THE CANADIAN ENTOMOLOGIST. 215 



the veins, or indicate their place when the veins themselves are obliter- 

 ated. By means of these series of longer hairs there can be located between 

 the submediana and post-costa three obliterated, or rather undeveloped, 

 veins in 0. IVestwoodi. I can not find any sure trace of the sieve-plate, 

 which is common at the base of the wings of the Psocina, unless it is 

 represented by a short double series of approximated larger holes near 

 and partly upon the base of the post-costa. The coloration of the wings 

 is remarkable, being blackish, fuscous, fuliginous, or at least fumose, with 

 five narrow white longitudinal bands between the veins. As these bands 

 follow longitudinal folds or deepenings of the membrane ^^between two 

 veins, they perhaps represent undeveloped veins. But I was not able to 

 discover a series of longer hairs in these white bands. Moreover the 

 smoky dark wings of the Termitina with a number of undeveloped veins, 

 never show similar white bands, which indeed seems to be characteristic for 

 Embidina. The ingenious assumption of Mr. Wood-Mason, 1. c. p. 633, 

 that the white bands represent the original hyaline color of the wings, and 

 that the dark veins are broadly bordered on both sides with brown or 

 black-smoky, as to leave only narrow streaks of the ground color visible, 

 is worthy of consideration. Of the veins, the sub-costa on its origin and 

 the post-costa are usually the darkest and largest ones, but the mediana 

 is the largest in its whole length except at base. The mediana is accom- 

 panied on both sides by a dense series of rugosities which form (Olyntha) 

 together with both margins of the mediana, four approximated blackish 

 lines. 



With the intention to make my descriptions easy for comparison and 

 to avoid any confusion, I have always used the names of the veins given in the 

 descriptions of Westwood, McLachlan and Wood-Mason. I give here 

 the nomenclature of the veins used by me in all my neuropterological 

 papers since 1846, because the origin and the comparative value, and the 

 homology of the veins, become more evident. My detailed paper on the 

 wings and veins of the Odonata, made in 1846, was to be printed at the 

 end of the monographs on Odonata, and the nomenclature was accepted 

 by De Selys-Longchamps and used in all subsequent papers. The mono- 

 graphs of the four sub-families still wanting were interrupted, and the 

 parts ready for the general volume (wings, antennas, legs) remain still 

 unpublished. I had then of course not known the nomenclature used by 

 Heer, in which Kirby's names are partly accepted, as his work was pub- 

 lished in 1847. As Heer's nomenclature has never been used except in 



