SNOW: DESCRIPTIONS OF NORTH AMERICAN TRYPETID^. 165 



space between second and third bands reaches the fourth vein, while 

 in pomonclla it ends some distance below; the cross veins are less 

 approximate. The wing bands are too dimly brought out in the 

 figure. 



Length, 2.5 to 3 mm. 



Three males from Southern California. Considerable variation 

 exists in the depth of color of the body and wings. 



Two other males (PI. VI, f. 4) from same locality show varietal 

 differences, perhaps, in the wings. The hyaline space between the 

 first and second bands is narrower; the similar space separating the 

 second and third bands is somewhat shorter; and the one between 

 the third and fourth bands stops abruptly at the third vein; the cross 

 veins are slightly more approximate. In other respects they agree 

 with the foregoing. 



POLYMORPHOMYIA n.gen. 



Front narrow; eyes very large and cheeks exceedingly narrow; 

 thorax greatly rounded, globose; scutellum rather flat, four bristled; 

 abdomen short, rounded, convex; ovipositor short, flat, triangular; 

 pile of whole body stubble-shaped, or almost like short bristles, easily 

 rubbed oft". Wings very broad, convex anteriorly and posteriorly, 

 tip obtusely rounded; a black An'ura-like picture; cross veins nearly 

 in the same line, oblique; lower distal corner of discal cell widely 

 prolonged; anal cell also widely drawn out at lower corner; third 

 vein bristly. 



Here is displayed a remarkable combination of characters. The 

 pattern of the wing coloring strongly resembles that of Aciiira; the 

 hyaline distal lunule is repeated in Plaiystonia luniilaia (figured by 

 Macquart, Dipteres Exotiques, 4th Supplement, PI. XXVI, f. 3); the 

 proximity of the cross veins and the stubble-like pile point to 

 CEdaspis; and the prolongation of the lower corner of the discal cell 

 is found in the exotic genera Anomoia and Ceratitis. 



Polymorphomyia basilica n. sp. (PI VII. f. 1 ) 



Female. Black shining; pile of whole body whitish, sparse and 

 stubble-shaped or almost scale-like; bristles black. — Head obscure 

 yellow; front more reddish, rather narrow, not at all prominent, with 

 pile as described above and black bristles. Antennae nearly reaching 

 oral margin; third joint rounded anteriorly. Face receding a very 

 little; edge of mouth not projecting; proboscis short, flaps not geni- 

 culate. Eyes large. Cheeks extremely narrow. Occiput black. 

 Thorax globose, the characteristic pile thinly covering the dorsum 

 and pleurae; the first of the two pairs of dorsal bristles are sutural. 

 Scutellum moderately large, rather flat, four bristled. Abdomen 



