130 



2A0. Fryxell, P. A. 1974. The unresolved mystery of Cienfuegosla intermedia . 



Southwest. Nat. 18: 479-481. 

 Cienfuegcsia intermedia Fryx. was described on the basis of a single specimen 

 discovered in the Leiden herbarium (L.). The label says only: "Mexico, Mendes, 

 2" and includes a set of initials that can be interpreted as "HB DC." It was 

 not known then (nor is it now) if "Mendes" refers to the collector or to a 

 locality. Recently, a second specimen of this species has been discovered in 

 the herbarium of the University of Texas (TEX). Its label says: "Mexique, 

 Leon, Bdr., 1844." A subsequent annotation adds: "Bdr. = Berlandier." 

 Cienfugosi a intermedia occurs in northern Mexico and is critically situated 

 geographically for possibly playing a role in the spread of the boll weevil 

 from the tropics to the cotton belt in the southeastern United States. 



241. , and Lukefahr, M. S. 1967. Hampea Schlecht.: possible primary host 

 of the cotton boll weevil. Science 155: 156o-1569. 



The boll v;eevil severely infests buds in natural stands of Hampea sp. in 

 Veracruz, Mexico, The geography and ecology of these trees suggest that 

 they may be the long-sought primary host of the boll weevil. 



242. Purr, R. E., and Merkl, M. E. 1967. Residual toxicity of three phosphorus 

 insecticides to the boll weevil. J. Econ. Entomol. 60: 748-750. 



The residuai toxicity of 3 phosphorous insecticides to the boll weevil, Anthonomus 

 grand is Boheman, was determined hourly for 24-48 hours by using field cages made 

 of ice cream cartons. The cages were an improvement over those formerly used and 

 should facilitate such studies of similar chemicals and insects. Azinphosmethyl 

 at 0.25 lb per acre was effective for 12-24 hours and at 0.5 lb per acre, for 

 more than 24 hours. Methyl parathion at 0.25 and 0.5 lb per acre was effective 

 for only 2-4 and 4-6 hours, respectively. Malathion ac 0.5 lb per acre gave 

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