428 



Mr. G. J. Arrow on the 



brightly coloured scales, forming a wider sutural stripe and 

 a second one much abbreviated at each end. The third is 

 almost or entirely lost. 



Ancistrosoma tobagoensis, sp. n, (Figs. 2, 2 a.) 



Nigrum, elytris pedibusque flavidis, setis minutis flavis fere ubiqne 

 tectum, capitis, pronoti scutellique setis rufescentioribus, pronoto 

 utrinque late denudato, areis denudatis setis sparsutis antice 

 divisis, scutelli setis longioribus et erectis ; utrisque elytris tri- 

 costatis, costis angustis, antice denudatis; pygidio linea angusta 

 median a denudata notato : 



6* , clypeo reflexo margine antico fere recto, pygidio convexo, 

 infiexo ; segmento ventrali primo processu recto valde obliquo 

 armato ; pedum 4 posticorum unguibus fissis : 



$ , clypeo lato, laevissime bilobato ; pygidio brevi, planato ; ungui- 

 bus omnibus fissis. 



Long. 18-20 mm. ; lat. max. 8-9 mm. 



Hub. Tobago. 



This is very easily recognizable by the deep yellow 

 (orange-yellow in the anterior part) colour of the seta? with 

 which almost the whole surface is covered, except the large, 

 smooth, lateral patches of the pronotum. The setre are 



Fig. 2. 



Fiir. 2 a. 



smaller and less elongate than in A. trinitatis. The head, 

 scutellum, elytra, and lower surface are closely clothed with 

 them, the three costse of each elytra forming denuded lines, 

 which are so narrow as to be quite inconspicuous to the 

 naked eye except at the anterior end. The humeral and 



