128 ME. E. M'lACHLAN on new rOEMS, ETC., 



Long. Corp. 3J lin. ( = 7 mill.)j long, antenn. 16 lin. (=34 mill.); exp. 

 alar. 12 lin. ( = 25 mill.). 



Hab. Venezuela {Goring), in Mus. auct. 



Testaceous yellow. Head and palpi clothed with yellowish hairs j 

 antennae pale yellow, the apical half ot each joint pale brownish, not 

 toothed internally. Legs yellow, with yellow pubescence. Abdo- 

 men pale yellow : app. sup. flat, lanceolate, pale yellow, with long 

 concblorous fringes j app. inf. two-jointed, yellow, the first joint 

 somewhat swollen, the second ovate, shorter, turned slightly inwards, 

 the extreme tip reddish-testaceous j between and beneath the app. 

 inf. is the short broad penis (or cover?), which is deeply concave 

 beneath and blackish internally, the margius thickened. (PI. III. 

 fig. 12.) 



Anterior wings subhyaline, clothed with golden pubescence, which is 

 thin in the basal portion, but becomes denser and slightly brownish 

 in the apical ; apical fringe pale brown ; apical margin obliquely trun- 

 cate ; veins very pale yellowish ; first apical cellule not reaching the 

 anastomosis, petiolate and acute. Posterior wings whitish, subhyaline, 

 the pubescence with a slight yellowish tinge ; fringes very pale yel- 

 lowish or whitish ; veins pale. 



Note on Genus Pseudgnema, M'LacMan. 



"With a view to testing the value of Brauer's suspicions 

 (' Eeise der Novara,' Neuropteren, p. 14) that P. obsoletum, de- 

 scribed by me in 1862, might probably be the same as Tetracen- 

 tron sarothropus, Brauer, I have lately made a reexamination of 

 the type in Mr. Dale's collection. There can be no doubt of the 

 identity of my species with that of Brauer, the generic descrip- 

 tion of Pseudonema being faulty, in consequence of the typo 

 having been mutilated. This is one of those cases in which the 

 older name may very justly be forced to give way to a later one : 

 henceforward I consider P. obsoletum merely a synonym of T. 

 sarothropus. Priority in nomenclature should, no doubt, be a 

 rule absolute, as the only means of avoiding constant alterations 

 depending upon what is a " correct description," as defined by 

 individual caprice ; but, as there is no rule without an exception, 

 I think that when an author, as in my case, willingly discards a 

 name given by him, succeeding writers should accede to his 

 expressed wishes. 



