ALDRKJH AND DARLINGTON. 83 



Seventeen females and four males. Aldrich: Brookings, South 

 Dakota, June 11th; Moscow, Idaho. Melander : Austin, Texas, 

 November 16-19th. U. S. N. M.: Mesilla Park, New Mexico, 

 February 18th. C. F. Baker: Pine Lake, California. 



The species was originally described from Texas; it has been 

 reported from " upper burrows of desert rodents" in Arizona. Pro- 

 fessor Melander informs me that he collected it at Austin, Texas, in 

 a novel manner : he buried wide mouthed bottles up to the neck in 

 ant hills, left them over night, and on approaching next morning 

 slipped a cork in before the flies had time to be disturbed. 



Lieria helvola Loew. 



Scoliocentra helvola Loew, Centuries, ii, 80. 



Mule. — Yellow, the largest of the family, with large yellow wings. 



Head yellow, the lower half deeper yellow, sharply limited above; face 

 receding, oral margin not very distinct, one strong vibrissa; cheeks one-third 

 the height of the eye; antenna short, yellow, with long, thin arista. 



Thorax yellow, bristles fairly well developed, dorsum with rather dense black 

 hair; pleurae bare except the sternopleura, which is covered with fine, black 

 hair and has one bristle; scutelliim bare, lighter yellow than the rest of the 

 dorsum, with the usual bristles; halteres yellow. 



Abdomen yellow, with dense black hair, hind margins of the segments nar- 

 rowly blackish (less distinct than in the female) ; hypopygium small and 

 inflected; halteies yellow. 



Legs yellow, including all the tarsi; preapical bristles slender on front and 

 hind tibiae; middle tibiae with stouter ones, and a cluster of several apical ones, 

 the larger ones distinctly curved ; front tibiae with a row of bristles above and 

 one below; hind tibiae with a short row above near the apex: pulvilli rather 

 large, whitish. 



Wings large, yellow, the posterior cross-vein and the tips of the three veins 

 in the apex margined with brown; a distinctly yellower tinge accompanies all 

 the veins, last section of fifth vein only one-third as long as the posterior cross- 

 vein ; costal setae strong. 



Length 8.5 mm.; of wing 9.5 mm. 



Female. — Paler yellow, less hairy, bristles larger, distinct narrow black holders 

 behind on the second, third, fourth and fifth abdominal segments. 



One male, five females. Aldrich: a pair from Ithaca, New York, 

 June 5 and July 6, 1897, which were originally in the collection of 

 Cornell University. Daecke : Orange Mountains., New Jersey, 

 August, a female collected by Weidt. U. S. N. M.: White Mount- 

 ains, New Hampshire. Johnson : North Mountain., Pennsylvania, 

 August 28, 1897, and Elkhard, Indiana. 



Originally described from Illinois, but the distribution is rather 

 eastern. 



TRANS. AM. ENT. SOC. XXXIV. MARCH. 1908. 



