NO. 1438. WIN(;S OF THE rEXTHREDINOinEA—MArdllJJVRAY 



587 



Fig. 9.— Origin of the appendiculate 

 CELL, a, Macroxyela ferruginea; 



b, MONOCTENUS JUNIPERI; C, CLAVEL- 

 LARIA AMERINiE; rf, XIPHYDRIA 



camelus; r, Perryia vitellina. 



31-35) and Lydida?. (figs. 36-43) it is an oblique transverse vein situ 



ated near the margin of the wing. In most Tenthredinidje, as Hojjlo 



cant pa (fig. 61), Cladius (fig. Q'd)^ Ten- 



tltredo (fig. 56), and Dlneura (fig. 63), it 



is found in the apical third of the distance 



between the base of the .stigma and the 



apex of the wing, while in a few genera, 



as Lohoceras (fig. 82), Acordulecera (fig. 



S3), and many Hylotomina? (fig. 76), it is 



found near the middle of this area. 



In the apex of the wing of many Ten- 



thredinoidea, as Slrex and Tremex (fig. 



10, ('), there is found a prominent spur- 

 like projection from the apex of the cell 



Ki^_.,. The area included in front of this 



spur has been termed the appendiculate 



cell. As there is no vein forming the 



front margin of this cell, and as this name 



is in general use by the investigators on 



this order, it will f)e used here. The 



origin of the appendiculate cell will l)e 



more readily understood if we examine 



this region first in certain genera where 



the appendiculate cell is not supposed to 

 be present. If the front wing of almost 

 any member of this superfamily be ex- 

 amined in this region, it will be noted 

 that the portion of Rj beyond the stigma 

 does not form the margin of the wing 

 but is set in a short distance from it. 

 This is especially marked in the genera 

 J/atT(?,ry<?/«(fig. 9, «), Tenthrido{^g. 56), 

 Monoctenns (fig. 9, ^), Cladius (fig. 6()), 

 and Strongylogaster (fig. 51). It should 

 be also noted that in all these wings Kj 

 extends beyond the point where it is 

 joined by Rj. This is especially marked 

 in nio^t Cimbicina', as Clavellarla (fig. 

 9, c), where there is also a slight curving 

 down of R^ at the point where R^ joins 

 it. Now if this region at the apex of R^ 

 is examined in the following wings, it 

 will be seen that the formation of the 

 appendiculate cell is only a gradual modi- 

 fication of the condition existing in the wing of (davellarla. In 



Xipkydrla (fig. 9, d}^ the bending down is slightly more pronounced 



Fig. 10.— Appendiculate cell, a, Die- 

 locerus formosus; 6, Pachylota 



AUDOUINII; C, PTERYG0PH0RU.S CINCTU.S; 



(l, Labidaege dibapha; c, Tremex 



FITSCICORNIS. 



