Larvii tCr. ()y' M}coto!>ia, Ditomyia, and Syiiiinoru.i. Jii 



I V. — Oil (he fUructure of the Larvee aiid tin; Systematic 

 Position of the (lenera M ycctobia, M(J.., Ditomyia, It'inn., 

 anil SymiiuTus, ll'alh. ( Diptera Neinatoceni). My 1). 

 Kkii.in, D.JSr. (from tlie Unick Liiburalory, Uiiivcisity 

 of ('.iiiil)ri(lgt'). 



[riiUeslI.-V.] 



I. Mijcetobin iiallipes, Mcigeii. 



'i'lic larx;r of Mijci'tnhia i>(tllipi-s were Hrst (k'srrihed and 

 li iircd by Lyoimcc <^l832j aiul (lueriu-.Mi'n- vilK- (18.'jr>). 



Diifotir (IHII) au 1 iiotaljly IV-rris (1870), alter a more 

 complete study of these larvie, showed that their respiratory 

 system is arapliijjiieustic and ealkd attention to their external 

 rescmblanee ti) the larvae of lihj/phns fenesiralis, Scop. 



Osten-Sacken ( 1S'J2), referriiij^ to the papers of these 

 (Mit()iiiol();jtiNts, ajj:;iiti raised the (inestioii of the hiival reseiii- 

 blaiiee ot Mijcelohia and Rhi/phus, whieh in tlie adnlt stage 

 seemed to be so different. Bnt sinee Osten-Saekeu the 

 majority of entomologists dealing with Mycetobia un- 

 i|nestioningly referred this genus to the family Myceto- 

 phiiidie, passing over in silence the peculiar structure of its 

 larvie. Those who gave the matter any attention either 

 doubted the correctness of the original observations of Dufour 

 and Perris, or did not admit the value of larval characters 

 in determining the systematic position of Insects. 



However, a study of the life-hi>tory and larval morphology 

 of Myci'totiia jmUijies, Mg., and Rhyphiis feiivstralis, which I 

 c.irrieil out in 1'J12-13 on material collected at Chaville 

 (near I'aris) has led me to the conclusion that the resem- 

 blance between these larvsc and their ditl'erence from those 

 of Mycetophilidie is much deeper than was ever supposed. 



In the present pa[)er 1 will point out only the main 

 characters common to the early stages of Mycetoliiu pallipes 

 and Rhi/phus Jencstralts, but not found in those of 

 Mycitophilidie. 



A more detailed study cd the larval anatomy of Mycetuhin 

 I i)ropose to reserve for a special paper dealing with the 

 iamily Rhyphidx. 



CliamctiTs common to Mi/reti>hiit Cliftrnetcrs rommon to all tlie 



paltipct (IM. II. ti}r. '_'," IM. V. M vcfl(.|.ljiliii:i- (I'l- •••■) excfj-t 



ligfi. .'10, 37, '6i^) aiul lUnjiihus the ^^tiitrii JJifutni/ia nucl -Si^m- 



fenvstralii (PI. II. tig. 1). inerus. 



1. The egjrs nre iiivt'sti-d with ft I. Kgjjs nio moro or lesa scntteicj 

 gelatinous ma^swhiih in lixtd on Uu* surface of the fungus 



to a solid bubbtrntum. or rotten wood. 



'2. I'^ggs are pear-^hapt-'d. -. I'^j:g» nro elongated or sub- 



Bidiurical. 



Ann. (f- Muj. X. Hist. Str. 'J. ]\>l. iii. :j 



