Experiment Station Record, Volume 92, January-June, 1945 Page: 94
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94 EXPERIMENT STATION RECORD [Vol. 92
ft. wide and 8 to 15 in. deep with sandy-mud bottoms, a current of 1.5 to 2 ft. per
second; and considerable plant growth and shade provided a favorable breeding
habitat for this species.
Limited observations indicate that the general behavior and feeding habits of
S. slossonae and S. nigroparvum are similar. The text is supplemented by numerous
Notes on Oklahoma bot flies, G. W. EDDY and K. C. EMERSON. (Okla. A. and
M. Col.). (Jour. Kans. Ent. Soc., 17 (1944), No. 2, pp. 78-79).
The fleas (Siphonaptera) of Alberta, with a list of the known vectors of
sylvatic plague, J. H. BROWN (Ann. Ent. Soc. Amer., 37 (1944), No. 2, pp. 207213).-Annotated
lists are presented of the fleas of Alberta and of the hosts from
which plague vectors have been recovered.
Biology of the cattle biting louse and notes on cattle sucking lice, J. G.
MATTHYSSE. (Cornell Univ.). (Jour. Econ. Ent., 37 (1944), No. 3, pp. 436-442,
illus. 4).-The incubation period for Linognathus vituli (L.) and Solenopotes
capillatus Enderlein under winter barn conditions on dairy heifers averaged 11 days;
that of the short-nosed cattle louse, 13 days. The oviposition rate of the last and
S. capillatus was 1-2 eggs' per day; for L. vituli, 1 per day. Reared under controlled
conditions, the optimum temperature for the cattle biting-louse appeared to be 95
F.; the optimum relative humidity, 75-84 percent. The probable cycle of this louse
on the host in winter was apparently for the egg 8 days; first instar 7 days, second
5.5, and third instar 6 days; preoviposition period 3 days; complete cycle 29 days;
and oviposition rate 1 egg per 35 hr. per 9. Normal reproduction is by parthenogenesis;
this louse was maintained through two generations with no $ $ introduced
or produced. In natural infestation, $ 8 are present in small numbers but are
most numerous in rapidly decreasing populations; thus they probably serve some
function in the biology of the species'. A temperature of 100 proved too high for
maintenance of populations, and 125 was fatal within 1 hr. Since the normal skin
temperature of heifers in summer in northern areas approaches 100 and the action
of direct sunlight raises the skin temperature to over 125 in 2 min., it would appear
that the winter areas of infestation on heifers are unsuited to maintenance of populations
of the cattle biting-louse. Skin temperature is highly important in influencing
the relative abundance of cattle lice in both winter and summer in northern areas,
but this is not meant to imply that humidity, light, diet, and skin condition are not
Methods for collecting ticks for study and delineation, E. T. BOARDMAN.
(Univ. Fla. et al.). (Jour. Parasitot., 30 (1944), No. 2, pp. 57-59).-Methods
are described for collecting ticks from soil, vegetation, and host animals. It is
important for diagnostic purposes that ticks be killed in an expanded condition;
a solution of 3 parts ether and 97 parts 20 percent ethyl alcohol was found to kill
them with appendages expanded and also proved useful in killing many different
arthropods-both aquatic and terrestrial. Preferably ticks and other arthropods'
should be transferred to a solution of 1 part glycerine and 9 parts 75 percent alcohol
for final storage; the more highly chitinized species, however, may be dried. An
outline of a modification of Bethe's method for staining chitin is suggested for
studies of small clear chitinized structures.
The genus Amblyomma (Ixodidae) in the United States, R. A. COOLEY and
G. M. KOHLS (Jour. Parasitol., 30 (1944), No. 2, pp. 77-111, illus. 12). -Publication
of a review (61 references) of this genus of ticks in the United States was
undertaken because of the increasing interest in its members as known or suspected
carriers of diseases and especially because of the need of criteria for the specific
identification of the larvae and nymphs. The present paper is based largely on
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/107/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.