476 R. OSTEN SACKEN 



relationship to the typical species. I prefer the name dacoides 

 as the description agrees better with my specimen, which is of 

 the same sex with MJ Walker's type. 



Note Oil the genus Achias. Since Fabricius described as Achias 

 oculatus (Syst. Antl. 1805) a single specimen brought by Bosc 

 from Java, no true Achias seems to have reached Europe (at 

 least there is none on record) , until M.'^ "Wallace rediscovered 

 this genus in the Aru Islands and in New Guinea. Macquart 

 gave, it is true, a description of A. oculatus (Hist. Nat. Dipt. 

 II, 260; 1835) « d' après un individu du Cabinet de M.'' Ro- 

 byns à Bruxelles », but in Dipt. Exot. II, 3, 158 (1843) he 

 never mentions this specimen ; on the contrary, he says that 

 the fabrician type is « le seul individu connu ». Upon com- 

 parison it becomes evident that the description in the Hist. Nat. 

 Dipt, is but a paraphrase of the very inexact description in 

 Robineau Desvoidy's Myodaires, p. 433. 



The two species described and figured by M.^ "Westwood 

 (Trans. Ent. Soc. London V, p. 235 , 1850), A. ichneumoneus 

 and A. inaculipennis^ can be referred to Achias in a very wide 

 sense only. 



A. ichneumoneus (East-Indies) does not have the large tegu- 

 lae of a true Achias; its anal cell is slightly drawn out in a 

 point , and not cut off squarely ; its whole habitus is entirely 

 different. It may perhaps be referred to the genus Laglaisia 

 recently estabhshed by M.'" Bigot (Ann. Soc. Ent. Fr. 1880, 

 p. 92), for a species from New Guinea. 



A. maculi'pennis from Java belongs again in an entirely dif- 

 ferent group, as is proved by the absence of the large tegulae, 

 the peculiar venation , and the arrangement of a number of 

 characteristic bristles on the head and the thorax. I look upon 

 it as belonging to the Tnjpetidae , perhaps to Acanthoneura 

 Macq. 



The data, contained in Wiedemann's paper on Achias enable 



