OF WASHINGTON. 81 



cross- nerve ; s and /, areal and anal cross-nerves, and ^, humeral 

 cross-nerve. With the cells, the few that are referred to in the 

 anterior wings agree with my system ; in the posterior wing the 

 lanceolate cell (4) is strangely enough called the anal cell. 



The most important of the cells on classificatory grounds is 

 the lanceolate cell of the anterior wings, which is peculiar also 

 to the Tenthredinidae. It assumes in different genera three dis 

 tinct types, each presenting variations of value, i. It is petio- 

 late, as in Nematus, Fig. 3, (i), when the accessory vein joins 



the anal vein and terminates re 

 motely from the base of the latter. 



2. It is contracted when the 

 accessory vein coalesces with the 

 anal for a distance at the centre, 

 called contracted when widely so 

 as in Hylotoma, Fig. 3 (2), or 

 subcontracted when narrowly so 

 as in Pachyprotasis, Fig. 3 (3). 



3. It is open when the accessory 

 vein extends independently to the 

 base of the wing without meeting 

 the basal simple or without cross- 

 vein as in Selandria, Fig. 3 (6) ; 

 with oblique cross vein as in 

 Dolerus, Fig. 3 (4) ; and with 



FIG. 3.-Different types of lanceolate cell Straight Cl'OSS Vein as in Teilthredo. 

 in Tenthredinidse. See text for de- "Pip- ? fr"\ 

 scription (original). &' O \J/' 



Next in' importance are the 



radial and cubital cells of the anterior wings the former never 

 more than two, but sometimes with an appendiculate cell, and 

 the latter never exceeding four nor less than three. In the hind 

 wings the discal cells are of the most importance their number, 

 when present, and relative size giving good characters. The 

 lanceolate cell (Konow's anal cell) also occurs in two distinct 

 forms, viz : either with the accessory vein received a greater or 

 less distance in front of the transverse median (s) or interstitial 

 with this cross vein. 



With the veins the more important features are in the cross 

 veins, their number and position relative to each other and the 

 cells which they join. Of the longitudinal veins it may be noted 

 that the costal extends entirely to the apex of the wing and in 

 cludes the peculiar enlargement called the stigma, the size and 

 shape of which latter affords good generic and specific characters. 

 On the hind wing, near the middle of this vein, occur a number 

 of minute hooks which clasp the thickened hind border of the 



