THK MYCETOPHILID.E OF NORTH AMERICA. 



275 



Explanation of Plates. 

 Plate. (Figs. 46 to 69 reduced from Plate i in Johannsen's 



Mycetophilidse, Genera Insectorum), 

 Fig. 46. Head of Asindulum montanum. 



47. Palpus of Ceroplatus. 



48. Antenna of Ceroplatus. 



49. Proboscis of Asidulum coxale. 



50. Palpus of Exechia. 



51. Antenna of Alycetophila. 



52. Antenna of Cordyla. 



53. Head of Gnoriste. 



54. Palpus of Cordyla. 



55. Ventral aspect of mouth parts of Mycetophila 

 punctata. 



56. Mycetophila punctata, female. 



57. Tarsal claw of Mycetophila. 



58. Tarsal claw of Ceroplatus. 



59. Antenna of Diomonus. 



60. Tibia and tarsus of Heteropterna (after Skuse). 



61. Head of Hadroneura (after Lundstrom). 



62. Hind tibia of Exechia. 



63. Dorsal aspect of head of Mycomya (Sciophila Win- 

 nertz). 



64. Proboscis and palpi of Arctoneura (=Cyrtoneura, 

 after Marshall). 



65. Dorsal aspect of head of Diomonus. 



66. Antenna of Platyroptilon (after Westwood). 

 6y. Dorsal aspect of head of Exechia. 



68. Head of Lygistorrhina (after Skuse). 



69. Frontal aspect of Leia (=Neoglaphyroptera Osten- 

 Sacken). 



70. Diagram of Palaeoplatyura wing. 



71. " " Ditomyia wing. 



72. " " Sciophilinas wing. 



73. " " Mycetophilinse wing. 



Explanation of Abbreviations. — C = Costa ; Sci and Sca — 

 anterior and posterior branches of the subcosta ; Ri, R2+3, and 

 Ri-fs = branches of the radius ; Rs = radical sector = 



R=+3+R4+5; Mi+= and M3 = branches of the media; Cui and 



