1G8 Mr. G. J. Arrow on the 



Dijscinetus dytiscoides, sp. n. (PI. IV. fig. 13.) 



Long3 ovalis, parum convesus, flavus, corpore supra olivaceo-nigro, 

 clypeo prothoracisque lateribus flavis ; capite subtilissime eat 

 parce punctulato, clypeo subquadrato, antice leviter emarginato ; 

 protborace vix fortius punctate, margine antieo vix angulato, 

 postico irnmarginato, lateribus bene marginatis ; scutello im])uuc- 

 tato ; elytris aequaliter baud fortiter punctatis, seriebus quatuor 

 geminatis punctorum, lateribus oninino arcuatis, apieibus sat 

 angustis, paulo setosis ; pygidio baud teeto, rugose punctate, 

 setoso, utrinque impresso ; pedibus gracilibus, flavis : 



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



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



Hah. Colombia, Venezuela. 



This lias a curious resemblance to a Avatcr-beetle of tLe 

 genus Dytiscus in 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 Ugneus, sp. n. 



Castaneus, vertico 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, 

 truncate, margine reflexe, antice subtilissime sinuate, vertice 

 parce punctate ; protborace grosse, baud dense, punctate, lateri- 

 bus rogulariter arcuatis ; scutello punctate ; elytris crebre punc- 

 tatis, seriebus tribus discoidalibus punctorum regulariter gemi- 

 natis ; pygidio grosse punctate ; corpore subtus lievi, mctasterni 

 lateribus paulo punctatis ; maris ct foeminis 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 tibioe are rather less flattened than usual, and the clypeal 

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

 appears to resemble Di/scinctus luridus, Burm., in coloration, 

 but the dcscriiition of the pygidiuai &c. of that species shows 

 that it is iu)t the same. 



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

 received a scries collected at Manaos. 



