1910] North American Paniscini 195 



shorter than the first abscessa, and extends to the margin of the 

 wing. The anal cell is the longest cell of the wing. It is bound- 

 ed, anteriorly, by the anal nervure and, posteriorly, by the 

 margin of the wing which has a small fold near the extremity of 

 the cell (f renal fold.) This cell extends to a point slightly 

 beyond the outer end of the second discoidal cell. The first 

 apical cell has already been described with the exception of 

 mentioning that its posterior and outward boundary is formed 

 by the margin of the wing. 



HIND WING. 



The costal cell is quite long extending somewhat over half 

 the entire length of the wing, and it is, by far, the narrowest cell. 

 It is separated, posteriorly, from the median cell, by the sub- 

 costal nervure. Anteriorly it is bordered by the costal nervure 

 which extends somewhat less than half the length of the cell, 

 and by the margin of the wing, which is a continuation of the 

 latter. The marginal or radial cell is separated posteriorly 

 from the median cell by the first abscessa of the marginal or 

 radial nervure, and from the submarginal or cubital cell by the 

 second abscessa of the same nervure. Its anterior and outward 

 boundary is formed by the margin of the wing. 



Six frenal hooks are found near the middle of the anterior 

 margin of this cell. Submarginal or cubital cell is separated 

 posteriorly from the discoidal cell by the second abscessa of the 

 cubital nervure, inwardly from the median cell by the transverse 

 cubital nervure, and extends outward to the margin of the wing. 

 The median cell is the longest and largest cell of the wing. It 

 is separated posteriorly from the submedian cell by the extern© 

 medial nervure and from the discoidal by the first abscessa of 

 the cubital nervure. The submedian cell is separated poster- 

 iorly from the anal cell by the anal nervure and from the sec- 

 ond discoidal cell by the first abscessa of the transverse medial 

 nervure which is somewhat longer than the second abscessa, 

 and forms with it approxir^ately a right angle. Outwardly it is 

 separated from the first discoidal cell by the second abscessa 

 of the transverse medial nervure. The discoidal cell is separated 

 posteriorly from the second discoidal by the discoidal nervure, 

 and extends to the margin of the wing. Second discoidal 

 cell is separated posteriorly and inwardly from the anal cell 

 by the second abscessa of the anal nervure and extends to the 

 margin of the wing. 



