BY T. 11. JOHNSTON AND L. HAIIRISON, 325 



Neumann has already replaced Nitzschia Denny, 1842 (nee 

 V. Baer, 1827) by Demi t/uf,. a,nd Piagetia Picaglia, \^'6b,(nec 

 Ritsenia, 1874) by Piagetiella. Picaglia's paper is not availaVjle 

 to us, and his genus has not been taken into account by Kellogg, 

 beyond the mere mention of it in his bibliography(1896, p. 36). 

 The species are listed under Menopon in the latter 's list (Kellogg, 

 1908). We are, therefore, not able to give any opinion as to the 

 value of the genus. A subdivision of the unwieldy Menopon is, 

 however, desirable. Etireum N., is included by Neumann in his 

 list of genera, though Kellogg(1899, p. 133) has shown it to be 

 based on immature forms of a Menopon. The latter author has 

 studied E. niaUeui> N.,( = i)/. mfilleus), which, being the better 

 known of Nitzsch's two species, may be taken as the type. 



In a later publication, Neumann (1909, p.9, footnote) has 

 changed Ornithobius Denny, to Ornithonomus, as he considers the 

 former name to be preoccupied by Ornithobia Meigen, 1832, in 

 Diptera. In the recommendations under ^Vrt.36 of the Inter- 

 national Code, as given by Stiles(1905, p. 47), and by Blanchard 

 (1906, p. 32), this is not allowed to be sufficient grounds for the 

 rejection of a name. We have accordingly placed Ornithonomus 

 Neum., as a synonym of Oi-nithobius Denny, in the list of genera 

 appended. Piageti 1880, p.378) has already shown that Meta- 

 peuron Rudow, (type M. punctntum Rud., = 0. cygni L.) is a 

 synonym of this genus. 



The following genera, pi-oposed prior to Neumann's papei', have 

 been omitted bv him, viz., Nesiotinus Kellogg, 1903; Philoceanus 

 Kell., 1903; (9?'mcAo^aa; Carriker, 1903; A'e//of/f/ia Carriker, 1903; 

 Heterodoxus Le Souef A: Bullen, 1 902; LaturticephaluDi Le JSouef, 

 1902. 



In conclusion, we append a list of the twenty-eight genera at 

 present existing, indicating the types where our available litei-- 

 ature has permitted. Such of these types as are marked with an 

 asterisk(*), liave been designated as such by ourselves, and, for 

 the most part, have been selected fi-oin the available species on 

 account of their occurrence on common domestic animals, or on 

 other hosts which are fairly readily obtainable. 



