OCCURRENCE OF HAUlloXEMA 



183 



11 tor 



One hundred and thirty-seven flies were examined by liim 

 the presence of Hahronema; 39 of these, or 28 per cent, were 

 found to bo infested. While Carter fouiid as many as 20 hirval 

 nematodes in a single tiy, Ransom never found more than 8. Out 

 of 43 flies of which a record was 

 kept 25 had but one parasite, 6 had 

 2 parasites, 6 had 3 parasites, 3 had 



4 parasites, 2 had 5 parasites, and 

 1 had 8 parasites. 



A record was kept of the location 

 of the parasites in the case of 37 

 flies. In 17 cases the head was in- 

 fested, in 8 cases the thorax, and in 

 19 cases the abdomen. In 12 cases 

 the head only was infested, in 4 cases 

 the thorax only, and in 15 cases the 

 abdomen only. In one case 6 larvae 

 were found in the head ; the largest 

 number found in the abdomen was 



5 (in one case). Encysted larvae 

 were found in the abdomen in 6 

 flies, in 5 of which no worms were 

 present in either the head or thorax. 

 All of the flies in which encysted 

 larvae were found had recently 

 emerged. 



One hundred and thirty-seven 

 pupae were examined and a record 

 kept and larvae of Hahronema were 

 found in 23, that is in 17 per cent. 

 The author points out that some of 

 the younger stages of the parasites 

 may have escaped detection. En- 

 cysted worms were found in 11 out 

 of 23 pupae. The location of the t. r,o rr , ,^ , 



, . t IG. 78. Hahronema>nU!icae[C&vteic). 



larvae m the pupae was as follows : Full grown larva, x 85. g.a. 



abdomen infested nine times, head Genito-anal aperture. 



.1 ^ 1 fii CauAh] end oi Habroneinaimiscae. 



once, thorax once. Only one nema- x 360. 



