psilopus. 27 7 



a narrow black border and yellowish-white cilia. Wings rather 

 large, of an elliptical outline, tinged with brownish-gray ; the third 

 longitudinal vein is but little curved backwards at the end; the 

 anterior branch of the fourth longitudinal vein, the origin of which 

 lies nearer to the posterior transverse vein than to the margin of 

 the wing, leaves this vein at an obtuse angle, and turns in a flat 

 curve towards the margin, which it reaches a little before the apex 

 and not far from the tip of the third longitudinal vein ; the poste- 

 rior transverse vein lies proportionally far away from the margin, 

 is but moderately oblique and not inflected. 



Female. It resembles the g very much, but shows the follow- 

 ing differences : The color of the dust upon front, thorax, seutel- 

 lum and abdomen is more yellow-grayish. The blackish, triangu- 

 lar dorsal spots of the abdomen are indistinct. The fore coxes 

 have, besides the yellowish-white pubescence, on the inner and 

 outer margin, as also at the tip, numerous yellow bristles. Feet 

 shorter and of stouter structure than in the J\ Upon the first 

 half of the under side of the fore femora there are five diverging 

 stout thorn-like bristles of yellow color. All the tibiae are sparely 

 beset with single black bristles of medium length. Tarsi dis- 

 tinctly shorter than in the g , from the third joint infuscated, 

 the last joint dark brown, the second to fourth joints of the fore 

 tarsi decreasing in length more rapidly than in the J* . Wings 

 somewhat smaller and less obtuse than those of the g ; tie neura- 

 tion does not show any perceptible difference. 



Hah. New York. (Osten-Sacken, w r ho found it frequently in 

 June and July in the buildings near the Bowling Green and the 

 Battery, on w r alls and windows in the rooms.) 



Observation 1. — The present species is not only an entirely 

 European form, but also without the least doubt perfectly identi- 

 cal with P. albonotatus, which I have discovered at Rhodus and 

 described in " Neite Beitr. V." The comparison of two g of the 

 latter with several g of P. pattens shows, that there is no per- 

 ceptible difference between them. 



Observation 2. — At the Imperial Museum in Vienna there are 

 two specimens of P. pallens marked "New Holland." The 

 simultaneous* existence of the species in North America and 

 Europe might lead to believe in the possibility of its also occur- 

 ring in New Holland. However, my reasons for doubting this at 

 present are as follows : the pins bearing these specimens are easily 



