112 ILLINOIS BIOLOGICAL MONOGRAPHS [430 



Suranal process with distal chitinized portion ring-like, shorter than wide, setae on the 

 proximal portion arranged in a semicircular row on the dorsal aspect; subanal append- 

 ages with one or rarely two setae, lateral area of suranal lobe typically with seven setae; 

 introduced from Europe; bores in stalks of wheat pygmaeus Linnaeus. 



Hartigia Schiodte 



Antennae apparently with four segments — according to Middleton 

 (1917) with five segments — segment 4 longer than segment 3, elongate, 

 conical; suranal process twice as long as wide at proximal end, without 

 strongly chitinized dentiform tubercles, with several whorls of spinous 

 setae; subanal appendages two-segmented, sometimes segmentation 

 indistinct, with accompanying setae separated from the remainder of 

 setae of the sternum; lateral area of suranal lobe with 15-20 setae. 



Hartigia cressoni Kirby. — The larvae of this species have been described 

 in detail by Middleton. They bore in the stems of Rubus in California. 

 The preceding generic definition was based upon specimens obtained thru 

 the courtesy of Mr. Harry S. Smith, of Sacramento, California, and does 

 not quite agree with that given by Middleton (1917). 



Family Xiphydriidae 



Larvae (Fig. 3) small; body subcylindrical, thorax and two caudal seg- 

 ments distinctly swollen; segmentation distinct; annulation obsolete; 

 creamy white, no markings; glabrous; thoracic legs rudimentary, fleshy, 

 mamma-like, without tarsal claws; larvapods wanting; ultimate segment 

 with distinct suranal process, without subanal appendages; ocellarae 

 wanting; mouth-parts modified; maxillary palpi apparently two-segmented; 

 antennae apparently with three segments; metaspiracles functionless, very 

 much smaller than abdominal spiracles; cuticle on dorsum smooth, on 

 venter microscopically, sharply, and densely spinulate; tenth abdominal 

 tergum with deep meso-dorsal depression; wood-borers. 



The Xiphydriidae contains four genera, Derecyrta, Brachyxiphus, 

 Xiphydria, and Konowia, which may be divided into two groups on 

 the presence or absence of the radial cross-vein in the wings. Systematists 

 have generally considered this group as a subfamily of the Siricidae, but 

 MacGillivray (1906) has elevated it to its present standing on the vena- 

 tional characters, which he has proven to be the most generalized of the 

 specialized Tenthredinoidea. Rohwer (1911) would divide the family 

 into two subfamilies, Xiphydriinae and Derecyrtinae, the latter being 

 monobasic. Of the four genera, two are represented in the Nearctic fauna. 



In a recent synopsis of the Nearctic wood- wasps, Rohwer (1918b) 

 tabulates eight species of Xiphydria. He considers that X. walshii West- 

 wood, which MacGillivray (1916) assigned to the genus Konowia belongs 

 to the original genus, although the species was unknown to him, and 

 states that "it is possible that it is provancheri Cresson." Rohwer suggests 



