SPECIES THAT HAVE NOT BEEN RECOGNIZED 

 MACROCENTRUS IRIDESCENS French 



Macro<;entrus iridescens Fbe:nch, 6th Ann. Rep. Southern Illinois Normal Univ., 

 p. 42, 1880. 



Type. — Location unknown. 



It has not been possible to identify this species with certainty from 

 the original description; accordingly it has been omitted from the 

 key. However, I have seen two male specimens in the Academy of 

 Natural Sciences of Philadelphia that are labeled " Carbondale, Ills., 

 May 18, 1878, French Coll." and bear the name label Macrocenti^us 

 iridescens French. These are amici^ofloides Viereck, If they are 

 correctly identified as iridescens it will become necessary to suppress 

 amicroploides as a synonym. Since French, in his description, 

 acknowledged his indebtedness to E. T. Cresson for the generic de- 

 termination of the species, and since his type series consisted of 12 

 specimens, it seems rather likely that he sent Cresson specimens for 

 the collection of the Philadelphia Academy, and that the two spec- 

 imens referred to above are actually paratypes. Nevertheless, I hes- 

 itate to synonymize ajnicroploides^ owing to the fact that French 

 described the ovipositor of indescens as " not exserted." 



MACROCENTRUS NIGRIDORSIS Viereck 



Macrocentrus nigridorsis Viereck, Can. Ent., vol. 56, p. 68, 1924. 



Type. — In the Canadian National Collection at Ottawa. 



As already mentioned this species is obviously very similar to, if 

 not identical with, harrisi; there appears to be nothing in the origi- 

 nal description which will separate it from harrisi., and I believe a 

 comparison of the types will make necessary the suppression of the 

 latter name as a synonym. 



MACROCENTRUS PECTORALIS Provancher 



Maorocentrus pectoralis Provancher, Nat. Can., vol. 12, p. 173, 1880. 



Type. — In the Museum of Public Instruction at Quebec, Canada, 

 Since I have not seen the type, and am unable definitely to identify 

 the species from the original description or from notes made by 

 Eohwer, I have omitted pectoralis from the key. It appears, how- 

 ever, to be exceedingly similar to paUisteri and may be found to be 

 identical with that species, in which case paUisteri would fall as a 

 synonym. 

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