the lines are generally square, 

 but they are very irregular. 



There is a male example from Aru Island, which I think may 

 prove to be distinct from T. niger ; the thorax is more I'ounded iu 

 front, the posterior angles more diverging ; the elytra have the fine 

 lines dividing the rows of punctures almost wanting, and the strong 

 costoe are more developed. 



Trichalus communis. 

 (Plate XVII. fig. 9.) 



Fuscus ; thorace trapezoidali, sordide flavo marginibus punctatis ; 

 scutello medio infuscato ; elytris flavis, apice infuscato ; coxis 

 flavis. $ . Long. 3^-1 lin. 



Hah. Java (./. C. Bowrinr/, Esq.). 



Thorax with the sides reflexed, the anterior and lateral margins 

 closely punctured, the mesial areolet not quite reaching the anterior 

 margin. Elytra obscure yellow, dusky at the apex ; the first strong 

 costa is joined by its two fine companions scarcely beyond the first 

 quarter of the length of the elytra, the punctures iu the lines are 

 generally square but somewhat unequal. 



Trichalus serraticomis. 



(Plate XYI. fig. lU.) 



Pyrochroa serraticoruis, Fubr., Syst. Ent., p. 203. 



Lycus serraticomis, Fahr.., Mant., i. p. 104; Oliv., Ent., ii. 29, p. 12, 



t. 1. f. 14. 

 Tiichalus serraticomis, Watcrh., Trans. Ent. Soc, 1877, p. 84, pi. ii. 



figs. 109-112. 



" Niger, thorace elytrisque rufescentibus, elytris apice nigris." 



