NEUROPTERA PLANIPENNIA HEMEROBINA. 



primary sector. In Nothochrysa it runs in a perfectly straight course a 

 little below tin; middle of the wing, but higher than in Chrysopa, directed 

 toward but not distinctly reaching the middle of the outer half of the lower 

 margin of the wing, and supporting the lower proximal end of one trans- 

 verse series of gradate veinlets between it and the primary sector. In Tri- 

 bochrysa it runs in a decidedly zigzag course, in the same general direction 

 ;is in Nothochrysa in its proximal half, and then shifts suddenly to a higher 

 le\i;l and follows thereafter a zigzag direction nearly parallel to the costa, 

 through the very middle of the wing, joining, that is, the transverse series 

 of gradate veinlets and making them a part of itself. Tribochrysa further 

 ilill'ers from Nothochrysa and agrees with Palseochrysa in the slender number 

 of secondary sectors or oblique cross-veins, so that the cells are larger and 

 le.-s elongated than in Nothochrysa and Chrysopa, standing thus at a wider 

 distance from Hemerobius. The result of this movement of the first cubital 

 vein is usually a striking inequality of the cells on either side of it, in con- 

 trast to their uniformity in Palseochrysa. There is here, therefore, as in 

 Palaeochrysa, no transverse series of gradate veinlets in the proper sense, as 

 both series are directly united with the two cubital veins. A somewhat 

 similar arrangement may be seen in Nothochrysa fulviceps, although that 

 species differs from these more widely than most of its allies in the multi- 

 plicity of its secondary sectors. The same double cubital cell occurs bel"\v 

 the second subradial cell as is found in Nothochrysa and Palseochrysa 



The species placed here seem to fall into two groups, one of the species 

 dilferinn 1 from the others in being of a considerably larger size, having its 

 lirst cubital vein originate directly from the radius, the proximal cells 

 which lie above it less elongated than in the other species, and the upper 

 (double) cubital cell quadrangular. 



Table of Hie yjH'cies of Tribochnjsa. 



Large spi-eies. I'nst cubital vein arising directly from the radius; first transverse vein connecting 

 radius and lirst cubital vein lying ill direct continuation of the cross- vein closing the proximal 

 rml nl' the donblr riiliital cell, making the upper, as well as the lower, cell quadrangular. 



1. T: vttuxnila. 



Smaller spi < n -.. I'irst cnliiial vein arising from a ba.sal cross-vein unit in>_' the radius and second 



enhiial vein : Mist I rausverse vein connecting radios and first oubital vein striking the nnpcr 



margin nl the donblr rnliital cell, making the upper cell pentagonal, while the lower remains 



quadrangular. 



Klniin.it ril pi "\im.i I i.lK I ie i wren the main sector of the railins and the first cubital vein, four in 



nn i I'.M ! I liy half a do/.m nils of suhc<iual diameters '2. T. inequalin. 



Elongated prorimala cells, aa above, three in number, followed by five cells of aubequnl diameter.-. 



3. T. Krmata. 



