38 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 60 



small hairy protuberance, a pair of horn-like and a pair of inner 

 narrow lamellae-like appendages, which have a few hairs on their 

 edges. 



All coxae and their hairs and bristles yelloAv. All femora, tibiae, 

 and tarsi yellow. All femora with rather long, delicate, yellow hair 

 on lower posterior edge. Middle tibiae with three, hind ones with 

 several, small, black bristles; the hairs of the legs appear black in 

 certain lights, while in other lights they appear largely yellow. The 

 comparative length of the legs and feet are as follows : Fore femora 

 45, tibiae 60, tarsi as -i-l— 14-8-6-6 ; middle femora 80, tibiae 90, tarsi 

 as 52-28-16-10-8; hind femora 67, tibiae 100, tarsi as 36-29-22-13-8. 

 First and second joints of hind tarsi fringed below with stiff little 

 hairs of nearly equal length. Calypters pale yellow with a brown 

 margin and pale yellow cilia. Halteres dark yellow. 



Wings slightly tinged with brown in front of fourth vein; last 

 section of fourth A'ein a little bent at its middle, parallel with third 

 at tip ; last section of fifth vein twice as long as the crossvein. 



Described from one male (type) taken at Shark River, New Jersey, 

 July 12, 1897,* by C. W. Johnson; two males from Philadelphia and 

 one from Montgomery County, Pennsylvania. Type in the collec- 

 tion of C. W. Johnson. 



Paratypes.— Male, Cat. No. 27051, U.S.N.M. 



This differs from cingulata Loew in the comparative lengths of 

 the tarsal joints, especially those of hind tarsi. The joints of the 

 tarsi of cingulata are as follows: Fore tarsi, 42-15-11-6-6; middle 

 tarsi, 47-20-15-7-7; those of hind tarsi, 26-33-20-12-7. The ap- 

 pendages of the hypopygium also differ somewhat. 



34. ARGYRA (LEUCOSTOLA) INVOLUTA, new species 



Male. — Length, 3.5-4 mm. Face rather wide for a male, silvery 

 white. Palpi yellow with silvery j)ollen and sev^eral hairs and one 

 bristle at tip, which last appears pale against a dark background and 

 is almost as long as the palpus. Front dark green, dulled with 

 white pollen. Antennae black; first joint bare above; third joint 

 about as long as the basal two taken together, subtriangular ; arista 

 nearly apical, as long as the antenna. 



Dorsum of thorax bright green, shining, with a little white pollen 

 in front ; pleurae more blackish. Abdomen shining green with some 

 coppery reflections ; second segment with a large yellow^ spot on each 

 side, these spots only leave a median stripe, widening posteriorly, 

 and a narrow hind margin, which is green. Hypopygium (fig. 31) 

 small, greenish-black; the outer lamellae of nearly equal width 

 throughout and oblique at tip, fringed with pale hairs; there appear 



