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PLATE CCCCXL, 



SIREX BIMACULATUS, 



BIMACULATED SAW-FLY. 

 HYMENOPTEBA, 



GENERJC CHARACTER. 

 Mouth with a thick, horny, truncated, rtiort, denticulated man- 

 dible: feelers four, the pofterior part longer and thicker upwards: 

 antennas filiform, of more than twenty-four equal articulations : fting 

 exferted, ferrated, and ftiff : abdomen feffile, terminating in a point : 

 wings lanceolate and incumbent, the lower ones fhorter. 



SPECIFIC CHARACTER. 



SjKJEX BIMACULATUS. Abdomen yellow : a black fpot on the firil 

 and three pofterior rings : thorax fubfufcous, with 

 two black fpots. 



This is a curious fpecies, and differs apparently from any of the Si- 

 rex genus at prefent defcribed. The head and thorax is fufcous, the 

 latter marked in the middle with two blackifh oblong fpots. The 

 body is orange with black fpots, and the legs orange having the pofterior 

 pair marked at the lower end of each principal joint with black. The 

 legs are compreffed. Wings reddilh-brown. The figure in the plate 

 ij of the natural fize. 



PLATE 



