12 PROCEEDIISrGS OF THE NATIONAL MUSEUM vol. 70 



from oral margin; thorax black, with black erect hairs; fore and 

 mid legs brownish; mid femora rather long pilose; hind legs black, 

 the second and third joints yellowish, the femur and tibia clothed 

 with black, shaggy hair ; abdomen spatulate, black ; first tergite with 

 long black hairs; second tergite bluish aeneous, an opaque black 

 band beyond middle; third and fourth tergites with aeneous cross- 

 bands on fore and hind margins; distal section of apical cross vein 

 longer than posterior cross vein; alula unusually large; bases of 

 wings infuscated; squamae dark with dark cilia; length 9 mm.; 

 wing 7 mm. 



Type locality. — Ivon, Beni, Bolivia (February, 1922, W. M. Mann, 

 Mulford Biological Expedition). 



Type.— Cat. No. 28759, U.S.N.M. 



Subfamily Chilosinae 



ALIPUMILIO, new genus 



Genotype. — Alipumilio feinoratus^ new species. 



A verj^ unusual type of Syrphidae allied to Psilota and the 

 Chrysogasterini. Disproportionately short and thick in appearance, 

 body entirely black and finely punctated, clothed everywhere with 

 microscopic pile except on parts of abdomen. Head large, subcircular 

 in outline (frontal aspect) ; eyes very densel}'^ and very short pilose, 

 and very large, their hind margins forming the hind margins of 

 the head, the occipital region being crowded out except for a small 

 portion at vertex; front very long and narrow, widening down- 

 ward, finely punctate; ocelli placed very close to hind occipital 

 margin; antennae fairly large, placed below middle of head; face 

 narrow, slightly converging downward, deeply and evenly con- 

 caved between antennae and oral margin; head set solidly against 

 the thorax; the humeral callus flattened into a single plane which 

 is frontal and is hidden by the head; no pile perceptible on the 

 callus; prosternum more than twice as broad as long; anterior 

 thoracic spiracle on cephalic aspect of thorax; mesonotum much 

 broader than long; scutellum broad, hind margin flattened into a 

 thin edge; hind femur very large, spinose beneath, spurious vein 

 absent ; apical cross vein with angle placed at middle, upper portion 

 directed somewhat basad; plumula well developed. (Figs. 1, 2, 

 and 3.) 



ALIPUMILIO FEMORATUS, new species 



Female. — Antenna brownish; third joint nearly twice as long as 

 broad, in width two-thirds as wide as the front at vertex ; lower part 

 of face bluish; anterior oral margin light yellow; legs black, tips 

 of tibiae and tarsi reddish yellow ; tarsi unusually short and rather 

 thick; hind tibia arcuate; abdomen with bright yellow tomentum 



