180 PSEN ATER. 



Genus 11. PSEN. 



Psen, Latr. Precis (1796). 

 Sphex, pt., Fabr.Ent. Syst. Suppl 243 (1798). 

 Pelopceus, pt., Fabr. Syst. Piez. 202 (1804). 

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

 Mimesa, pt., Dahlb. Hym. Europ. i. 2 (1843). 

 Mesopora, Wesm. Hym. Foss. Belg. 116 (1852). 



Head transverse, as wide as the thorax ; eyes ovate and late- 

 ral ; the stemmata in a triangle on the vertex ; the antennae in- 

 serted in the middle of the face ; the flagellum subclavate ; the 

 clypeus transverse, rounded in front ; labrurn concealed ; the 

 mandibles bidentate. Thorax short and ovate; the collar trans- 

 verse ; the anterior wings with one elongate marginal cell, which 

 is acute at its apex, and three submarginal ones ; the first oblong, 

 the second much smaller and narrowed towards the marginal cell, 

 the third larger than the second, oblique, and somewhat narrowed 

 towards the marginal ; the second submarginal receiving the first 

 recurrent nervure a little before the middle, the third submarginal 

 receiving the second recurrent nervure near its base; the legs 

 simple. Abdomen oblong-ovate, with an elongate petiole at its 

 base ; the apex terminating in an upcurved spine in the males. 



1. Psen ater. 

 P. ater ; clypeo argenteo villoso ; metathorace rugoso ; petiolo 



elongate, lasvissimo, polito. Foam. 

 P. antennis ferrugineis, compressis, subserratis. Mas. 



Sphex atra, Fabr. Ent. Syst. Supp. 244. 18, 19. 



Panz. Faun. Germ. 72. 7. 

 Pelopceus unicolor, Fabr. Syst. Piez. 204. 11. 

 Trypoxylon atratum,/^r. Syst. Piez. 182.5. 

 Psen atra, Panz. Krit. Revis. ii. 108. 

 Psen pallipes, Spin. Ins. Lig. i. 94. 2. 

 Psen serraticornis, Jurine, Hym. tab. 8. gen. 6 $ . 

 Psen ater, Van d. Lind. Obs. ii. 102. 1. 



Latr. Hist. Nat. Ins. xiii. 300 ? 



Shuck. Foss. Hym. 225. 1. 



St. Farg. Hym.\\\ 40. 1. 

 Mimesa atra, Dahlb. Hym. Europ. i. 2, 3. 

 Mesopora atra, Wesm. Hym. Foss. Belg. 116. 6. 



Female. Length 5 lines. Shining black ; the face densely 

 covered with silvery pubescence ; the mandibles obscurely fer- 

 ruginous in the middle : the palpi pale rufo-testaceous ; the an- 

 tennae rufo-piceous beneath. Tl.e mesothorax finely punctured ; 

 the metathorax obtusely rounded and coarsely rugose, at its 



