FURTHER OBSERVATIONS ON THE PARASITES 
OF SIMULIUM LARVAE! 
E. HAROLD STRICKLAND 
Carnegie Scholar in Economic Entomology 
SIX PLATES 
CONTENTS 
JWR POC EET EE, «gh Cees Slate Se teee Oot Ne I? be oe Le es ye | 43 
Notes on Simulium larvae in the vicinity of Boston...................... 44 
Description of larva and pupa of S. bracteatum Coq.. ee 45 
Structural peculiarities and habits of Simulium ae ae be! aring on ein: 
Ss) DP, LL TEEN RS ag ee a ne 47 
Gmoconalictans and mode of feeding... 6.) e. ee i dee Pe 48 
DEB eaMerignophic memprAME A.) j.eia:diase sels ee eee 2 tc bode 49 
c. The relation between these structures and parasitism............ 54 
Pia OL VAC SPOLOZOAA:,. «5 te -/s sensi o 2 bok aivats vind s Sans tee gowns e 55 
(ey picaeitterey.cle: ota Mircrosportidian.. 4... 2222.26 eeee ase bec e eee: 56 
isssimeapon of the Microsporidia: ..... 05.5 ee eee eee ee A a 60 
General host relationships of the Microsporidia........................... 62 
Mater mmeamraetacthods Of StUGYs... 6.....4:, un «ee oes ad wells be de ee ces 63 
The Microsporidian and other parasites of Simulium larvae............... 64 
CSS. | DL GUSTER EOIN) BI 60) ape i See a 66 
Pega ER TELS ae STUNI Ns oan coe oc fie dos ces PAS rors hi hevca i so elbigs a2. 2 See 71 
(Gilentrees), Tae ts y oKONEh ch oyy Lak ON ieee cucu aichaerds PAE Cas att siiees cule iret Ae a 75 
Notes on the generic position of the species deseribed.................. TAC 
(ere mE AEROS TATECUION. ...acl fueron ots dake eae ee cas ss ces 7 
Uieremencnaithe parasite on the hogt..2..0..020.<ei ssc dal ee 81 
AEGhecaninewmarasiteoL orm uliine Latvia... ov4.esen estas ces sos aa oun eee 84 
Theeconomie value of parasites of Simuludac......2.0.. 02... 6.064 Pe 86 
SUG AG sass So GEM MAde a ae BOLE Eg ae SBF Sieh e ric he SA i eee fd 6 89 
ea Pentre RETRO ON sk 2 Tin EA Ma AGA eee IAS oi 5 x aay SRO 92 
INTRODUCTION 
The following paper is based upon observations of the para- 
sites of Simulium larvae during the fall of 1911, in the neighbor- 
hood of Boston. Although, prior to the spring of 1911, when 
I found several distinct parasites in these larvae, there were no 
1 Contributions from the Entomological Laboratory of the Bussey Institution, 
Harvard University, No. 56. 
43 
