1G8 Mr. G. J. Arrow on the 



Di/scinetus dytiscoides, sp. n. (PL IV. fig. 13.) 



Longa ovalis, parum convexus, flavus, corpore supra olivaceo-nigro, 

 clypeo prothoracisque lateribus flavis ; capite subtilissime sat 

 parce punctulato, clypeo Bubquadrato, antice leviter emarginato ; 

 prothorace vix fortius punctato, margine antico vix angulato, 

 postico immarginato, lateribus bene marginatis ; scutello impunc- 

 tato ; elytris sequaliter baud fortiter punctatis, seriebus quatuor 

 geminatis punctorum, lateribus omnino arcuatis, apicibus sat 

 augustis, paulo setosis ; pygidio baud tecto, rugose punctato, 

 setoso, utrinque impresso ; pedibus gracilibus, flavis : 



(S , tarsis anticis paulo incrassatis, ungue majore profunda fisso. 



Long. 19-22 mm. ; lat. max. 10-12 mm. 



Hab. Colombia, Venezuela. 



This has a curious resemblance to a water-beetle of the 

 genus Dyliscus iu its outline and coloration^ as well as in the 

 texture of the surface. Its very elongate oval shape, the 

 pale lower surface, legs, and sides of the prothorax produce 

 an appearance which immediately distinguish it from every 

 other known species of Dyscinetus. 



Stenocrates ligneus, sp. n. 



Castaneus, vertice utrinque prothoracisque maculis duabus magnis 

 discoidalibus fuscis, elytrorum disco plerumque vage obscuriore, 

 corpore subtus pedibusque flavo-castaneis ; ovalis, parum con- 

 vexus, fere nudus, pedibus brevissimis, clypeo rugoso, brevi, 

 truncato, margine reflexo, antice subtilissime siuuato, vertice 

 parce punctato ; prothorace grosse, baud dense, punctato, lateri- 

 bus regulariter arcuatis ; scutello punctato ; elytris crebre punc- 

 tatis, seriebus tribus discoidalibus punctorum regulariter gemi- 

 natis ; pygidio grosse punctato ; corpore subtus laevi, metasterni 

 lateribus paulo punctatis ; maris et fceminis fere similibus. 



Long. 12-15 mm. ; lat. max. 6-8 mm. 



Hah. Brazil : Manaos, Ega. 



This is an isolated species both in form and colour. It is 

 the only not-black species known to me, and its closely 

 punctured elytra give it an unusually dull appearance. Its 

 short depressed form and very short legs in both sexes seem 

 to indicate habits different from those of its congeners. The 

 hind tibiffi are rather less flattened than usual, and the elypeal 

 suture,, though well marked, is not carinate. The insect 

 appears to resemble Dyscinetus lurldus, Burm., in coloration, 

 but the description of the pygidium &c. of that species shows 

 that it is not the same. 



A specimen was taken at Ega by H. W. Bates, and I have 

 received a series collected at Manaos. 



