88 PROCEEDINGS OF THE NATIONAL MUSEUM vol.93 



Webber, Allen, and Baker. One male collected at Potlatch, Idaho, 

 July 27, 1927 (Aldrich), may possibly be distinct from this species. 

 This male has all pollen tinged with gold, the abdomen excepted, the 

 body hairs of thorax and abdomen much longer, and the frons not 

 much deeper golden than the type and other specimens. 



11. APLOMYA CAESAR (Aldrich), new combination 



TSxorista nigripalpis Townsend (nee Macquart, 1840), Psyche, vol. 7, p. 330, 

 1896.— Coquiixett, U. S. Dept. Agr., Div. Ent, Tech. Bull. 7, p. 03, 1897.— 

 Tothiix, Can. Ent., vol. 45, p. 71, 1913 ; Ottawa Nat., vol. 28, p. 114, 1914.— 

 Gibson, Ann. Rep. Ontario Ent. Soc, 1918, p. 117.— Greene, Proc. U. S. Nat. 

 Mus., vol. 60, art. 10, p. 11, fig. 83 (puparium), 1922.— Httbeb and Neis- 

 WANDEE, Journ. Econ. Ent., vol 17, p. 127, 1924. 



Exorista cacsar Aldrich, Can. Ent., vol. 48, p. 20, 1916. — Caesar, Ann. Rep. 

 Ontario Ent. Soc. 1916, p. 173. — Spencer and Crawford, Ontario Dept. Agr. 

 Bull. 295, p. 7, 1923. 



Zenillia caesar (Aldrich) Aldrich and Webber, Proc. U. S. Nat. Mus., vol. 63, 

 art. 17, pp. 28-29, 1924.— Johnson. List of New England Diptera, p. 196, 

 1925; Biological survey of Mount Desert, The insect fauna, pt. 1, p. 201, 

 1927— EssiG, Insects of Western North America, p. 581, 1026— West. 

 Cornell Univ. !Agr. Exp. Stat. Mem. 101, p. 814, 1928. 



This species has been considered to be synonymous with Aplomya 

 mitis Meigen, an introduced parasite of the European corn borer. 

 This is another example of the resemblance of species between the 

 Nearctic and Palearctic realms. The characters used to separate 

 these two species are more or less relative in value, but, if carefully 

 used, they will be found to be satisfactory. 



Frontal row of eight to ten bristles in male and six to eight in 

 female, extending from on a level with base of third antennal seg- 

 ment to one reclinate prevertical; facial ridge bristly on lowest one- 

 fourth in male, lowest one-sixth in female ; gena one-sixth eye height ; 

 antenna black ; palpus black. 



Thorax black, thinly gray-pollinose in male, more noticeably pol- 

 linose in female, with a bluish tinge; marked with five mesonotal 

 vittae, the three median vittae very prominent before the suture and 

 abbreviated behind; disk of scutellum covered with erect hairs, usual 

 pair of discal scutellars lacking; hind tibia not ciliate; wing grayish 

 hyaline, third vein with two bristles at base; squamae white. 



Abdomen black, gray-pollinose (more noticeably so in female) 

 with a bluish tinge; second to fourth segments pollinose on basal 

 two-thirds, varying from thinly gray pollinose to a heavier silver- 

 gray pollinose laterally and basally; first segment, posterior one- 

 third of segments two to four, and dorsal vitta shining black; ab- 

 dominal hairs suberect in male, depressed in female; first and second 

 segments with a pair and third with a row of marginal marochaetae; 

 fourth segment rather irregularly tipped with marginal and sub- 



