NOTES ON ACULEATE HYMEXOPTERA. 99 



Trypoxylon aurifrons, Shuck. This species proves to be 

 a Brazilian insect, Mr. H. W. Bates has taken several speci- 

 mens at Santarem. 



Mimesa Dahlbomi, Wesm. This species has not hitherto 

 been recorded as a British insect ; it closely resembles the M. 

 unicolor of Vanderlinden, but it is at once distinguished by 

 the form of the apical segment of the abdomen, which, above, 

 forms an elongated triangle margined at the sides, very 

 smooth and shining, and with a few scattered punctures ; 

 in M. unicolor it is cylindric, and not margined at the sides. 

 I discovered a specimen amongst the series of 31. unicolor in 

 the Stephensian Collection ; I have little doubt it will be 

 found in plenty, if the black species of the Crabronidce are 

 diligently collected. 



Nomada borealis. I described this species in the Zoolo- 

 gist under the name Nomada inquilina, not being aware that 

 it had been previously named by Zetterstedt; the description 

 of that author is very decisive as to the identity of our spe- 

 cies, but all doubts have been removed by Dr. Nylander's 

 sending me specimens of the Lapland insect. In the London 

 district the species appears to be rare ; eight or ten years 

 ago I took half a dozen at Hampstead, and one or two of 

 what I had little doubt was the male ; since that time I lost 

 sight of it until the present season, when I captured a single 

 specimen. In the north it proves to be abundant; Mr. Bold 

 and also Mr. Wailes, of Newcastle, have this year taken it 

 in plenty. 



Bombus lapidarius. There are few species of our humble- 

 bees so abundant as this insect, it is plentiful in all parts of 

 the kingdom ; at Southend it abounds. During the twenty 

 years that I have collected the Bombi and investigated 

 their habits, I have not met with more than twenty couples 

 in coitu, and I never observed this in B. lapidarius until 

 the present season, when I obtained a pair at Deal ; the 



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