A PARASITIC ROUXDWORM (AGAMOMERMIS CULICIS X. G.. X. 
SP.) IX AMERICAX MOSQUITOES (CULEX SOLLICITAXS). 
By Ch. ’\\"ardell Stiles, Ph. D. 
Chief o f Division of Zoology, Hygienic Laboratory, United States Public Health and 
Marine-Hospital Service. 
At a time when mosquitoes are subjected to such careful study, 
because of the important relations they bear to public health, espe- 
cially in connection with malaria, yellow fex^er, etc., it is of interest 
to determine what parasites naturalh" infest them. This determina- 
tion has its practical as well as its scientific x’alue, for it enables us to 
eliminate certain nonpathogenic parasitic organisms from the life cycle 
of pathogenic organisms, stages of which may be found in mosquitoes. 
It further has its direct practical bearing in that the parasites of mos- 
quitoes may multiply to such an extent as to become important factors 
in killing the insects, or at least in rendering them less fertile. 
Quite recently several parasites have been described for the Culi- 
cidfe. Eoss (1895) has found intestinal gregarines in mosquito larvae 
in India. Perroncito (1899) has found a filamentous phytoparasite in 
Atiojjhdes collected near Turin, Italy. Lax’eran (1902) has described 
a pathogenic yeast in the abdominal cavity of Anopheles maculipetmis 
collected in Spain, and he reports various acarines as external para- 
sites of the Culicid^e. Leger (1902) has described a parasitic flagellate 
{Crithidia fasciculata) in the intestine of the adult female of Ano- 
pheles macidijgeimis. Herbert Johnson (1902) has described a sporozoon 
as infecting about 8 per cent of the females of Anopheles maculipennis 
collected in a certain locality- in Massachusetts in which tertian malaria 
is endemic. Martirano (1901) has described a minute trematode 
{Agamodlstomum fMartiranoi^ Stiles, 1903 [new name]) found in the 
bodx" cavity of Anopheles claviger ( = A. maculipennis) taken in Italy. 
G. IV. Mueller found an undetermined sporozoon of the genus Glugea 
in Culex. 
To these cases of parasitism I am now able to add another of con- 
siderable interest. Prof. John B. Smith, of Rutgers College, has 
« Martirano, 1901, Centralbl. f. BakterioL, Parasitenk. [etc.], Jena, xl 30 (23), 24. 
Dec., pp. 849-852, figs. 1-4. 
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