PSEN. 263 



Four species only are known from India : nothing is known 

 about their habits. The European species, however, are said to 

 uest in bramble-stems and in the tubes of straw in thatched 

 houses, and to store their nests with Aphides. 



Key to the Species. 



a. Head and thorax black, variegated with 



yellow P. ptilchcrrimus, p. 263. 



h. Head and thorax entirely black. 



a'. Abdomen black P. orientalis, p. 203. 



V , Abdomen more or less red. 



d^. Base of median segment depressed, 



with a furrow to the apex P. rvjiventris, p. 264. 



6^. Base of median segment not depressed, 

 with one medial and two short lateral 

 carinas P. clavatus, p. 264. 



485. Psen pulcherrimus, Bi72gh. Jour. Linn. Soe. 1896, p. 443. 



2 . Head above, thorax, and abdomen smooth and shining ; 

 clypeus small, convex, densely pilose, the front between the eyes 

 broad, the flagellum of the antennae setaceous, ocelli sunk, well 

 separated from each other ; the apex of the mesonotum and the 

 sides and apex of the postscutellum with coarse, outwardly oblique 

 striae ; median segment long, rounded posteriorly, with a \^ ell- 

 marked medial longitudinal furrow ; legs stout, posterior tibiae 

 minutely spinose ; the apices of abdominal segments 2-4 slightly 

 constricted. Head and thorax black ; abdomen ferruginous 

 red ; the scape and basal five joints of the flagellum of the 

 antennae beneath, a line on the pronotum, a spot in front of the 

 tegula?, the tegulae, a large square spot at the apex of the meso- 

 notum, the scutellum and postscutellum, two large oblong spots 

 at the apex of the median segment, the apex of the coxae, the 

 trochanters, femora, tibiae and tarsi of the legs, and the petiole of 

 the abdomen yellow ; the posterior femora, tibiae, and tarsi with a 

 fuscous stain, the apex of the petiole below black ; wings hyaline 

 and beautifully iridescent, nervures testaceous. 



Hab. Tenasserim. 5 • Length 7 ; exj). 12 mm. S unknown. 

 Type in coil. British Museum. 



486. Psen orientalis, Cam. Mem. Manch. L. Ph. Soc. (4) iii. 1890, 



p. 269, $ . 



5 . Closely resembling P. riijiveiitris. 

 Cam., in form, but the clypeus is 

 larger and more convex ; the enclosed 

 subtriangular space at base of the 

 median segment is smaller, not de- 

 pressed, finely not coarsely longi- 

 ^ tudinally striate, and with a shining 

 ■^ '^' !^' r, , broad medial furrow, wliiL-h is con- 



Psenor<eniaUs,2. r- ^jj^^^.j beyond the upex of the 



enclosed space as a fine carina to the apex of the segment ; the 



