AGAMOMERMIS 163 
the alimentary canal, and on one occasion, tearing the abdomen in two, he 
found that this enlargement contained two worms. These were the types of 
Stiles’s Agamomermis. In 1903, examining a large series of sollicitans, Smith 
found a considerable number of adults infested by these worms, and from that 
time on he made careful examinations of all material that came into his labora- 
tory. The result was that every collection, from the Raritan River to Cape 
May, was found to be more or less parasitized. None, however, were found on 
the Newark or Elizabeth marshes. The records made by Mr. Viereck at Cape 
May, and published in Smith’s report on the mosquitoes of New Jersey, al- 
though incomplete as omitting the month of August, are very interesting in 
showing the proportion of infestation : 
* Date. Number of specimens taken. Number parasitized. 
June 25 113 3 
July 1 148 15 
« 10 151 88 
27 137 10 
“« 31 309 112 
Sept. 13 100 50 
“14 100 39 
sie I, vad 16 
“« 18 62 2 
G5 21 100 8 
«22 100 1 
25 82 2” 
In Doctor Smith’s opinion, this roundworm is a very material check to the 
multiplication of Aédes sollicitans, for in no case where a parasitized specimen 
was examined were the ovaries developed. Several of the worms will sometimes 
occur in a single adult mosquito, completely filling the body-cavity. As abun- 
dant, however, as the parasites were they did not reduce the mosquitoes appre- 
ciably even in those localities where they were most abundant. But it must be 
remembered that any such reduction would not become apparent until a later 
generation of the mosquitoes. The life of the adult is probably shortened to 
some extent by the parasite, which does not, however, prevent migration, since 
parasitized mosquitoes were taken far inland. Neither does the presence of the 
parasites prevent the mosquitoes from feeding, for Doctor Smith killed infested 
specimens that had actually bitten him. In fact, he sat for an hour one after- 
noon at Anglesea, capturing such specimens as came to bite, and found that 
nearly or quite one-half were infested. 
Doctor Smith also records the fact that in 1902 one of his assistants, Dr. H. 
P, Johnson, found the young of an intestinal worm in an Anopheles larva. 
E. Gendre has recently found a similar larval nematode parasite, at Labé in 
French Guinea, infesting the larve of the yellow-fever mosquito (Aédes calo- 
pus). The worms were always found in pairs, one large and one small, and in- 
habited the general body-cavity of the mosquito larva, rolled up in the thorax. 
The mosquito larve, while they were growing, did not appear to suffer from the 
presence of the parasites but retained their appetite and vivacity. No injurious 
12 
