U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 69. ART. 10 PLATE I 



tt»\tk terq'ite 



clamper 



xui«\\n\culuvn 



-side piece 







Pros,\n.aUur>v hW tipeS Tries TK.rt.pes, ge.itoi.^ oj ^Z^!'' *'*^'"""' 





S>. ven,\l.&tum;Vcntro.\ vie-w eS^ 3 ^en'talio- 



S. vena&tinn, ccLu-olal view o^ 

 vnale gemtaJiOL 



O..QeA'ita.V ^orK 

 b.termiy\a.\ organs 



Two-WiNGED Flies of the Family simuliidae 



For explanation of plate see page 48 



