LARVAL ANATOMY OF THE QOUT-FLY OF BARLEY, 783 



?)0. On tlie Larval Anatomy of the Gout-Fly o£ Barley 

 (Chloro/>s iceniopus Moio.) and two Related Acalyp- 

 trato Muscids, with Notes on their Winter llost-Planis. 



Vyy J. G. IT. Frew, M.Sc. (Birminohani), F.Z.S., 

 Ministry oE Aorioulturo Research Scholar. 



[From tlio Entomological Depaitnicufc, Uotliamsted Experimental Station, 

 Hurpenden]. 



[Received June 4, 1923 : Read October 23, 1923.] 



(Text-figures 1-23.) 



Table of Contents. p^^ 



Introduction 784 



Chi or ops tceiiiopus Meig. 



A. External Anatomy of Larva 784 



Jlead 785 



Hody-segments 787 



B. Internal Anatomy of Larva ; 788 



Ccplialo-pliaryngeal skeleton 788 



Traclieal system 701 



Alimentary canal and its appendages 700 



Central nervous system — Cephalic imaginal discs and related 



parts 798 



Other imaginal discs 801 



The dorsal vessel, nephrocytes, etc 8o5 



(Enocytea 806 



Fat body 800 



Integument 800 



Gonadial rudiments 807 



C. Other Immature Stages of Chlorops 807 



The puparium 807 



The iirst larval instar 808 



'J'lio second larval instar 80!) 



The egg 809 



Meromi/za nigriventris Mcq. 



The mature larva 810 



The head 810 



Thoracic segments 811 



Abdominal segments 811 



Ccphalo-pharyngeal skeleton 812 



Tracheal system , 812 



Puparium 813 



JSalioptera comhinata L. 



The mature larva , 814 



The head 814 



Thoracic segments 815 



Abdominal segments 815 



Ccphalo-pharyngeal skeleton « 816 



Tracheal system 817 



Puparium 818 



CJiloropisca glabra Me\g 819 



Winter Hosts of Species considered 819 



Summary 820 



Reference Lettering of Text-figures 820 



List of Literature , 820 



