276 THE CANADIAN ENTOMOLOGIST 



projects well beyond the line of anterior margin of frons; lower margin of cheek 

 with a few strong bristles in a single series and some short weak hairs, the series 

 of strong bristles widely interrupted below parafacial; third antennal joint 

 broad, about twice as long as second, arista almost bare, second joint longer 

 than thick, third swollen at base. Presutural acrostichals 2 'rowed, one pair 

 strong, prealar bristle long; sternopleurals 2:2, the lower anterior one weak. 

 Abdominal tergites with strong bristles on posterior margins; sternites 3 to 5 

 each with strong bristles on lateral margins, basal sternite bare, genitalia with 

 two slender processes at apex. Fore tibia Avith a strong median posterior 

 bristle, basal joint of fore tarsus nearly as long as the other four combined, 

 third, fourth, and fifth joints broadened, third twice as long as fourth, the 

 latter one- third as long as fifth, which is about three times as long as broad, 

 mid legs lacking, hind femur with about 8 bristles on apical three-fifths of antero- 

 ventral surface, and 1 bristle near base on postero- ventral; hind tibia with 3 

 short antero- ventral, 3 moderately long and 4 short antero- dorsal, and 3 long 

 and 5 or 6 short posterc-dorsal bristles. Costal thorn short; veins 3 and 4 

 subparallel apically, last section of the latter not much longer than the pre 

 ceding section. 



Length 7 mm. 



Type.— Godbout, Quebec, Canada, July 25, 1918, (E. M. Walker). 



This species resembles the female of latipennis Zetterstedt, in having the 

 apical fore tarsal joint dilated, but latipennis has the fourth joint much longer, 

 distinctly longer than wide, the hind femur Vv-ith 2 or 3 bristles on apical fourth 

 of antero- ventral surface, and the hind tibia with 3 long bristles on the postero- 

 dorsal surface, the short bristles being absent. 



Type in the Royal Ontario Museum of Zoology, Toronto. 



NOTES ON PLATYDEMA ELLIPTICUM FAB., 

 AND ITS FUNGUS HOST. 



BY HARRY B. WEISS, NE\V BRUNSWICX. N.J. 



During the middle of September, larvie and pup^e of this species were quite 

 abundant in the fungus Poly poms gilviis at Union, N.J. Many of the larvae 

 were full grown at this time, and adults had just started to emerge. Larval 

 burrows were found throughout the fungus, but most of the pupal cells were 

 located in the ba.se of the fungus close to the bark of the tree. Polyporus gilvus 

 is a woody fungus which is extremely common in Eastern Canada and Northern 

 United States, occurring on dead deciduous wood. 



Full grown larva. — Length 12 mm. Greatest width 1.7 mm. Elongate, 

 subc^viindrical, somewhat hard, whitish or with dark contents of alimentary 

 tract showing. Head and anterior portion of hrst thoracic segment dark, 

 reddish brown. Faint to dark transverse chitinized areas on dorsal surface of 

 each segment. Head with a fine, A^hite, U-shaped line which connects with a 

 fine, median, dcrsal line extending to first abdominal segment. Head bears a 

 few punctures within the U- shaped line and many without. Head and body 

 sparsely hairy. Legs bearing several spine- like hairs. Last abdominal seg- 

 ment bearing a row of five minute spines on its posterior edge, the middle spine 

 being the largest. 



December, 1919 



