J. R. MALLOCH 273 



genitalia of female without the pair of long apically rounded 

 processes so noticeable in Phaonia (figs. 1 and 2). Hind tibia 

 without bristles on the postero-dorsal surface. 

 Genotype, Spilogaster fulvus Bigot. 



Xenaricia fulva Bif^(jt 



1885. Spilognskr fulvus Bigot, Ann. Soc. Ent. France, (6), iv, 289. 



Two males and two females with data as follows: Redwood 

 Canon, Marin County, California, May 17, 1908. 



BUCEPHALOMYIA son ii. 



This genus is erected for the reception of one species, which 

 was originally described as Tetramerinx femorata by the present 

 writer. From that genus it may be separated by the lack of 

 thorns at the apex of the abdomen in the female, the distinctly 

 convergent third and fourth veins in both sexes, the third also 

 having several bristles at base both above and below. 



I have not seen the male of Tetramerinx unica Stein, the geno- 

 type, but the female possesses characters that undoubtcMlly place 

 it in the Phaoniinae and not in Coenosiinae. 



Bucephalomyia femorata Malloch 



191.3. Tetramerinx femorata ]\Ialloch, Proc. U. S. Nat. Mus., xiv, ()03. 



The female of this species has previously been unknown. It 

 differs from the male in having no comb of short stiff bristles at 

 1)ase of ventral surface of hind femoi-a. 



Neither sex has any bristles on the ventral prothoracic plate 

 between the foie coxae, a character that separates the genus from 

 that section of Limnophora which has the third and fourth veins 

 convergent apically and the former with bristles at hase. 



Localit}': Alamogordo, New Mexico, one male, ^lay 3; one 

 female. May o; one male, May 6, 1902. 



TETRAMERINX Horg 



This genus is represented in this collection by one species. I 

 have only females of the genotype before me, but the specimen in 

 this collection is undoubtedly different from these ami is without 

 (piestion congeneric with them. 



Generic cliaracters. — Frons slightly over one-third the head- 

 width, anterior orl)it:d bristle slightly below base of antennae, the 



TRANS. .\M. 1:NT. soc, XLIV. 



