MIMESA BICOLOR. 183 



Psen equestris, Van d. Lind. Obs. iL 107. 4. 



Curtis, Brit. Ent. i. t. 25 $ . 

 Mimesa equestris, Shuck. Foss. Hym. 229. 1. 



Dahlb. Hym. Europ. i. 4, 5. 



Wesm. Hym. Fess. Belg. 109. 3 ? 

 Mimesa Shuckardi, Wesm. Hym. Foss. Belg. 115. 5 $ ? 



Female. Length 4-4 lines. Black ; the head and thorax 

 slightly shining and punctured ; the flagellum fulvous beneath, 

 the apical joint usually entirely so; the tips of the mandibles 

 ferruginous. The mesothorax with an impressed line on each 

 side in front, extending to the apex; the metathorax rugose, 

 with a triangular enclosed space at its base, which is coarsely 

 striated longitudinally ; the wings hyaline and iridescent, the 

 nervures black, the tegulae testaceous ; the apical joints of the 

 tarsi ferruginous ; the anterior tarsi ciliated outside, the inter- 

 mediate and posterior tibiae spinose. Abdomen : the first and 

 second segments ferruginous, the following, as well as the pe- 

 tiole, shining black ; the petiole flat above, more or less rugose ; 

 the sides of the petiole bordered by elevated longitudinal carinae, 

 and having also a central carina, beneath flat, and slightly 

 hollowed out at its extremity ; the petiole wider at its apex 

 than at its base. 



Male. Very like the female ; but differs in having the silvery 

 pubescence on the face denser ; the antennae longer ; the tarsi 

 usually more ferruginous, the sides only of the first segment 

 red, sometimes with a black spot above ; the apex of the ab- 

 domen furnished with an upcurved spine. 



Yar. The basal half of the third segment of the abdomen red. 



Usually a scarce species, although widely distributed ; it has 

 occurred in Yorkshire, Isle of Wight, on Hampstead Heath, and 

 also at Sandhurst, Berks. At Lowestoft, Suifolk, it is the com- 

 mon species, where I found it in great numbers. 



2. Mimesa bicolor. 



M. atra; abdominis segmentis tribus anticis rufis ; petiolo 

 lineari. 



Psen bicolor, Jurine, Hym. 1. 13 $ . 

 Mimesa bicolor, Shuck. Foss. Hym. 230. 2. 



Wesm. Hym. Foss. Belg. 113. 4. 

 Mimesa lutaria, Dahlb. Hym. Europ. i. 4. 4. 

 Psen equestris, St. Farg. Hym. iii. 43. 3. 



Female. Length 3-4 J lines. Head and thorax as in the pre- 

 ceding species ; the tarsi usually more ferruginous, and the tips 



