SOME PARASITES OF SIMULIUM LARY/E. 



localities. All these forms, however, live in the same way and 

 appear to be related to the pebrine disease of Lepidoptera. Tin- 

 body, especially near the apex of the abdomen, becomes much 

 distorted and swollen on account of its interior beinu closely 

 packed with a white wooly material which on diection is seen 

 to consist of count less "spores" of minute si/e. Such parasitized 

 larvae are usually rather smaller than healthy individuals, but 

 tin- hi-.tol.la~t- do not appear to be much affected. The para-ite 

 apparently enter-, the 1,. >dy cavity in the -ame manner as that 

 dt--cril>ed in ill'- case of Mcrmis. K\ idemv of thi- i- seen in a 

 h\ pi-rirophied condition of part- of tin- mesenteric \\all. From 

 h.-n- it seems to pass to one or both of the -exnal organs \\hich 

 .ire d'--t ro\ i-< 1 .mi 1 IM-. i niie the nuclei tor the great ma-- ot -pore-. 

 \\hich eventually fills the abdomen. The para-iti/ed larvae in 

 tin- al-o \\i-re never observed to pupate but died \\lu-n 



mature. The -pores are liberated by a rupture of the abdominal 

 \\all -oi.ii .itter the death of the host and pa-- into the \\ater. 

 after \\hicli stage ih'-y have not been -ecu. l"p to >o j.i-r cent. 

 of the laiA.e iii -oine -iream- were found to contain lar^e ma- 

 o| tin- p.ira-ite but no cases of slightly para-iti/eil lar\.e were 

 ob-er\ei|. There has been no -econd brood of Simulium larva- 

 tin- year, -M> it would seem that if the par.i-iie i- t.. ap|u-ar next 

 \ear then- must be a sccondar\- h<i>t in \\hich the -umniei i- 



ed. 



POSTSCRIPT. 



The foregoing account of the Spon./oid ]>ara-iti- o| Simulium 

 hirti(>f> \\a- \ cry kindly reviewed for me by Professor G. V 



Calkin-. ..I I "olumbia I'niversity. 1-roin mounted -|.ecimen- of 



the -p. -it him he confirmed my opinion thai ihe-e represent 



some species oi M\ \<-|)oridea, and drew my at tent ion to a paper 

 by I.oiii- I ; . \\hich 1 had o\cilo,,ked because of it- not 



beiii- catalogued under Simulium in the cards of the " Concilium 



Bibliographicum " in the C'ambrid^e librar\ . In thi- papt-r a 

 ne\\ -P.-MC- of Cilii'^fti parasitizing the lar\ae of the luin.|ean 

 Sininlinni onuitnni i- <K--i ribeil i :ritins. The note- on thi> 



-|>ecic- are in brief a- follow-: The abdominal r.-i.,n of the 

 in!\--ted lar\a i- greatl) di.-ti-ndi-il ami contain- lar^c mass< 

 a free |).ira-ite in the form of opaque. milk\' white, irregular - 



