280 S. W. WILLISTON, M. D. 



67. Eristalis precipuus n. sp. 



'^ . — Length 12 — 13 mm. Allied to E. scutellaris aud conicus, but easily distin- 

 guished by the red legs. Face thickly covered with white pile and pollen, leav- 

 ing a shining median stripe and the cheeks narrowly shining black. Antennae 

 reddish brown, the basal joints and the arista more reddish. Frontal triangle 

 shining black, with black pile. Eyes briefly pilose above. Mesouotura, in front, 

 ochraceous gray, separated by a crescentic opaque black band from the presutural 

 opaque gray band ; behind the suture an opaque black band, in front of a 

 broader, shining steel-blue band. Pleurae largely silvery gray pollinosc; 

 some yellowish pile in front of the root of the wings. Scutellum oi)aque light 

 yellow, with the base narrowly opaque black. Abdomen opaque black, second 

 segment with two large quadrate yellow spots, leaving a rather broad median stripe 

 and a posterior band; third segment with a large yellow spot on each side, nar- 

 rowly connected on the front margin ; fourth segment with an entire steel-blue 

 .shining cross-band; hypopyginm shining steel-blue; second, third and fourth 

 segments each with a narrow posterior yellow margin. Legs yellowish, some- 

 times brownish, red, the tarsi brown ; hind femora considerably thickened. 

 Wings grayish hyaline, often lightly tinged with brownish exteriorly. 



9 . — Front shining black, at the vertex steel-blue, with lilack pile : an opaque 

 band below the ocelli and the orbits below narrowly whitish pollinose. Spots of 

 the second abdominal segment sometimes largely shining blue; third and fourth 

 segments shining metallic blue with a posterior opaque band. 



Fourteen specimens, Chapada. The antennse are sometiiues red- 

 dish or blackish, but never light colored. 



68. Eristalis viiietorum Fabr. 



Five specimens, Rio de Janeiro and Corumbii. 



69. Eriiiitalis iiigripes Wied. 



Six specimens, Rio de Janeiro, Corumba and Uarcarizal. Is 

 easily recognizable from Wiedemann's description. 



70. Eristalis agrorum Wied. 



Fifteen specimens (Chapada), as large and more elongate than 

 vinetorum, I cannot identify with certainty. The antennse are not 

 " ocherbraunlichschwarz," but red, or brownish red. The fourth 

 and fifth abdominal segments have no yellow spots whatever. Wiede- 

 mann's description, moreover, applies to the male only, though both 

 sexes are given in his diagnosis. In the male, the spots of the second 

 and third segments are very large, quadrate, with a very slender 

 posterior brownish band on the second segment, and a narrow one 

 on the third. Otherwise the description applies pretty well to our 

 specimens. 



71. Eristalis Tolaticus n. sp. 



'^ . — Length 10—11 mm. Face densely, nearly white pollinose ; median stripe 

 and cheeks shining black. Antennte brownish yellow, the first two joints black- 



