142 CONNECTKLT GEOL. AND NAT. HIST. SURVEV [Bllll. 



FIGURE 4. Head Capsules, Sections of ]Mouth Parts, Etc. 



A. Glyph id ops flosus ( Neriidae ) . 



J>. nhingm nasica (Syrphidae). 



C. Gydopoda syhcsl (Nycteribiidae). cross section of 

 proboscis, after Joblinji". 



1). (ruoi-iste (Mycetophilidae). 



E. Musca doniestica, lateral view of proboscis. 



F. Section of muscid iiioiith ]:)arts. 



G. Section of mouth })arts (labium omitted) of female 



tabanid. 



H. Liinohla [Genmoniii'm) rtifit^c<ni< (Tipulidae). 



I. Bifid loops of the pseudotracheae of a fly. 



fl. Miisca domestica. 



K. Section of pseudotracheae of hoiisefiy, after Hewitt. 



L. Section of mouth parts of female mosquito. 



