144 
Psyche 
[March 
Fig. 17. Right posterior gonopod of Bollmanella comassia, posterior 
view. Figs. 18-20. B. complicata. Fig. 18. Right posterior gonopod, pos- 
terior view. Fig. 19. Anterior gonopods, posterior view. Fig. 20. Sternal 
process between posterior gonopods. 
found several highly unusual chordeumid species. Bollmanella bi- 
furcata shows some intermediacy in size, pregonopodal leg modifica- 
tions, and gonopod form between species of Bollmanella and Taiyu- 
tyla, and this may suggest that the two genera could be difficult to 
keep separate in eastern Oregon. Loomis and Schmitt (1971) de- 
scribed Taiyutyla curvata, from Montana, but it does not appear 
(from their illustrations) to be very much like B. bifur cat a. 
The types and several other specimens of both sexes were taken 
from cottonwood litter, in a riparian situation. 
Bollmanella bella n. sp. 
Figs. 13, 14 
Types: Male holotype and a juvenile female (not designated as a 
