542 Mr. R. E. Turner on Fof-sorial flymenoptera. 



Hab. Brisbane {H. Hacker) ; September. 



Very near ivaterhousn, Turn., from which it differs in the 

 shape of the head in the female and in the shape and colour 

 of the anterior margin of the clypeus in the male. 



Lestricothynnus opiimus, Sm. 



Thynnus optimus, Sm. Cat. Ilyni. B.M. vii. p. 29 (1859). J . 

 Thynnus sulcatus, Sm. Cat. Hym. B.M. vii. p. 42 (1859). $ . 



Hab. Dorre Island, W. Australia {Grant Watson). ^ 9 

 in cop. 



I had previously suggested that these were sexes of one 

 species, and a considerable series of both sexes, many taken 

 in copula, in Grant Watson's collection confirms my con- 

 jecture. Several of these pairs are now in the National 

 Collection. 



Leptothynnus (^) peltasles, sp. n. 



"J . Niger, albido-pilosus ; alls subhyalinis, venis nigris ; segmento 

 ventrali sexto utrinque spina acuta arraato ; segmento dorsali 

 septimo lamella plana baud instructo ; hypopygio linguiforme, 

 apice spina acuta armato, spinis basalibus nullis. 



$ . Nigra, nitida, sparse punctata ; segmento dorsali primo trans- 

 versa rugoso, apice late sulcato ; segmento dorsali secundo 

 transverse quinquecarinato ; epipygio triangulari, obliquo, basi 

 angusto ; hypopygio apice late rotundato, epipygio multo longiore ; 

 segmento ventrali quiuto rugoso. 



Long., d 17, 5 14 mm. 



$ . Clypeus moderately convex, closely punctured, broadly 

 truncate at the apex, the labrura slightly exposed and 

 broadly rounded at the apex. Head closely and finely punc- 

 tured, the iuterantennal carina almost transverse ; antennae 

 longer than the thorax and median segment combined, 

 distinctly slenderer at the apex, the apical joints very feebly 

 arcuate beneath. Anterior margin of the pronotum dis- 

 tinctly raised, the angles not prominent. Thorax closely 

 punctured ; median segment much more finely punctured, 

 rounded ; scutellum fiattened ; anterior coxse flattened. 

 Abdomen rather slender, fusiform, shallovvly and rather 

 sparsely punctured, the segments scarcely constricted at the 

 base ; sixth ventral segment with a spine on each side at the 

 apical angles ; seventh dorsal segment not produced into a 

 flattened plate ; hypopygium linguiform, with an acute 

 apical spine. Second abscissa of the racfius as long as the 

 third ; second recurrent nervure received just beyond one- 

 third from the base of the third cubital cell. 



