ZEXILLIA AND ALLIED GENERA SELLERS 21 



sitic on hosts that pass the winter in the pupal stage and emerge the 

 following spring or summer, the flies did not emerge until the fol- 

 lowing spring. 



10. ZENILLIA TUCUMANENSIS, new species 



This species is similar to Zenillia blanda, but the characters given 

 in the key, frontal orbit brassy or golden and fourth segment golden 

 pollinose, will serve to separate it readily. The ratio of the front 

 of the male at the narrowest point in relation to the head width is 

 greater than in blanda (0.21-0.23) or boarmiae (0.20-0.22) ; this is not 

 so noticeable in the females. 



Male (type).— Head with front at narrowest 0.26 head width; 

 frontal row of six bristles, extending from on a level with base of 

 third anteimal segment to two reclinate preverticals ; facial ridge 

 bristly on lowest one-sixth; gena one-seventh eye height; frontal 

 orbit brassy or golden-pollinose ; antenna black, third segment four 

 and one-half times second. Abdomen with fourth segment golden 

 pollinose contrasting with gray of other segments. 



Female (allotype).— Front 0.28 head width; five frontal bristles; 

 third segment of the antenna three and three-fourths times second. 

 Otherwise the description is the same as for the male. 



The paratype material varies as follows from the descriptions 

 above: Female with front 0.28 to 0.30; male and female with five or 

 six frontal bristles; third antennal segment in male four and one- 

 fourth to four and one-half, in female three and one-half to three 

 and three-fourths, times second. 



Type locality. — Tucumail, Argentina. 



Type.— Male, U.S.N.M. No. 54134. 



Host . — Unknown . 



Remarks. — The description is based on an examination of the type, 

 allotype, two male paratypes, and three female paratypes reared from 

 an unknown host, Tucuman, Argentina, Est. Exp. A. C. No. 310 

 (Rust) . The material issued from April 12-30, 1917. 



The bottom spiracular entrances of the stigmal plates of the pu- 

 paria are a little more convoluted than in blanda. 



11. ZENILLIA BOARMIAE (Coquillett), new combination 



ExoriMa boarmiae Coquillett, U. S. Dept. Agr., Div. Ent., Tech. Bull. 7, p. 95, 

 1897.— Chittenden, U. S. Dept. Agr., Div. Ent, Bull. 66, p. 26, 1910.— Sher- 

 man, Journ. Econ. Ent., vol. 13, p. 295, 1920. — Brimley, Ent. News, vol. 33, 

 p. 22, 1922— Greene, Proc. U. S. Nat. Mus., vol. 60, art. 10, p. 16, pi. 6, fig. 25 

 (puparium), 1922.— Leiby, North Carolina Dept. Agr. Bull., Feb. 1925, p. 9.— 

 Sellers, Ann. Ent. Soc. Amer., vol. 23, pp. 569-576, 1930. 



Exorista hypenae Coquillett MS., Howard, U. S. Dept. Agr. Bur. Ent., Bull. 7, 

 n. s., p. 47, 1897.— Hawley, Cornell Univ. Agr. Exp. Stat., Mem. 15, p. 196, 

 1918. 



