62 



MISC. PUBLICATION 631, U. S. DEPT. OF AGRICULTURE 



Thorax usually bright metallic yellow to blue green, the middorsal stripe 

 of the mesonotum not extending over the scutellum ; female usually with 



two proclinate fronto-orbitals (fig. 24) macellaria (Fabricius) 



Thorax usually metallic dark blue to black, the middorsal stripe extending 

 over the scutellum ; female with one proclinate fronto-orbital bristle 



aldrichi (Del Ponte) 

 (=laniaria Aldrich, not Wiedemann) 



Figure 21. — Dorsal view of posterior segments of third-stage larva : A, Pigmented 

 tracheal trunks of Gallitroga wmericavm; B, unpigmented tracheal trunks of 

 G. macellaria. (After Laake, Gushing, and Parish (77, p. 11).) 



Figure 22. — Cephalopharyngeal skeleton of mature third-stage larva, lateral view : 

 A, Callitroga americana; B, C. macellaria. (After Laake, Cushing, and Parish 

 (77, p. 7).) 



