J. R. MALLOCH 279 



Phaonia laticornis new species 



Male and female.- — Black, distinctly shining, with moderatelj' dense gray 

 pruinescence. Head entirely black, orbits, parafacials, and cheeks with 

 whitish pruinescence. Thorax with four black vittae. Abdomen with a 

 series of poorly defined dorsocentral spots and lateral checkerings black. 

 I^egs testaceous yellow, tarsi black, femora darker than tibiae, at least the 

 fore pair and sometimes all pairs infuscated. ^Vings clear. Calyptrae 

 yellowish white. Halteres 3-ellow. 



Male.^ — Ej'es almost bare; narrowest part of frons about one-fifth of the 

 head-width; orbits narrow, each with about seven long bristles, the upper one 

 opposite anterior ocellus, and in addition to the bristles numerous setulose 

 hairs; third antennal segment about three times as long as broad, extending 

 almost to mouth-margin; arista with its longest hairs about twice as long as 

 its basal diameter; parafacial over half as wide at base of antennae as width 

 of third antennal segment, becoming almost Unear below; cheek nearly as 

 high as width of third antennal segment. Thorax with the presutural acro- 

 stichal hairs long but not setulose; prealar long; postsutural dorsocentrals 

 three; hypopleura bare. Abdomen ovate, basal sternite bare, fifth cleft. 

 Fore tibia with two posterior bristles; hind femur with some erect hairs at 

 base ventrally and two preapical anteroventral bristles; hind tibia with two 

 anterodorsal and two anteroventral bristles. 



Length, 6.5 to 7.5 mm. 



(S. A. Shaw), [Illinois State Natural History Survey]. Allotype, 

 female, Cedar Lake, Illinois, August 6, 1906, (C. A. Hart)- 

 Paratypes, females, Oconto, Wisconsin, August 1, 1920, (T. H- 

 Prison); Dummerston, Vermont, July 14, 1908, (C. W. Johnson); 

 ^'irginia, no other data. [U. S. N. M.]. 



Phaonia atlanis new species 



Alale. — Black, subopaque, densely gray i)ruinescent. Orbits, parafacials, 

 and cheeks white pruinescent; basal two antennal segments brownish yellow, 

 third black; palpi fuscous. Thorax with four fuscous vittae on anterior half, 

 the median pair most distinct. Abdomen with a dorsocentral fuscous vitta 

 which is more or less triangularly dilated on each segment. Legs yellow, all 

 femora more or less infuscated, the fore f)air most distinctly so, tarsi fuscous; 

 Wings clear, cross-veins narrowly but distinctly infuscated. Calyptrae 

 whitish. Halteres yellow. 



Eyes almost bare, separated at narrowest jiart of frons bj' a distance about 

 twice as great as width of third antennal segment; orbits with bristles almost 

 to level of anterior ocellus; interfrontalia distinct on its entire length, at its 

 narrowest part wider than one orbit at that part; parafacial not as wide as 

 third antennal segment; cheek higher than width of third antennal segments; 

 longest hairs on arista longer than width of third antennal segment. Thorax 

 with two or three series of fine hairs between the presutural parts of the 



TKAXS. AM. EXT. SOC, XLVIII. 



