PSILOPUS. 2S7 



blackish. Feet yellow, very long and beset with but exceedingly 

 short, for the greatest part minute light-colored hairs. All femora 

 slender ; the foremost ones tapering towards the end, the middle 

 ones from the basis as far as the first third, black ; fore femora 

 upon the first half of the under side with six perpendicular, erect, 

 long, yellow, spine-like bristles ; hind femora upon the first third 

 of the hind side fringed with long, but very delicate whitish hairs. 

 All tibiae very long and slender, fore and middle tibia3 without bris- 

 tles ; the latter, excepting the basis, are rather dark-brown, very 

 elongated, and gradually tapering towards their end. Hind tibiae 

 with rather numerous, very short black bristles upon the under 

 side. Fore tarsi brown, very slender, over once and two-thirds 

 the length of the tibiae ; their first joint is distinctly longer than 

 the tibia ; the following joints are of a decreasing length, and the 

 last one somewhat flattened. Middle tarsi much longer than the 

 fore tarsi, but not quite as long as the middle tibiae, filiform ; the 

 first joint brownish-black, about twice and a half the length of the 

 following taken together, with hairs of such shortness that it ap- 

 pears entirely bare unless very closely examined ; the four follow- 

 ing joints light-brownish, still the extreme tip of the second and 

 of the almost equally long third joints brownish-black ; the two 

 last joints are again of rather equal length, but, taken together, 

 are only about as long as the second joint ; the second and third 

 joints with a distinct black pubescence, the fourth joint with a still 

 longer pubescence ; the small ungues are sharp and the pulvilli 

 very short. Hind tarsi brownish-black with yellowish basis, not 

 quite as long as the tibiae ; their first joint somewhat longer than 

 the four following taken together ; the joints from the second to 

 the fourth of rapidly decreasing length ; the fifth joint about as 

 long as the fourth. Halteres pale-yellowish ; tegulae with whitish 

 cilia. Wings very long and narrow, with brown veins ; the third 

 longitudinal vein is only slightly turned backwards near its end ; 

 the anterior branch has its origin in the middle between the hind 

 transverse vein and the margin ; it diverges from this vein at an 

 obtuse angle and turns in a very flat curve towards the margin, 

 which it reaches somewhat before the extreme apex and not far 

 from the tip of the third longitudinal vein ; the hind transverse 

 vein is unusually distant from the margin, has a rather oblique 

 position and is not distinctly inflected. 



Middle States. (Osten-Sacken.) 



