106 



PAPERS OX CEREAL AXD FORAGE IXSECTS. 



DESCRIPTION. 



THE LARVA. 



(Fig. 41.) 



Fig. 41. — Thelegume pod maggot (Pegomya planipalpis) . Larva: a. Side view; 6, oblique aspect of head; c, 

 thoracic spiracle; d, e, pharyngeal hooks, lateral and dorsal aspect; /, dorsal aspect of caudal segment: 

 g. anal spiracle, a, Much enlarged; b-g, highly magnified. (Orifinal.) * 



Larva cream-white, 7.9 mm. in length and 1.9 mm. in diameter. Broadly blunt 

 posteriorly, conically tapering to anterior end. Hook jaws black. At base of second 

 thoracic segment a pair of fan-shaped thoracic spiracles which are 

 pale yellow and ten-lobed. Anal spiracles on rather long papilli- 

 form tubercles; spiracular orifices of each spiracle three in number 

 and arranged to form a letter T, the stem directed laterad and 

 slightly ventrad. Four small tubercles below the spiracles are ar- 

 ranged in a row across the end of the caudal segment, the outer 

 pair the larger. In front and to the side of this row is a pair, of 

 larger tubercles and in front of this pair is a ring of twelve tubercles 

 around the segment; the two dorso-lateral and the two ventro-lateral 

 tubercles large and conspicuous, the others smaller. Ventral swell- 

 ings on segments 3 to 9, inclusive, armed with many small spinous 

 papillae. 



THE PLTARILM. 



(Fig. 42.) 



Puparium ferruginous, dark brown at ends, 

 finely wrinkled. Hook- jaws of larva visible. 



Fig. 4 2. — The 

 legume pod mag- 

 got: Puparium. 

 Much enlarged. 



n v a '• ii i (Original.) 



I ylmdrically oval, 



Length 6.4 mm.; width 2.3 mm. 



