THE CANADIAN ENTOMOLOGIST 227 



THE ANTHOMYIID GENUS PHYLLOGASTER (DIPTERA). 



BY J. R. MALLOCH, URBAN A, ILL. 



In the collection of the Illinois State Laboratory of Natural 

 History I find two species of the genus Phyllogaster, one being the 

 genotype and the other an undescribed species. 



Nothing is known of the immature stages of the genus. The 

 specimens before me were taken on or near the seashore or the 

 banks of rivers. The genotype was described from specimens 

 from Florida and Massachusetts. 



The females of this genus may be separated from those of any 

 other in Coenosiinse except Tetramerinx by the presence of four 

 strong, clawlike thorns at apex of last abdominal segment. The 

 former has but 3 pairs of post-sutural, dorso-central bristles while 

 the latter has 4. Both sexes of Phyllogaster have the frons pro- 

 truded beyond the anterior margin of eyes, the antennae much 

 elongated, and the arista bare and much swollen on the basal 

 third. 



Diagnosis of Species. 



Abdomen with an interrupted longitudinal median brown 

 stripe and a pair of faint spots of same colour on segments 

 3 and 4; hind femora with 1 or 2 strong and several weak 

 bristles on apical half of antero-ventral surface; hind 

 tibiae with 1 antero-ventral bristle; third vein of ywing 

 bare proximad of the inner cross- vein cordyluroides. 



Abdomen usually with the central stripe faintly visible, the 

 spots indistinguishable; hind femora with from 3 to 5 

 strong bristles on apical half of antero-ventral surface; 

 hind tibiae with 2 antero-ventral bristles; third vein 

 usually with a few weak bristles proximad of the inner 

 cross- vein littoralis. 



Phyllogaster cordyluroides Stein. 

 Berl. Ent. Zeitschr., 1897, p. 256. 



I have before me two males which I consider belong to Stein's 

 species. One specimen, from Florida, is very pale in colour, being 



July. 1917 



