AMERICAN DIPTKRA. 283 



Tegnlse and their cilia black. 

 Lciigtl) 6 mm. 



One male, Chapada, Brazil (Dr. Williston). 



PNilopodinus criiiitiis sp. nov. 



Male. — Dee]) green or blue species, very bright, the bristles of head, thorax, ab- 

 domen, and fore tibiae greatly elongated, many of them wavy tovrard the tips; 

 antennae black, the arista over tvFo-thirds the length of the entire body, whitish 

 at tip; appendages of hypopygium small, blackish; all coxse, trochanters and 

 femora black, tibiae, except the extreme ti)) of hind ones, yellow ; hind tarsi 

 wholly, the others but very slightly, infuscated ; fore and middle tarsi slender, 

 elongated, the fore metatarsus with long cilia above, otherwise the tarsi are of 

 plain structure. Wings hyaline, a faint iufuscation on the anterior apical part; 

 posterior crossvein very oblique. 



Fe.male.— Arista slender, about half the length of the body; bristles of poste- 

 rior part of the thorax and scutellum of noticeable length, and those of front and 

 middle tibiae quite strikingly elongated ; fore metatarsus with distinct small bris- 

 tles above ; crossvein less oblique ; otherwise as in male. 



Length 4-4.5 mm. 



Three males, six females, Florida (Lake Worth and Biscayne 

 Bay), Mrs. Slosson ; Fla. and Lawrence, Ivans., from the Univ. of 

 Kaus. 



This species has a most remarkable resemblance to comatus, under 

 which name I reported it to Mrs. Slosson, but differs in having 

 small, dark (instead of large, pale yellow) appendages to the hypo- 

 pygium, and in the absence of cilia the entire length of the middle 

 tarsus. 



The females of the two species are readily distinguished from all 

 others at present known by the distinct row of hairs or small bris- 

 tles on the upper side of the fore metatarsus ; I have been unable to 

 find any distinct character to separate them from each other. 



I'silopodiiiiis imperator sp. nov. 



J/rt/e.— Face bright metallic, overlaid with silver pollen ; antennaj small, 

 brownish black, almost destitute of bristles; front violet, thinly poUinose in a 

 certain light, with pale hairs on the sides. Thorax green, the scutellum and part 

 before it of a beautiful rosaceous, running into purple; pleurae with pure white 

 pollen ; halteres moderately infuscated ; cilia of tegulae pale on the lower half, 

 blackish above. Abdomen slender, with rather long bristles; the basal three 

 joints conspicuously marked with a non-metallic brown color, the incisures of 

 the following part with moderate black bauds; hypopygium small, rounded, 

 brownish black, with two slender, acuminate, brown organs projecting forward ; 

 venter brownish. Middle and hind coxae brown ; fore cosai and all trochanters, 

 femora and tibii» yellow; hind knees slightly infuscated ; fore tibia with only 

 one or two minute bristles, fore metatarsus much longer than the tibia, with a 

 few minute hairs below ; middle tarsus once and a half as long as the tibia, infus- 

 cated from the middle of the first joint; hind tibia moderately hairy on the inner 

 side, on the outer with two small bristles; hind tarsi infuscated from the base. 



TRANS. AM. ENT. 80C. XXX. OCTOBEK. 1904. 



