1962] 
Crabill — Da/noth, us 
85 
available from the literature. Included are all of the genera now 
known from North America including Mexico. 
Excluded are three genera which had been previously reported from 
the area under discussion: Leptodampius Chamberlin, 1938, p. 255; 
Diplochora Attems, 1903, p. 281 ; Paraplanes V erhoeff , 1933, p. 22. 
The original description of Leptodampius is not sufficiently full and 
detailed to permit its confident placement within my key. The recent 
examination of the holotype of fusata Attems, the type species of Diplo- 
chora, shows it to be referable to T omotaenia Cook (new synonymy), 
and to the subgenus Korynia Chamberlin. VerhoefPs Californian 
Paraplanes calif ormicus, whose types I have studied at Munich, all are 
referable to T omotaenia fusata (Attems) (new synonymy). The 
details of these cases will be discussed in a separate paper soon to be 
issued. 
1 a. Each coxopleuron with two subsurface gland-pits, but without 
freely-opening and exposed pores. ( Mexico) 
Pagotaenia Chamberlin 
ib. Each coxopleuron with freely-opening pores most or all of which 
are exposed. Subsurface gland-pits absent. 2 
2a. Prehensorial tarsungula with 1 or 2 prominent basal denticles 
4 
2b. Prehensorial tarsungula without a basal denticle 3 
3a. Coxopleural pores numerous, opening over most or all of coxo- 
pleural surface. Ultimate pedal sternite narrow and elongate. 
(Idaho). Zantotaenia Chamberlin. 
3b. Coxopleural pores few in number and opening only along and 
under the margins of the ultimate pedal sternite which is wider 
than long, (southeastern United States) A gathothus Bollman 
4a. Tarsungula with 2 prominent basal denticles. (Utah) 
Damothus Chamberlin 
4b. Tarsungula with 1 prominent basal denticle 5 
5a. Ventral pore-fields absent. (California) 
I\I aloe hora Chamberlin 
5b. Ventral pore-fields present 6 
6a. Coxopleural pores concentrated along and beneath margins of 
ultimate pedal sternite; this sternite always wider than long. 
(United States, Missouri westward to the Pacific Coast; eastern 
Asia) T omotaenia Cook ( sensu lato 2 ) 
2 If T omotaenia is divided into subgenera on the basis of the presence or 
absence of sutures on the ultimate pedal pretergite, then the oldest available 
