212 REVISION OF THE THYNNID.E OF AUSTRALIA, I., 



Subfamily DIAMMIN^. 



Males. — First and second recurrent nervures received by the 

 second cubital cell almost together; the division of the first cubital 

 cell unmarked. 



Mandibles tridentate, maxillary palpi six-jointed, labial four- 

 jointed. Labrum transverse, very short. Hypopygium unarmed, 

 claspers short and small. 



Females. — Much larger than the male, the mouth-parts fully 

 developed and larger than in the male, mandibles stout, quadri- 

 dentate; palpi as in the male, but larger. Second abdominal 

 segment smooth, without carin?e; pygidium simple 



Genus D I A M m a. 



Diamma Westw., Proc. Zool. Soc. Loudon, iii. p. 53, 1835(9). 



TachijpterusGuei:, Voy. Coq. Zool. ii. 2, p.213,(1830)l839((J). 



Psaminatha ^huckard, Trans. Ent. Soc. London, ii.l, p. 68, 1837((^). 



Trachypterus D. Torre, Cat. Hyni. viii. 119, 1897 (nee. Guer., 

 Voy. Coq ii. 2). 



Diamma Ashm., Canad. Ent. xxxv., 1903. 



Ash mead points out that Guerin's paper in the Voyage de la 

 Coquille was not i)ublished until 1839, though the date on the 

 title page is 1830. Westwood's name therefore has priority. 

 Characters as in the subfamily. The antennaj of the male are 

 stout and rather short. The ocelli are present in the female. 



D. iiicOLOR Westw. 



Diamma bicolor West., Proc.Zool.Soc.London,iii.p.53, 1835(9). 



Psammatha chalybea Shuckard, Trans. Ent. Soc. London, ii. 1, 

 p.69, 1837((J). ' 



Tachypterus fasciaius Guer., Vo3^ Coq. ii. 2, p. 2 17 (1830) 1839 

 (^); Guer., Mag. de Zool. xii. 1842((J). 



Tachypterus ay stralis ^auss. , Keisr d.Nov. Zool.ii. 1, Hym.p.l09 

 n.l,T.2,f.27, 1867((J). 



Tachy Icterus albojnctus Sm., Trans. Ent. Soc. London, 1868, 

 p.237((J). 



