1893.] NATURAL SCIENCES OF PHILADELPHIA. 485 



One species, formerly referred to Larra and two new species occur 

 in this country. They may be tabulated as follows: 



FEMALES. 



Wings sub-hyaline; apical margin fuscous argentata. 



Wings dark fuliginous. 



First joint of flagellum distinctly shorter than the second .... 

 nigripennis. 



First joint of flagellum about equal to the second ... acqiiaiia. 



MALES. 



Wings subhy aline; apical margin fuscous argentata. 



Wings dark fuliginous aequalis. 



Notogonia argentata Bve. 



Larra argentata Bve., Ins. Afr. et Amer. p. 119. taf, III, f. 9, 1.805. 

 Lyrops argentata Say, Journ. Nat. Hist. I, p. 370, 1S36. 

 Larrada argentata Sni., 1. c. p. 292. 



9 . — Clypeus rounded anteriorly, exceedingly finely and closely 

 punctured, except on anterior portion where the punctures are larger 

 and sparse; first, second and third joints of the flagellum about equal 

 in length ; space between the eyes at the top is about equal to the 

 length of the first joint of the fiagellum; dorsulum not strongly de- 

 pressed anteriorly in the middle and is indistinctly punctured ; scu- 

 tellum sub-convex, not impressed : metanotum evidently very finely 

 granulated, and with a medial, raised line extending from base to 

 apex, the posterior face, especially laterally, with strong, transverse 

 wrinkles; sculpture of metapleurre like the dorsulum; legs stout, the 

 tibise and tarsi strongly spinose; comb on fore tarsi not well devel- 

 oped, composed of stout, widely separated spines; sculpture of abdo- 

 men indistinct, the last ventral segment with rather strong punctures; 

 black, the tegulae testaceous behind; head, thorax and legs when 

 held in certain lights clothed with silvery pile, which is densest on 

 clypeus and cheeks, the apical margin of dorsal segments 1-3 also 

 with silvery pile ; wings subhyaline, iridescent, apical margins fus- 

 cous. Length 10-14 mm. 



$ . — Closely resembles the 9; antenna? shorter and stouter, the 

 joints more compact, first joint of fiagellum shorter than the second; 

 space between the eyes at the top equal to about the length of the 

 first and one-third of the second joint of the flagellum; anterior 

 margin of the clypeus a little produced medially; hind femora with 

 a swelling at the base beneath, the middle femora beneath near 

 the base strongly incurved as are likewise the fore femora ; this sex 



