431] LARVAE OF THE TENTHREDINOIDEA—YUASA 113 



that the specimens which Patten (1878) reared from Betula nigra and 

 regarded as X. attenuata Norton do not belong to this species but are 

 similar to an undescribed female bearing a Bradley manuscript name. 

 Nothing is known concerning the immature stages of Konowia basalts 

 Say. The larvae of Xiphydria are wood-borers and confine their attacks 

 to dead and decaying wood of deciduous trees. European species infest 

 willows, poplar, elm, and birch, and American species, maple, hickory, 

 and birch. Konow (1901) listed four species, Xiphydria prolongata, X. 

 camelus, X. longicollis, and X. abdominalis in his key to the larvae of 

 Tenthredinoidea. 



Xiphydria Fallen 



Larvae comparatively small; thorax distinctly swollen, the meta- 

 thorax being the largest segment of the body; abdominal segments 1-2 

 cylindrical, subequal in diameter; third abdominal segment with a single 

 annulet; two caudal segments somewhat globose; sublateral lobe moder- 

 ately large, extending the entire length of the segment; suranal process 

 comparatively long, with dentiform tubercles near the base; tenth ab- 

 dominal sternum much smaller than the tergum; head and ultimate 

 segment with long setae; head semiglobose, vertical furrows present; 

 epicranial suture in part indistinct; antennariae distinct; antennae three- 

 segmented, segments 1 and 2 ring-like, segment 3 conical, longer but of 

 much smaller diameter than the preceding segments; labium very small, 

 without median emargination; mandibles with distinct dentes; maxillae 

 with small modified palpi, apparently two-segmented; galea conical, 

 smaller than palpi, lacinia fleshy, tubercle-like, with several setae; labium 

 with submentum and mentum large, convex, membranous, palpi appar- 

 ently with three segments, small, median lobe large, flattened on venter, 

 suboblong; spiracles large, oblique, not winged; glandubae wanting. 



Xiphydria provancheri Cresson. — Length, 12 mm.; width of head, 

 1.6 mm.; body yellowish white; head creamy white; mouth-parts brownish; 

 suranal process arising from large brownish strongly chitinized suranal 

 lobe, deep brown, at proximal end, more than twice as long as wide, 

 distal two-thirds suddenly and distinctly smaller in diameter than proximal 

 third, with two circular rows of dentiform tubercles and setae on the 

 proximal third and two distinct ventral dentiform tubercles on the distal 

 third, one caudad of the other, these without setae; on birch. 



This description is based upon a rare specimen collected at Saranac 

 Inn, New York State, Aug. 20, 1900, and generously loaned by Dr. E. P. 

 Felt. The larva bores into partly decayed heartwood of standing birch 

 and makes a gallery about 2.5 mm. in diameter. The burrows are invari- 

 ably filled with the borings, except a short curved portion thru which the 

 adult makes its way to the surface. A parasite, Pammegischia xiphydriae 

 Ashmead, was reared by Dr. Felt from larvae of this species. 



