Mr. J. Nietner on new Ceylon Coleoptera. 381 



The legs are stout, with the tibiae thickest at the tip ; the third 

 tarsal joint is of the length of the preceding two, the latter are 

 somewhat bilobed and hairy below. The posterior coxse are 

 simple and distant. The mesosternum without a carina. The 

 whole shape of the insect is quadratic rather than otherwise. 



20. Ptenidium macrocephalum, N, 



P. ellipticum, subconvexum, nitidum, sparsim pilosum, supra piceo- 

 seneum, subtus piceum, pedibus oreque testaceis. Long, cor p. ^ lin. 

 Caput maximum. Antennarum clava elongata articulis ellipticis. 

 Thorax subquadratus antice posticeque angustatus, basi punctis 4 

 magnis profunde impressus. Elytra ovata, medimii versus leviter 

 inflata, apice obtuse acuminata, abdomine longiora et ampliora, punc- 

 tulis Uneis dispositis obsoletissime impressa. Alse corpore plus duplo 

 longiores. Tibiae fortiores spiuulosee. Tarsi breviores. Presternum 

 carinatum. 



In prsecedentium societate frequenter lectum. 



This is perhaps the prettiest of the five species of the family 

 just described, and at first sight recognized by the shape of its 

 body and the polished back. The head is very large. The tho- 

 rax is narrowed in front and behind, at the latter place impressed 

 with four deep punctures, which cannot be overlooked. The 

 wing-covers are oval, a little inflated about the middle, rounded 

 at the apex, and longer and wider than the abdomen. The pro- 

 sternum is carinated. 



It affords me much gratification to be enabled to publish re- 

 presentatives of three genera of this highly interesting and pro- 

 bably very extensive and widely distributed family of pigmies, 

 the Asiatic representatives of which have hitherto been entirely 

 unknown. I have no doubt that even this island is the abode 

 of a great many more species. 



21. Stenus barhatus, N. 



S. elongatus, seneo-niger, nitidus, punctatus, sparsim pubescens, 

 pedibus palpisque albidis, ore coxisque testaceis, antennis brun- 

 nescentibus. Long. corp. 2^ lin. 



Caput thorace tertia parte latius, fronte costis 3 abbreviatis, antice 

 albido-pubescens. Antennae art. 3" sequentium 2 fere longitudine, 

 3 ultimis eloiTTiatis, ellipticis. Palpi max. elongati apice densius 

 pubescentes. Thorax cylindricus medio leviter incrassatus, basi sub- 

 quadratus. Elytra thorace paulo longiora, sed fere duplo latiora, 

 couvexa, ovata. Abdomen immarginatum. Pedes elongati tenues, 

 tibiis apice tarsisque fortiter setosis, his art. 4° profunde bilobato. 



In lacus Colomb. ripis specimina nonnulla legi. 



This, as well as the following species, belongs to Erichson's 



