592 riiOCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



first anal cell as in Paururns; in Xi])hydria (fig. 85) it joins M^ at 

 the base, being- almost interstitial with the medio-cubital cross-vein, 

 and the first anal cell at middle; and in Tremex (fig. 91) it joins the 

 cell M distinctly before the medio-cubital cross-vein and the first 

 anal cell on its basal fourth. In most other Tenthredinoidea it joins 

 the cell M^ just before, at, or just beyond the middle, is either trans- 

 verse or inclined toward the apex of the wing, and joins the first anal 

 cell near the middle, except in the genus Lah/darge (fig. 78), where it 

 joins it near the apex, a secondary modification due to the coalescence 

 of the veins at the apex of the first anal cell. In the subfamily Ten- 

 thredininaj it joins the cell M^ at base just in front of the medio-cubital 

 cross-vein and inclines strongly toward the apex of the wing. In the 

 genQVdi 2fegalodoutes{^g. 92), 6*/'y-y«?^s(fig. 97), Trlckio,soma{ii^. 59), and 

 Perga (fig. 84), it is interstitial with the medio-cubital cross-vein and 

 likewise inclined toward the apex of the wing. In the genus Perreyla 

 (fig. 80) there is a marked convexity in the veins Cv\ and Mj with the 

 convexity turned toward the anal veins, the free part of Cuj+M^ start- 

 ing oft' at the point of greatest convexity and inclining strongly toward 

 the base of the wing. This condition seems to be characteristic of 

 practically all the species of this subfamily. 



All vestige of the free part of the vein Cu,^ is wanting except in cer- 

 tain species of the genera Panqyhilius (fig. 39), Cephaleia (fig. 42), 

 Bactroceros (fig. 41), Lyda (fig. 37), and Cmnolyda (fig. 38) of the 

 Lydida?, and the species of the genus Piurunis (fig. 86). The position 

 of the free part of this vein is represented in various other genera of 

 Siricidffi, as Sirex callfornicus (fig. 87), l)y a minute spur. In the 

 remaining genera of the family Lydida% where the fi-ee part of this 

 vein is wanting, the prominent bend indicating the usual location of 

 this vein is as prominent as in those genera where the vein is present, 

 but even this bend is wanting in all other Tenthredinoidea. 



THE ANAL AREA. 



As already described, the wing area inclosed by the three anal veins 

 has been named the lanceolate cell by the students of the Tenthredin- 

 oidea. This so-called lanceolate cell is in reality two cells, 1st A and 

 2d A. The front margin of the first anal cell is formed for the most 

 part by the coalesced veins, 1st A, Cuj, Cug, and M^; its hind margin 

 is formed by the combined 2d A and 3d A. The front margin of the 

 second anal cell is formed for the most part by the coalesced 1st A 

 and 2d A; its hind margin is formed by the 3d A. The cells 1st A 

 and 2d A are sepai'ated by the free part of 2d A, which extends trans- 

 versely and is generally spoken of as the cross-vein of the lanceolate 

 cell. 



The lanceolate cell is found under five ditterent forms: First, open 

 at the shoulder with an oblique or sti-aight cross-vein; this is the form 

 found in the typical hymenopterous wing and is of most frequent 



