THE CANADIAN ENTOMOLOGIST 155 



cressoni has the propodeum coarsely sculptured, while mesillce has 

 it very finely wrinkled. The eighth ventral plates of the males 

 are quite different, and are therefore figured. In cressoni the apical 

 lobes are much shorter than the pedicel attaching them to the 

 plate; in mesillce they are longer than the pedicel. 



Prosopis nelumhonis Robertson 

 Synonym P. fossata Metz. 



The characters which Metz gives as distinguishing this species 

 from all others — namely, the "coarse, dense, pit-like punctures 

 over the entire head and thorax" — are almost the identical words 

 used by Robertson in his original description of the species. The 

 type o( fossata is in the U. S. Nat. Museum, and I have carefully 

 compared it with specimens of nelumhonis from Illinois. 



Prosopis stevensi, new species. 



Male.^Length, about 4.25 mm. Black, face below insertion 

 of antennae old ivory colour, with sparse punctures and silky from 

 minute vertical striatulations, supra-clypeal mark extending up- 

 ward between antennee, truncate at tip; lateral face marks extend- 

 ing above insertion of antenna?, dilated above; slightly extending 

 over antennae and very slightly away from eye margin (fig. 5), 



"^ 



A 



face above insertion of antennae, with rather close and coarse 

 punctures; scape with an ivory stripe in front; flagellum reddish, 

 dusky above; mesonotum with punctures similar to those on vertex, 

 separated from each other by slightly less than a puncture width, 

 surface between punctures lineolate; metanotum rugosopunctate ; 

 propodeum with the area not well defined, very coarsely rugose; 

 laterad of it more finely rugose; propodeum sharply truncate be- 

 hind, truncation surrounded by a salient rim; pronotum wnth two 

 spots, tubercles, tegulae with a spot, fore tibiae with a stripe, mid 



