376 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



Dinematura braccata Dana, 1852, shown on page 366 of the present paper to be still 



another species of Echlhrogaleus . 

 Dinematura carcharodonti Thomson, 1889, one of the four species to which reference 



is made above, a genuine Dinemahira, but apparently a synonym of D.ferox as 



suggested by Bassett-Smith. 

 Dinemoura coleoptraia Gu^rin, 1837, taken by Steenstrup and Liitken in 1861 as the 



type species of their new genus Echlhrogaleus. 

 Dinemoura elongata Van Beneden, 1857, shown l)y Steenstrup and Liitken to be a 



synonym of D. producta (see also p. 382). 

 Dinemoura fcrox Kroyer, 1838, valid (see p. 377). 

 Dinematura hamiltoni Thomson, 1889, valid (see p. 375). 

 Dinematura gracilis Burmeister, 1833, shown on page 452 of the present paper to be 



probably a young male of Dinematura producta. 

 Dinematura indistincta Kroyer, 1863, probably belongs to the genus Echlhrogaleus, as 



suggested by Bassett-Smith, but only a brief description without figures has ever 



been published. 

 Dinematura lamnse Kroyer, 1863, first described by Johnston in 1835 as Panadarus 



lamnx, but really a synonym for Dinematura producta, as shown by Steenstrup 



and Liitken in 1861. 

 Dinematura Za/i/oKa Steenstrup and Liitken, 1861, valid (see p. 383). 

 Dinemiira musteli-lxvis Hesse, 1880, shown on page 386 of the present paper to l)e 



probably a Demoleus species. 

 Dinematura neozealanica Thomson, 1889, another of the four species to which reference 



is made above, and one which certainly belongs to the genus Echlhrogaleus, as 



suggested by Bassett-Smith. 

 Dinemoura producta Latreille, 1829, the species first described by Miiller as Caligus 



productus in 1785, and taken by Latreille as the type species of his new genus 



Dinemoura (see p. 381). 

 Dinematura scrrata Kroyer, 1863, shown l)y Horst in 1897 to he a new genus and named 



by him Philorthragoriscus (see p. 479). 

 Dinematura sexsetacea Burmeister, 1833, established to include the two species de- 

 scribed by Otto, Caligus heptapus in 1821 and Caligus paradoxus in 1828. But 



the latter was used by Heller as the type of his new genus Demoleus in 1865, and 



hence Burmeister's species becomes a synonym of that genus. 

 Dinematura thynni Kollar, a name given by Kollar on the labels of certain specimens 



in the Vienna Museum. These specimens were made the types of a new genus, 



called Arneiis thynni by Kroyer in 1863. They have since l)een identified with 



Gerstaecker's Elytrophora brachyptera, which was described in 1853. 



We thus see that out of the eighteen species which have been 

 ascribed to this genus only four prove vahd, and they have been 

 included in the key given above. Of the other fourteen, seven belong 

 to the two new genera established by Steenstrup and Liitken and 

 Horst, while the remaining seven are synonyms of other species. 



The confusion in this genus has apparently arisen from a singular 

 inability on the part of the different investigators to appreciate the 

 significance of the structures found just behind the genital segment. 

 It is easy to understand how Miiller, Latreille, and Burmeister failed 

 in this regard; they were pioneers in the work and accomplished 

 wonders in the face of the greatest difficulties. Moreover, we must 

 never forget that they dealt almost wholly with isolated material, 

 and were thus deprived of those suggestions and explanations which 



