io6 OHIO BIOI.OGICAL SURVEY 



EXPLANATION OF PLATE IIL 



Figures 21-30 Paragus bicolor (Fab.) 



Fig. 21 Mature larva x 10; a, antennae; b, anterior spiracle; c, posterior respiratory 

 organ. 



A segmental spine of the larva x 40. 



Antero-lateral view of mouth-parts of larva, much enlarged; a, outer pair of 

 moulh-hooks; b. broad chitinous plates surrounding the esophagus; c, 

 antennae; d, upper jaw; e, three pairs of lateral mouth-hooks; f, lower jaw. 

 Right anterior spiracle highly magnified. 



Dorsal view of posterior respiratory organ x 60; a, the dorsal spine; b, one 

 of the radiating spiracles. 



Fig. 26 End view of posterior respiratory organ x 70; a, its dorsal spine; b, a spira- 

 cle; c, the circular plate. 



Fig. 27 Dorsal view of puparium x 5; a, posterior respiratory organ; b, median seg- 

 mental spine of sixth larval segment; c, dorsal and d, dorso-lateral spines 

 of sixth and seventh larval segments, respectively. 



Fig. 28 Lateral view of puparium X 5; a, posterior respiratory organ; b, median 

 spine; d, dorso-lateral spine; e, lateral spine; f, posterior ventro-lateral; and 

 g, anterior ventro-lateral. 



Fig. 29 Adult male about seven times natural size. 



Fig. 30 Front view of head of female x 12. 



Figures 31-38 Paragus tibialis Fallen. 



FJo-. 31 Posterior part of a young larva from the side greatly enlarged. 



Fig. 32 Segmental spine of a full grown larva x 40. 



F'K- 33 Dorsal view of posterior respiratory organ of larva x 60; a, the dorsal spine; 

 b, one of the paired radiating spiracles. 



Fig. 34 End view of posterior respiratory organ x 60; a, its dorsal spine; b, a spira- 

 cle; c, the circular plate. 



Lateral view of puparium x 5; a, posterior resj'iratory organ. 

 Puparium which has been parasitized by hymenopteron, Bassns ladatorius 

 showing typical form and the irregular hole thru which the parasite has 

 escaped. 



Outline drawing of adult male from the side x 8. 

 Head of female x 12. 



