Mvocloliirt, I)iloinvi:i, <t»if/ SymiiuMUs. 



3.'* 



1.1. Iti-s|tirati>ry avnteiii in niu|)lii- 

 ])ii)>ii'<tu- with only twu |i,iirt 

 of tiini;li>*iia! Mpiraclfs: (1) 

 )>n)tlionicic aud ('2) pusluUli*- 



IllilUtl. 



14. Aliiiifiitiiry diK-t without niito- 



lior cu'C I. 

 l'>. .\niu VfUtml. 

 1<». SuUvary ^iuiids .^liort. 



17. lIy|M)Jcriii of p()st»'rii)r se^r- 



int'iit« of liirvju, wliu'li siir- 

 roiiiuU the aiml clt-ft, in 

 cuiuposed of VLTV lui-jjo and 

 tliiok ct'lld. 



18. I'lipie »tioiij.'ly clutinised with 



rows of siiiali lijoks ou tlm 

 Alxlxiiiiiial ."t'^riiieuts and 

 e»jte> ially on the pofterior 

 end of their bod v. 



l.'l. IJespir.itory sy*!"'!!! is oithor 

 lu'iiiipncu>tii! (li^. ."5) with ouo 

 pair of pnitlior.u'ic and sc\tMi 

 pair-t of iibdoininal Hpiriu-le'*, 

 or propiionr.iic (I'oli/lepla or 

 Diiidttciilia), or upuciislic 



(('f»'>'jtl(ltlU}. 



1 I. .Minifiitary duct with n pair 

 of aiilTior Iat4Tiil ctuca. 



\'t. \\n\i t'-rniiual or 8iibtenninal. 



I<). Siilivury ghiudr* very h>M^'. 



17. Nil spt'fiat iarjjre cells in hypo- 

 derui of the podlerior eud ot 

 tile body. 



18. I'upic with thiu cliitin aud 

 witiioul the rows of >liort 

 spines or hooks. 



All these characters show us clearly that the differcuce 

 hctweeii the larva of Mycetubia and those ot" Mycctopliilula; 

 (s. 1.) is as striking as its reseiubhince to ilic larvie of 

 K!iy|)lii(he. 



I5ui to solve finally this question a comparative study of 

 the adult stages of these Diptera had to be undi-rtaken, and 

 this was done by F. \V, Elwards (101(5, [). 11j), who in his 

 interesting paper ''On the Systeinatie Position of the 

 (lenns Mijcctobluj Mg./* arriveil at the following eon- 

 i Insioii : — 



'* Mycitob'ta agre( s with the Illiyphidie and diverges from 

 the .MyeetophiluUe in the possession of a large gnlar plate, 

 in the strnettire of the second [jalpal joint, in tne position 

 of the forking of the ladial vein, the course of the cubital 

 vein, and in the ehitinous s[)erniaiheete of the fenuilc. 

 Since the venation of Mi/cttobi(( has been shown to be 

 diitetly derivable from that of the llhyphid genus Vlbiu- 

 </astcr, it is probable that any leseniblanees in this respct-t 

 to the Mycetophilidic are due to conver-icnt evolution, and 

 not to relationship. The genus Mi/celobia (and witii it 

 Mesucbrift, thongh not Dituinyia or ^ymincriis) must tliiMC- 

 fore, on gronnds of adult as well as larval striutnre, bo 

 transferred Ironi the Mycetophilidai to the llliypbuhe.*' 



II. Dituinyia fusciuta, Meig. 



The first indication of the Indiitat of this species we owe 



3* 



