HYMENOPTERA. 



429 



4. Pemphredon lugens. 



Pemphredon lugens, Dahlb. Disp"! Meth. Spec. Hym. 12. 76 ? <? • 

 Zett. Ins. Lapp. 444. 1. 



Hab. Sweden; Lapland; Gothland. 



5 Pemphredon annulatus. 



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



Hab. N. America (Indiana). 



6. Pemphredon concolor. 



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

 pend, p. 72. 1. 



Hab. Pennsylvania. 



7. Pemphredon marginatus. 



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. hind, Obs. ii. 105. 3. 

 Mimesa unicolor, Shuck. Foss. Hym. 231. 3c??. 



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



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

 Mimesa boreahs, 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 svilcata." 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 

 Wesmael's opinion in regarding the M. borealis as synonymous 

 with M. bicolor. 



