8 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 70 



Klin, Fairfax County, Va.. March 20, 1924. Adults emerfied ^Slarch 

 24, 1924, C. T. Greene, collector. 



Pupa {fg. 9). — Light amber yellow; semitransparent; thorax 

 more shining than the abdomen; abdomen nearly cylindrical. The 

 antennal capsule is annulated and more reddish yellow than the 

 head; on the upper edge of the base of the capsule and pointing 

 outward is a hornlike, cylindrical projection, and at the base is one 

 large bristlelike hair; between the bases is a deep groove, and 

 apically on the head is a small plate Avith four rounded punctures; 

 head capsule smooth Avith the ocellar depressions well defined; im- 

 mediately in front of the sinuate posterior suture, and on each side 

 of the median line, is a transverse row of eight or nine slightly 

 elongate depressions or punctures. Thorax nearly as wide as long; 

 just back of the middle of the lateral margin is a large single bristle ; 

 at the anterior portion, on the dorsum, are four rounded depressions, 

 and just back of these is a transverse, slightly arcuate row of similar 

 depressions; on each dorsal anterior angle of the thorax is located a 

 thoracic spiracle (fig. q) ; these spiracles are slightly more reddish 

 than thorax and have a raised black ridge : upon the latter is located 

 the spiracular entrance, which contains a series of small radiating 

 slits arranged in a sinuous line. The abdomen is composed of eight 

 segments; the first segment is rather narrow; the third to eighth of 

 nearly equal length; segments from 1 to 7 have a spiracle (fig. ?), 

 which is very similar to the thoracic spiracle but smaller, and with 

 the ridge more brown than black; below each abdominal spiracle is 

 a spinelike bristle; first segment has a transverse row of four long 

 bristles on its dorsal and more numerous bristles on its lateral portions, 

 while the segments from 2 to 7 have a transverse row of closely set 

 laterally longer bristles, and on these latter segments a broad, trans- 

 verse, rugose band is present along the basal margin; last segment 

 is longer but not so wide as the preceding; it bears a transverse 

 enlargement along which are large bristly spines arranged in groups 

 of four; and it terminates in a large prolongation which apically is 

 split into two conical lobes, each with a blackish point; the ventral 

 sides of the segments from 1 to 7 bear a transverse row of bristles 

 corresponding to those on the dorsal sides; the last segment has two 

 spinelike outward-pointing projections on the venter, near the 

 middle. Leg capsules reach the middle of the third segment. 



Length, 11-14 mm.; width of thorax, 2-3 mm. 



XYLOPHAGUS ABDOMINALIS Loew 



Plates 1 and 2 



Habits. — Larvae are predacious on beetle larvae which were found 

 under the bark of pine. 



