14 Journal New York Entomological Society. [Voi. iv. 



9. Nysson compactus Cress. 



Nysson compactus Cresson, Tr. Am. Ent. Soc. IX, p. 278, 9 $ . 

 Washington State. 



10. Nysson tristis Cress. 



Nysson tristis Cresson, Tr. Am. Ent. Soc. IX, p. 281, $ . 

 Washington State. 



11. Nysson lateralis, Pack. 



Nysson lata ale Packard, Proc. Ent. Soc. Phila. VI, p. 440, $ . 

 Nysson lateralis Patton, Can. Ent. XI, p. 213, f . 



Canada (Provancher) ; Maine, New Hampshire, Virginia, Illinois 

 (Patton). 



12. Nysson subtilis, sp. nov. 



$. — Cheeks margined posteriorly beneatli, coarsely punctured; front closely 

 punctured, appearing strongly granular, feebly ridged above antennae; between 

 ocelli flat, not tuberculate ; clypeus strongly punctured, transversely depressed before 

 apical margin, the latter subtruncate ; antennae stout, scape shining, strongly punc- 

 ured, flagellum opake, the last joint curved, nearly as long as the three preceding 

 united, obliquely truncate at tip, preceding joint slightly produced beneath at apex; 

 dorsulum with strong, tolerably well sejiarated, punctures; scutellum rugose, no 

 margined laterally ; mesopleurse strongly rugosopunctate ; middle-segment with the 

 spines sharp, slenderer than in lateralis, enclosure longitudinally and somewhat ir- 

 regularly ridged; hind tibiae not spinose ; wings subhyaline, iiervures dark, petiole of 

 second submarginal cell a little shorter than the height of cell, submedian cell of pos- 

 terior wings terminating a little beyond the origin of the cubital vein ; punctures of 

 abdomen subtile, much feebler than in lateralis, stronger on first segment, 

 second ventral strongly convex, particularly toward the base, but not truncate anter- 

 iorly, last dorsal bidentate as in the allied species. Black, the tubercles, and a trans- 

 verse spot at each side of the first three dorsal segments, yellow ; tarsi and anterior 

 tibise in front, testaceous ; clypeus and anterior orbits with silvery pubescence. Length 

 6^ mm. 



Algonquin, Illinois (Nason). Easily distinguished by the entirely 

 black front and subtile punctuation of the abdomen. 



13. Nysson rusticus Cress. 



Nysson rusticus Cresson, Tr. Am. Ent. Soc. IX, p. 283, $ 9 . 



Washington; Moscow, Idaho (Aldrich); Colorado. 



14. Nysson nigripes Frov. 



Aysson nigripes Provancher, Add. Hym. Quebec, p. 269, $ . 

 Hull, Canada CProvancher). Unknown to me. Placed near ri/s- 

 ticus provisionally, as it may belong elsewhere. 



