226 Memoirs of the Indiau Museum. [Vol. Ill, 



Ophrygonius birmanicus, n. sp. 

 Text-fig. 3A. 



Described from a single specimen from the Ruby Mines District of Burma, 

 preserved in the British Museum collection. 



Description. —Length 35 mm. Differs from 0. caniori in the following characters 

 onh'. Lamellae of antennie somewhat longer (but the first two not as long as the 

 last four). Anterior lower tooth of both mandibles rather small but very sharply 

 pointed. Left outer tubercle of head very slender, almost parallel-sided, sunply trun- 

 cate distally, directed very distinctly inwards. Scars and lateral angles of meso- 

 sternum matt. Posterior intermediate and lateral, areas of metasternum less distinct 

 from one another behind, the puncturing of the latter extending a little distance 

 over on to the surface of the former; posterior parts of hind coxae, and scars of 

 abdominal sterna, scarcely as smooth. 



Text-i-igure 3. 



A. Ophrvgoniiis birmanicus , head x 4. 



B. Ol>hrygonms singapv.rae, head x 4. 



Ophrygonius singapurae, u. sp. 

 Text-fig. 3B. 



Described from a single specimen from Singapore in the collection of the 

 Konigliches Zoologisches Museum in Berlin. 



Description. —Length 31 mm. This interesting species is closely allied to the 

 preceding, with whose characters it combines some of those of Ophrygonius inacqua- 

 lis on the one hand, and of Aceraius wallacei on the other. The lamellae of the 

 antennae are all very long and slender as in A . wxllacei. The lowest terminal tooth 

 of the m.indibles is probably well-developed on both sides in fresh specimens, as is 

 usual in this genus ; but that of the right side is very obtuse ( probably through 

 friction) in the specimen before me ; the anterior lower tooth of both mandibles is 

 very broad , and flattened dorso-ventrally, resembling that of the left mandible of 

 most species of Aceraius, though the horizonal margin is scarcely grooved. The 

 mentum resembles that of Ophrygonius inaequalis. The head bears distinct, finely 

 keeled, frontal ridges (not grooves) as in 0. inaequalis; the left outer tubercle 

 is intermediate in form between that of 0. cantori and 0. birmanicus ; the parietal 

 ridges are somewhat short ; the supra-occipital ridge is united to the supraorbital 



