HYMEXOPTERA. 429 



4. PEMPHREDOX LUGENS. 



Pemphredon lugens, Dahlb. Disp. Meth. Spec. Hym. 12. 76 $ J . 

 Zett. Ins. Lapp. 444. 1. 



Hab. Sweden; Lapland; Gothland. 



5 PEMPHREDON AXNULATUS. 



Pemphredon? annulatus, Say, Bost. Journ. i. 379. 2. 



Hab. N. America (Indiana). 



6. PEMPHREDON COXCOLOR. 



Pemphredon? concolor, Say, Narr. Exped. St. Peter's River, Ap- 

 pend, p. 72. 1. 



Hab. Pennsylvania. 



7- PEMPHREDON MARGIXATUS. 



Pemphredon? marginatus, Say, Bost. Journ. i. 379. 1. 



Hab. N. America; Pennsylvania. 



Genus 9. MIMESA. 



Trypoxylon, pt., Fabr. Syst. Piez. 182. 6 (1804). 

 Psen, Latr. Nouv. Diet. 2nd ed. 28 (1816). 

 Mimesa, Shuck. Foss. Hym. 228 (1837). 



1. MIMESA UNICOLOR. B.M. 



Psen unicolor, Van d. Lind, Obs. ii. 105. 3. 

 Mimesa unicolor, Shuck. Foss. Hym. 231. 3 <J ? . 



Wesm. Hym. Foss. Belg. 108. 1. 



Smith, Cat. Brit. Hym. 41. 3. 

 Mimesa borealis, Dahlb. Hym. Europ. i. 2.2$ ? . 



Hab. Britain; Germany; Belgium; Sweden. 



Dahlbom, in the diagnosis of this species, says that the petiole 

 is carinated above, the carina being "non sulcata." The examina- 

 tion of a large number of examples shows this to be a variable 

 character : in some specimens of males the channel is scarcely 

 perceptible ; and there can be little doubt of the correctness of 

 WesmaePs opinion in regarding the M. borealis as synonymous 

 with 31. bicolor. 



