ART 18 DIPTEEA OR TWO-WIXGED FLIES ALDRICH 33 



Legs black, claws and pulvilli iong, especially the front ones; 

 front tibi'a with two bristles on outer hind side; middle tibia with 

 one bristle on outer front side near middle; hind tibia on outer 

 hind side subciliate, with one long about middle. 



Wings hyaline, fourth vein w^ith oblique and rounded bend, the 

 distance from its tip to extreme apex of wing barely equal to one- 

 half the hind cross vein. Third vein with two to three hairs at 

 base. 



Female. — Front 0.30 of head width at vertex, wider 'anteriorly 

 (one specimen) ; parafacials slightly wider and third antennal joint 

 narrower (hardly three times the second) ; abdomen with narrower 

 subsilvery bands, the shining black intervening portion wider; 

 genital org'ans retracted, no indications of a piercing organ ; middle 

 tibia with two bristles on outer front side ; hind tibia with irregular 

 bristles on outer hind side, not subciliate. 



Length of male, 8 to 8.5 mm; of female, 9 mm. 



Described from four males and one female. The type male and 

 allotype female Avere collected at Linglestown, Pennsylvania, June 

 15, 1913, and were received from the State Bureau of Plant Industry, 

 Harrisburg, Pennsylvania, through the courtesy of A. B. Champlain. 

 One male was bred " from a I'arge Tipula larva ■' collected by James 

 Fletcher at Chelsea, Quebec (near Ottawa), on May 27, 1906; the 

 puparium was formed on June 3, and the fly emerged on June 27. 

 The puparium will be figured by Charles T. Greene in a later paper. 

 One m'ale was collected by H. C. Fall at Tyngsboro, Massachusetts, 

 on July 26, 1916, and is deposited in the Boston Society of Natural 

 History. The remaining male was collected by E. C. Shannon at 

 Dead Run, Virginia (close to Washington), on June 22, 1913. 



Type^ allotype, and one paratype. — Both sexes. Cat. No. 27100, 

 U.S.N.M. 



Family DEXIIDAE 



Genus DEXIA Meigen 



Bexia Meigex, Systemat. Beschreib.. vol. 5, 1826. p. 33. — Baek, Die Tach- 

 ininen, 1921, p. 160. 



DEXIA VENTRALIS, new species 



Male. — Front O.IS of headwidth (average of three, 0.16, 0.18, and 

 0.19), the middle stripe reddish-brown, the parafrontrals, parafacials. 

 posterior orbits and all below the eye light golden pollinose except a 

 broad brown stripe from the eye downward and forward. Parafa- 

 cials bare. Head from in front obviously higher than wide. Verti- 

 cals small (only one pair), frontals 7 or 8 irregular, beginning below 

 the ocelli and ending at base of antennae; vibrissae above mouth, a 



