PSEN PALLIPES. 181 



base a small enclosed space which is longitudinally grooved; 

 from hence to the apex runs a deep central channel ; the legs 

 pubescent, the tarsi rufo-piceous, the posterior tibiae spinose, 

 and the anterior tarsi ciliated exteriorly ; the calcaria pale tes- 

 taceous. Abdomen highly polished, and covered more or less 

 with a fine silky white pile ; the petiole smooth, shining, and 

 slightly curved; the apical segment punctured, and margined 

 at the sides towards its apex. 



Male. Length 4^ lines. Differs in having the antennae fulvous, 

 more or less obscure above ; the scape very large, the eighth, 

 ninth and tenth segments concave beneath and serrated ; the 

 mandibles and palpi pale rufo-testaceous ; the anterior and 

 intermediate legs of a reddish yellow, the anterior tarsi yel- 

 lowish ; the intermediate tarsi ferruginous, the basal joint pro- 

 duced exteriorly, and with two short acute spines at the apex, 

 the following joints slightly produced ; the anterior and inter- 

 mediate femora black beneath ; the posterior tarsi rufo-piceous, 

 the calcaria pale testaceous. 



Var. Those parts which are described as reddish yellow, bright 

 yellow. 



This insect has hitherto been exceedingly rare. -Some years 

 ago I captured a pair near Hawley, Hants ; and during the last 

 season I saw one on a flower near Lowestoft, Suffolk ; there 

 are several in the collection of Mr. Kirby in the Entomological 

 Society's Museum, probably taken in Suffolk. 



2. Psen pallipes. 



P. ater ; clypeo argenteo, facie carinata ; tibiis anticis subtus 

 tarsisque omnibus ferrugineis aut piceis. 



Sphex pallipes, Panz. Faun. Germ. 52. 22 $ . 

 Trypoxylon atratum, Panz. Faun. Germ. 98. 15. 

 Psen atra, Panz. Krit. Revis. ii. 109. 

 Psen atratus, Van d. Lind. Obs. ii. 103. 2. 



Shuck. Foss. Hym. 227. 2. 



Dahlb. Hym. Europ. i. 5. 6. 



St. Farg. Hym. iii. 40. 1. 



Wesm. Hym. Foss. Bely. 116. 1. 



Female. Length 3 lines. Shining black ; the head delicately 

 punctured, the face covered with silvery pubescence ; the fla- 

 gellum fulvous beneath ; a carina runs between the antennae, 

 passing upwards and uniting with a transverse one. Thorax 

 sparingly and delicately punctured on the disk, with two or 

 three slight scratches at the base of the mesothorax ; the meta- 

 thorax with a triangular depression at its base, in front longi- 



