ART. 9 AMERICAN XYLOTINE SYRPHID-FLIES SHANNON 47 



third, and fourth tergites; abdominal venter shining black with 

 yellow pile ; wings brownish. Length, 14 mm. ; wing, 11 mm. 



S. coerulea differs in being entirely shining very dark blue, the 

 mesonotum rather sparsely brownish poUinose; the legs entirely 

 black; the abdomen mostly black pilose, pale pilose on anterior 

 corners of tergites and on the venter; wings dark infuscated an- 

 teriorly, subhyaline behind. 



Type locality. — Chile (J. Fernz). 



Type male. — In British Museum. 



Genus PHILIPPIMYIA, new genus 



Entirely shining, dark blue with purplish reflections ; head broadly 

 elliptical, evenly rounded; antennae moderate; face narrow, the 

 moderate length of the arista much longer than facial Avidth; face 

 protruding in profile, moderately concave; metasternum bare; hind 

 trochanters simple; hind femur slender; claws small and entirely 

 black : third vein curved downward ; first posterior cell closed nearly 

 at wing margin ; alar lobe narrow. 



Genotype. — f Sterphus cyanocephala Philippi. 



PHILIPPIMYIA CYANOCEPHALA (Philippi) 



? Sterphus cya>iocephaJa Philippi, Verb. Zool.-bot. Ges. Wien, vol. 15, 1865, p. 

 738. 



One male, Chile (E. C. Reed) ; one female, Santiago, Chile (A. 

 Faz). Determined by J. M. Aldrich. 

 Type. — Santiago, Chile ( ? ) . 



Genus CREPIDOMYIA, new genus 



Of rather large and linear form and dark color. Face with three 

 ridges, a longitudinal one and a lateral pair which extend obliquely 

 from the oral margin to the e3''es; metasternum bare, hind trochanter 

 spurred in both sexes; petiole beyond first posterior cell one-half as 

 long as discal crossvein. 



Genotype. — Crepidomyia tricrepis, new species. 



CREPIDOMYIA TRICREPIS, new species 



Male. — Frontal triangle large, flat, and densely covered with pale 

 yellow pollen; antennae black, moderate, third joint about one and 

 one-half times as long as broad; arista a little longer than width of 

 face across middle, yellowish basally, becoming whitish outwardly; 

 face black with rather broad stripes of pollen within the lateral 

 ridges; lower face more than twice as broad as third antennal joint; 

 mesonotum black, a pollinose spot mesad of humerus and the trans- 



