ART. 9 TWO-WINGED FLIES OF TEIBE MILTOGEAMMINI ALLEN 55 



in form of a trident, pollen not tessellated or changing color when 

 rotated in the light; fu"st segment without apical marginals, second 

 with a strong pak, third with an apical pair and several laterals, 

 which are nearly as strong as the median marginals, not completing 

 an uninterrupted marginal row. Genitalia, in repose, not extruding 

 beyond tip of abdomen; both genital segments black. Wings hyaline; 

 last section of hind cross vein sinuous and strongly oblique to section 

 of fourth vein before the bend, parallel to section beyond the bend; 

 third vein bristly more than half way to small cross vein. Legs 

 black; fore tarsus without conspicuous long bristly hairs on outside; 

 middle tibia with one rather weak bristle on outside beyond middle 

 but lacking a whorl of three at this place; hind tibia on outside with 

 row of about ten unecpial bristles extending from base to apex. 



Female. — Front in one specimen measured 0.34 of head width; 

 frontal vitta at level of lowest orbitals one and one-half times width 

 of parafrontal; third antennal joint four times length of second; 

 buccal width one-ninth eye height. Last three abdominal segments 

 with broadly polished apices, trident-shaped marks indistinct. 

 Hind tibia on outside with seven bristles. Otherwise, except for usual 

 differences of genitalia, like the male. 



Length, 5.0 to 6.0 mm. 



Tyye and allotype.— Cat. No. 28154 U.S.N.M. 



Range. — Utah, Maryland. 



Host relationships. — Unknown. 



Described from the two specimens — the male type from Soldier's 

 Summit, Utah, 7,454 feet, July 6 (J. M. Aldrich) and female allotype 

 from Chesapeake Beach, Maryland, August 19, 1919 (J. M. Aldrich). 

 The female exhibits minor variations from the male, but possibly 

 not more than might be explained by the wide difference in habitat. 

 It is at least much more nearly related to the type of inermis than to 

 any other North i^jnerican species studied. From the closely related 

 campestris, this species may be readily distinguished by the shorter 

 third antennal joint, and by the lack of median marginal bristles on 

 the first abdominal segment, the lack of an encircling whorl of three 

 bristles on the middle tibia and the absence of conspicuous bristly 

 hairs on the outside of the fore tarsus. 



METOPIA TESSELLATA, new species 



Male. — Front 0.34 of head width (measurements of three 0.33, 

 0.34, 0.36); front and face gray pollinose with dark reflections; vitta 

 black or brown, at level of lowest orbital bristles three to five times 

 width of parafrontal; parafrontals sparsely black setulose to below 

 uppermost macrochaetae of parafacial row; antennae black, third 

 joint five to six times length of second; arista thickened on basal 

 third; in profile, bucca wider than parafacials at narrowest, and 



