2l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I4I 



comes entangled in the nest. In an examination of 40 nests, remains of 

 6 K. discoidalis were found. 



Latrodectus mactans (Fabricius) 



Common names. — Black widow, hourglass, or shoe-button spider. 



Natural prey. — Cockroaches, Puerto Rico (Petrunkevitch, 1930). 

 U.S.A., Florida, on shipboard (Anonymous, 1939) : This is a pre- 

 sumptive host record, as the spiders were not reported as having been 

 seen eating cockroaches ; however, heavy infestations of both were 

 found together. 



Family LYCOSIDAE 



Lycosa helluo Walckenaer 



Experimental prey. — Young nymphs of Diploptera punctata, 

 U.S.A. (Eisner, 1958) : Larger nymphs and adults repelled the spider 

 by ejecting a repellent secretion, which has been identified as a mixture 

 of /?-benzoquinone and its derivatives by Roth and Stay (1958). 



Lycosa sp. 



Experimental prey. — Supella supellectilium, U.S.A. (Roth and 

 Willis, unpublished data, 1953) : The lycosid (pi. 30, B-E) was prob- 

 ably L. avida Walckenaer (tentatively identified by Dr. B. J. Kaston 

 from a photograph). 



Order ACARINA 

 Family PHYTOSEIIDAE 

 Blattisocius tineivorus (Oudemans) 

 Synonyrny. — Blattisocius triodons Keegan [Baker and Wharton, 



1952]. 



Natural host. — Blattella germanica, U.S.A. (Keegan, 1944) : 

 Three mites found on 238 cockroaches examined ; others taken in 

 debris from floor of cockroach cage (Keegan, 1944). Members of 

 this family are predaceous (Baker and Wharton, 1952). 



Family LAELAPTIDAE 

 Blattilaelaps nauphoetae Womersley 



Natural host. — Nauphoeta cinerea, Australia, Brisbane (Womer- 

 sley, 1956). 



Coleolaelaps (?) sp. 



Natural host. — Gromphadorhina portentosa, the hosts were im- 

 ported into U.S.A. from Madagascar via Europe (Roth and Willis, 



