Manchester Memoirs, Vol. xlii. (1898), No. 1. 45 



long silvery hair. Thorax opaque, alutaceous, thickly 

 covered with longish white hair, longest and thickest on 

 the scutellum and median segment. Apex of the median 

 segment with with an oblique slope ; the basal half in the 

 centre with a wide, moderately deep furrow, from which 

 run some curved, oblique keels ; the base of the slope 

 coarsely punctured ; the rest with strong, transverse, dis- 

 tinctly separated striations. Pleurae and sternum with 

 small, shallow, distinctly separated punctures ; the sternum 

 depressed in the centre, down which runs a straight, stout 

 keel. Coxae, trochanters and femora covered somewhat 

 thickly with longish white hair ; the tibiae and tarsi pru- 

 inose. Wings fusco-hyaline ; the extreme apex smoky ; 

 the second cubital cellule triangular ; in length scarcely 

 half the length of the pedicle ; the first recurrent nervure 

 received shortly, but distinctly, in front of the cubital ; the 

 second interstitial ; the second transverse cubital nervure 

 near the top, and both branches at the bottom are bul- 

 lated. Abdomen opaque, the segments at the apices 

 banded with silvery pubescence ; the basal two ventral 

 segments sparsely covered with white hair ; the apical 

 more thickly with longer fuscous hair ; the base of the 

 second segment is smooth, raised, and, in the middle, pro- 

 jects into a somewhat triangular area. 



P. morosus Sm., is a smaller species than this, has 

 the head, thorax and abdomen more shining, and much 

 less pilose ; the furrows on the median segment shorter 

 and shallower ; its head is more developed behind ; the 

 abdomen deeply excavated in the middle at the base ; the 

 depression on the mesopleurae wider and deeper ; the 

 pedicle of the second cubital cellule hardly longer than 

 the appendicular cellule ; the second transverse cubital 

 nervure is more rounded and curved at the bottom ; the 

 second cubital cellule at the top is hardly so long as the 

 second at the bottom, while in P. morosus it is longer ; 



