112 OHIO BIOLOGICAL SURVEY 



EXPLANATION OF PLATE VL 



Figures 81-87 Syrphiis -xanthostoma Wills. 



Fig. 81 Antero-ventral view of head of larva much enlarged; a, sensory papillae; 

 b, antennae; c, upper jaw; d, outer pair of mouth-hooks; e, lateral mouth- 

 hooklets; f, lower jaw; g, anterior spiracles or larval respiratory cornua; 

 h, esophageal framework. 



Fig. 82 Lateral view of larva x 6; a, median segmental spines; b, posterior respir- 

 atory appendage. 



Fig. 83 End view of anterior spiracle highly magnified. 



Fig. 84 Dorsal view of posterior respiratory organ x 40; a, one of three pairs of slit- 

 like spiracles; b, one of the inter-spiracular spurs; c, the median dorsal spi- 

 racularspur; d, the circular plate. 



Fig. 85 End view of posterior respiratory organ, x 50; lettering as in Fig. 84. 



Fig. 86 Dorsal view of puparium x 3; a, posterior respiratory appendage. 



P^ig. 87 Lateral view of puparium X 3 



Figures 91-95 The Cock"s-Comb-Gall Ss^rphus Fly. 



Fig. 91 Ventral view of head of larva, much enlarged; a, outer pair of mouth-hooks 

 b, upper jaw; c, antennae; d, lateral moulh-hooklets; e, anterior spiracles 

 or larval respirator}- cornua; f, esophageal framework; g, lower jaw. 



Fig. 92 End view of anterior spiracle, highly magnified. 



Fig. 93 Side view of larval respiratory cornua, nmch magnified. 



Fig. 94 End view of posterior respiratory appendage x 40; a, one of the spiracles; 

 b, circular plate; c, one of the inter spiracular hairs. 



Fig- 95 The posterior end of the larva from above x 6; a, the posterior respiratory 

 appendage. 



Figures 101-103 Platychirus quadratits (Sa3^) 

 Fig. loi Puparium from the side x 4. 

 Fig. 102 Posterior respiratory appendage as it appears in the pupal stage, end view; 



a, spiracle; b, circular plate; c, inter-spiracular spur. 

 Fig. 103 Postero-dorsal view of the posterior respiratory appendage. Lettering as 



in Fig. 102. 



Figures 111-115 Chalcomyia aerea (Loew.) 



Fig. Ill Lateral view of puparium x 4; a, anterior larval respiratory cornua; b, 

 pupal respiratory cornua; c, posterior respiratory appendage; d, the anal 

 flabellae; e, one of the seven pairs of pro-legs. 



Fig. 112 End view of anterior larval respiratory appendage much enlarged. 



Fig. 113 Side view of the same. 



Fig. 114 Pupal respiratory cornua from the side much enlarged. 



Fig. 115 Two of the numerous tubercles (spiracles) of the pupal cornua highly 

 magnified. 



Figures 121, 122, Syrphus sp. 



Fig. 121 Lateral view of puparium x 2.5. 



Fig. 122 Dorsal view of puparium x 2 5. 



Fig. 17 Sculpturing on egg shell of Didea fasciata fuscipes . 



