May, 1914.] The Cheese Skipper. 313 



tions longer periods occur. In fact, it is probable that larvee de- 

 veloping late in the season pass the winter in the pupal stage. 

 The imago emerges by splitting off the antero-dorsal depressed 

 area. (Fig. 16.) 



The Adult. (Figs. 1,2.) 



The specific description of Piophila Casei Linne is inaccessible 

 to the writer. The following, therefor, is a redescription of the 

 species based upon only a dozen or so specimens and consequently 

 is not as complete as it should be. 



Male: — The dominant color is bronzy black; length to tip of 

 abdomen 3.4 mm. to 3.9 mm.; to tip of wings 4.4 mm. to 4.5 mm. 



Head (Fig. 2) : Palps and proboscis fuscous, covered with 

 many bristles. Face, yellow to fuscous, excavated; antennse 

 short, not reaching to oral margin, fuscous, non-porrect; non- 

 setose arista; short bristle on second segment of antenna; cheeks, 

 yellow to fuscous. Front fuscous immediately above the anten- 

 nae to bronzy black beyond ; vertical triangle smooth, shiny black, 

 bears three ocelli and a pair of ocellar bristles just posterior and 

 lateral to anterior ocellus; compound eyes bare, color red. Bris- 

 tles: vibrissae present; also several bristles on lower edge of each 

 cheek ; post orbital bristles present ; vertical bristles 2 pair, anterior 

 pair erect convergent, posterior not as erect, divergent; post- 

 vertical bristles extend over thorax, slightly divergent; fronto- 

 orbital, a series of short bristles extending from a point just 

 anterior to the vertical bristles to a point above and opposite the 

 base of the antennae. Row of very short bristles on ridge around 

 antennal pit extending from vibrissae on the left, around base of 

 antennae to the vibrissas on the right. 



Thorax: Bronzy black with 3 distinct rows of regularly 

 placed short setae; Scutellum, same color, bears 2 pairs of long 

 setae or bristles and several transverse parallel rows of short setas, 

 not easily observed. Sides, — same color, each bearing several 

 long setae. Legs: Covered with short spines; coxa yellow to 

 fuscous; femur, fuscous at joints, middle blackish-brown. An- 

 terior leg, — tibiae, except at proximal joints, and tarsi, blackish- 

 brown. Middle and hind legs, — Tibiae blackish-brown to fuscous, 

 fuscous at joints, tarsi fuscous. 



Abdomen: Rectangular, sides somewhat parallel, tip blunt. 

 Same color as thorax. Six visible segments, each bearing many 

 short spines. 



Wings: Overlap nearly to tips when fly is at rest. Wholly 

 hyaline, irri descent, auxiliary vein indistinct or closely apposed 

 to the sub-costa; halteres, pale yellow. 



Female: — Same color as the male. Length to tip of abdomen 

 3.9 inm to 4.1 mm; to tip of wing 5 mm. to 'y.'I mm. Abdomen, — 

 six visible segments, pyriform. 



