v\ot)V 
Vol. XXVII, pp. 151-172 August 13, IQM 
PROCEEDINGS 
or THK 
BIOLOGICAL SOCIETY OF WASHINGTON 
STCDIES IN TUBULIFKUOUS THVSANOPTKRA. 
BY .1. DOUCLAS IIOOJ). 
I'. S. HioloKioal Survey. 
Ill PKHi the order ddiysanoptera embraced fewer than two 
hundred described species, and of these not more than forty 
wi're recorded from America. The task of revising such a small 
group seemed then to present few dithciilties, and tlie comple¬ 
tion of the work within a reasonably short time a])peared 
certain. Now, eight years later, the number of described 
sp(‘cies is thrice as great and raiiidly approaching the thousand 
mark; while the North American list alone has surpassed the 
world’s total of 1906. 
Notwithstanding this progress, most of the recent forms cer¬ 
tainly awaitdiscovery and deseriiition, for Asia, Africa, Australia, 
and South Aim'rica are virtually terra incognita to the Thysano]i- 
ti'rist. Until more descriptive work has been done and the fossil 
spc'cies carefully studied, it will he impossible to propose a 
much moi'c' satisfactoiy generic classilication of the order than 
tlu' early arrangement by Uzel, based largely ui)on such charac¬ 
ters as scul|)ture, relative iiroportion, and form. 
The writ('r has thus limited his studies largely to the main¬ 
tenance of a catalogue* of tlu^ known 1 hyStanoj^teia, and of a 
monograph of the American species occurring north of the 
Isthmus of Panama, l^lach will be published when it has at¬ 
tained a fair degree of com[deteness or gives promise of lasting 
u.se to students of the order. In the mean time, as in the past, 
new taxonomic groups will be diagnosed as rapidly as possilele, 
and nomenclatorial questions discussed, in brief preliminary 
papers. 
:j4—I’KOC. Siol... Srjc. Wa^h., Vyi., XXVll, 1014. (f’l' 
