BIOTIC ASSOCIATIONS OF COCKROACHES — ROTH & WILLIS 217 



unpublished data, 1958) : The mites (pi. 12, C) were tentatively de- 

 termined by Dr. E. W. Baker. 



Hypoaspis sp. 



Natural host. — Pancsthia australis, imported into U.S.A. from 

 Australia (Roth and Willis, unpublished data, 1955) : Cockroach 

 determined by J. A. G. Rehn. Generic determination of mite made by 

 Dr. R. W. Strandtmann (Gamin, personal communication, 1955). 



Family UROPODIDAE 



Uropoda sp. 



Natural host. — Blattella hmnbertiana, Formosa (Takahashi, 1940). 

 Nymphs of the cockroach may be destroyed (Takahashi, 1940). Urop- 

 odids frequently attach themselves to insects, especially in nymphal 

 stages but probably are harmless (Baker and Wharton, 1952). 



Family DIPLOGYNIIDAE 

 Undetermined diplogyniid 



Natural host. — Pancsthia australis, imported into U.S.A. from 

 Australia (Roth and Willis, unpublished data, 1955) : Gockroach 

 determined by J. A. G. Rehn. According to Dr. J. H. Camin (personal 

 communication, 1955) this is a new genus and new species in the sub- 

 family Diplogyniinae, and is most closely related to the genus 

 Lobogynioides. Mites of this family live as ectoparasites and com- 

 mensals on beetles and possibly other insects (Baker and Wharton, 

 1952)- 



Family ANOETIDAE 

 Histiostoma feroniarum (Dufour) 



Natural host. — Pycnoscelus surinamensis , Germany (Roeser, 

 1940) : Though not parasitic, the mites at times became so numerous 

 that the insects were hindered in their movement, were unable to feed, 

 and died. The mites were introduced with soil and leaves and had 

 originally been attached to millipedes, waterfleas, and sowbugs. 



The deutonymphs, hypopial forms, or travelers are found on insects ; 

 the other stages are found in decaying organic matter (Baker and 

 Wharton, 1952). 



Family ACARIDAE 

 Caloglyphus spinitarsus (Hermann) 

 Natural host. — Pycnoscelus surinamensis, Germany (Roeser, 

 1940) : See notes following Histiostoma feroniarum above. 



