N0.143S. WINGS OF THE TENTHREDLYOTDEA—}fACGILLirRAY. ()27 



costa is wanting'. The stigina is a broad oval area like that of the Xyel- 

 idte. The radial sector separates from K, distinctly before the stigma 

 and extends to the wing margin along R., in a regular curve. The apex 

 of the cell 2d Rj + R, is broadly rounded, just as in the generalized 

 Tenthredinoidea and Megalodontidi^ (tig*. 1)2). The radial cross-vein is 

 joined to the stigma at its apical fourth and to the vein R3+^ near the 

 middle of the cell R^. The radio-medial cross-vein is wanting. Media 

 separates from radius a short distance in front of the radial sector; it 

 extends transversely for a short distance, then extends in a broad 

 bow-like l)end to the point of separation of M^+.-, and M3+^, nnich as in 

 Bacf/'occ/v.s (tig. 41) and Ityorx'ia (tig. 40). The anterior end of the 

 medio-cubital cross-vein is joined to media at the posterior end of its 

 transverse part and the posterior end of the cross-vein to cubitus just 

 beyond its middle, the cross-vein extending- from this point to media 

 in a prominent curve, so that the cell M^ is in the shape of a semi- 

 circle. The cubitus is a straight vein, closely appressed to Sc+R+M at 

 the base of the wing, but not coalesced with it. The free part of 

 Mj + Cu^ is situated near M^, as in the Lydidse, the vein being trans- 

 verse instead of oblique. The anal cell is of the form found in the 

 typical wing. In the hind wings the cell R^.^ is ))luntl3' rounded as in 

 the fore wing and they ditt'er from the Lydida^ only in Avanting- the 

 subcostal vein and in that the transverse part of media is nearer the 

 apex of the wing. 



Almost every writer who has studied this species has located it in 

 a difl'erent place. It has l)een placed in the sul)family Ilylotominje 

 (tigs. 76-79), oi- as a separate subfamilv, or as a tribe near the general- 

 ized Tenthredinoidea. It has affinities with the generalized Tenthredi- 

 noidea in the shape of the stigma, the shape of the apex of the cell R.^, 

 and the position of the medio-cubital cross-vein. It is allied to the 

 family Tenthredinid.T? (figs. -1:5-84), in the course of the base of the 

 radial sector and in the position of the radial cross-vein. It ditlers 

 from the generalized Tenthredinoidea and the generalized Tenthredi- 

 nida^ in the constriction of the area between costa and Sc+R + M. 

 These characters indicate it as a pi'imitive foi-m closely related to the 

 family Tenthredinida\ which tinds its proper location as a distinct 

 family just before the Tenthredinida. 



Toitltredinldn'. — A large family with numerous subfamilies, genera, 

 and species, found in all parts of the world. The stigma is of moderate 

 size, ovate in outline. The costa in most of the species is distinctly 

 thickened toward the apex. The area between costa and Sc+R+M 

 is of varying width, the sul)costa is represented only by the free part 

 of Scj, and only in rare cases is all trace of this wanting. The radial 

 cross-vein is joined to the stigma near its apex and to ^.^^^ near 

 the apex of the cell R^, The radial sector extends from the l)ase of the 

 stigma in a i-egular curve. In many genera the angle between the 



