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XI. Descriptions of Aculeate Hymenoptera /rom Australia. 

 By Frederick Smith, late Pres. Ent. Soc. 



[Read 4th May, 1868.] 



Of the fifty-five species of Aculeate Hymenoptera de- 

 scribed in this paper, not less than thirty have been re- 

 ceived from Mr. H. Du Boulay, who discovered them at 

 and in the neighbourhood of Champion Bay, in Western 

 Australia. Amongst them, are three species of the genus 

 Crabro, not one I believe having been described previous- 

 ly from that country. Of the rare genus Paragia, four 

 new species are added, and several fine additions are 

 made to the Thynmdce. 



The pi'incipal discoveries o^ Apidce are a fine metallic 

 coloured species of the genus Stenotrihis; one species of 

 LitJiurgus, and six of Megachile. The last-mentioned 

 genus is well represented in i\ustralia, since at least 

 thirty species are known ; in all other countries where 

 these leaf-cutting bees are found, so also is their parasite 

 Coelioxys ; but not a single species of that genus has, to 

 my knowledge, been found in Australia. Probably some 

 other genus of bees is the parasite of Megachile in that 

 country, though I am not acquainted with any parasitic 

 bee at all likely to be so ; if Coelioxys is an Australian 

 insect, it is certainly remarkable that no one should have 

 hitherto captured it. 



The species not indicated as being in the National Col- 

 lection are in my own cabinet. 



Fam. THYNNID.^. 



Gen. Thynnus. 



1. Tlnjnnus ocJiroeephalus . 



Male. Length 11 lines. The head, prothorax, and 

 anterior legs, bright ochraceous, body and legs black. 

 The antennge, tips of the mandibles, and a transverse 

 band on the vertex, enclosing the steramata, black. Thorax 

 punctured, the metathorax and legs with a fine short 

 cinereous pubescence ; the anterior tarsi black ; wings 

 sub-hyaline and ferruginous, their base brown, with the 

 extreme base black, their apical margins with a broad 



TRANS. ENT. SOC. 1868. PART II. (jULY.) 



