34 PROCEEDINGS OP THE NATIONAL MUSEUM vol.74 



5. Third joint of fore tarsi large at base, suddenly narrowed on apical half 



(fig. 45) abmpta Van Duzee. 



Third joint of fore tarsi much enlarged below to apical end (fig. 46). 



varipes, new species. 



6. Antennae yellow ; dorsum of thorax opaque with silvery white pollen when 



viewed from in front (fore tarsi, fig. 47) pollinosa Van Duzee. 



Antennae black 7. 



7. Upper edge of first joint of fore tarsi and whole of second joint black, second 



joint with a projection above at tip (fig. 49) flavipes Van Duzee. 



First three joints of fore tarsi yellow, second joint without a projection 

 (fig. 50) scaura, new species. 



Of these eight species three were described by me in the Proceed- 

 ings of the California Academy of Sciences (vol. 9, 1919), planipes 

 and favipes, on page 269, and abruptus on page 270. 



J. M. Aldrich took two males of planipes May 25, 1926, at Tamau, 

 Alta Vera Paz, Guatemala. The other five species are described 

 below. 



MEDETERA BELLA, new species 



Ferrmle. — Length, 2.2 mm. Face, front, and anterior half of thorax 

 are of a beautiful blue color, posterior half of thorax and scutellum 

 green; antennae black, third joint small, rounded; arista brown, 

 slender ; hairs of the thorax and some of the smaller bristles yellow ; 

 large bristles and those above fore coxae black; scutellum yellow 

 below, with two pairs of bristles; abdomen green with black hair; 

 ovipositor j^ellow. 



Coxae, femora, tibiae and tarsi black; knees slightly yellowish; 

 fore coxae with black hair and bristles; joints of posterior tarsi as 

 14r-25-l 5-7-7. Calypters, their cilia and the halteres pale yellow. 



Wings grayish, veins brown; last section of fifth vein 19, cross 

 vein sixteen-fiftieths of a millimeter long; venation normal. 



Described from one female taken by Nathan Banks June 23, 1924, 

 at Barro Colorado Island, Panama Canal Zone. 



Type. — In the Museum of Comparative Zoology. 



This species can be easily recognized by the bright shining blue 

 and green thorax, black legs and feet, black antennae, yellow hair 

 on the thorax, and black hair on the abdomen. 



MEDETERA POLLINOSA, new species 



Male. — Length, 2.5 mm. Face and front black with violet reflec- 

 tions; antennae yellow, third joint short, rounded; arista yelloAvish; 

 orbital cilia wholly black. 



Thorax bright but dark green; when viewed from in front the 

 ground color is nearly concealed by silvery white pollen ; hairs and 

 bristles of the thorax, including those above the fore coxae, black; 

 scutellum with two pairs of bristles. Abdomen nearly black with 



