LucanoidColeoptcra. 83 



tudine, aplcibus curvatis, acutis, intus irregulariter den- 

 ticulatis, basi emarginatis ; capite subquadrato, fronte 

 antice depressa, emarginata, lateribus fortiter et grosse 

 punctatis, angulis ante oculos obtusis, pone oculos leviter 

 inflatis; clypeo parvo^ binodoso; tliorace transverse, an- 

 gulis posticis obliquisj margine antico fulvo-ciliato ; ely- 

 tris crebre punctatis, ad suturatn sublfevibus; scutello 

 triangular!, sparsim punctulato; pedibus rufo-piceis, 

 tibiis extus inermibus, intus ciliatis, tarsis subtus fulvo- 

 hirtis. 



Long. Corp. lin. 10; mandib. lin. 2\. 



Hah. — Malacca. Mus. Parry et Mniszech. 



This new species is closely allied to P. cilipes, Thom- 

 son, from Assam ; but is at once distinguished by the 

 structure of its mandibles, the smooth lateral margins of 

 its prothorax, its unarmed tibiee, and the normal length 

 of its tarsi; whereas, in P. cilipes, the mandibles are 

 provided internally, at their base, with a large bifid tooth 

 (whereof no trace exists in P. mysticus), the lateral 

 margins of the prothorax are strongly crenulate, the four 

 posterior tibiae are armed with a single spine, and the 

 tarsi attain extraordinary proportions, being about one- 

 third longer than their respective tibias. 



Prosopocoilus Archeri. 



Aulacostethus Archeri, C. Waterh. Tr. Ent. Soc. 1869, 

 p. 14, pi. iii. fig. 1. 



I am somewhat perplexed in locating the insect for 

 which Mr. C. Waterhouse has proposed a new genus, 

 and of which the characters given are as follows : — 



" 1st. The form of the mentum varying from all other 

 species belonging to the Lucanidce. 



" 2ndly. The eyes being entirely divided by a 

 canthus. 



" 3rdly. The presternum being narrow and longitu- 

 dinally canaliculate. 



" 4thly. The four posterior tibiae being most conspi- 

 cuously enlarged at their extreme apex, with the tarsi 

 remarkably short. ^' 



The author's first idea of referring this insect to the 

 Cladognathidce appears to me to be correct, exhibiting as 



