20 PROCEEDINGS OF THE NATIONAL MUSEUM vor.; 70 



Length, 16 mm.; diameter of thorax, 3.75 mm.; diameter of ab- 

 domen, 3 mm. 



Specimen bearing two labels: "Johnson, Pa., April 27, 1900. 

 Issued May 31, 1900," and " 9199. In soil." 



EXPLANATION OF PLATES 



(Reproduced from drawings by the author) 



Plate 1 



Fig. 1. — Xylomy'ta palUpes Loew, larva: (a) anterior spiracle; (6) posterior 

 spiracle. Pupa: (c) anterior thoracic spiracle; (d) abdominal 

 spiracle. 



2.- — Rhachicerus niiidus Johnson, larva: (e) anterior spiracle; (f) pos- 

 terior spiracle. 



3. — Xylopliagus liigens Loew, larva: (g) anterior spiracle; (h) posterior 

 spiracle. 



4. — Xylopliagus aMominalis Loew, larva: (0 anterior spiracle; (j) pos- 

 terior spiracle. 



5. — Atherix variegata Walker, larva: (k) ventral view of proleg. 



6. — Vermileo comstocMi Wheeler, larval head capsule. 



7. — Chrysopila, species, lai-va : (fph) frontal portion of head (left half 

 shown); (l) head enlarged ; {m) anterior spiracle; (md) mandible; 

 (n) posterior spiracle; (pi) keel-shaped plate. 



Plate 2 



Fig. 8. — Xiilophai/its ahdomhuilis Loew, pupa: (o) anterior thoracic spiracle; 



(p) abdominal spiracle. 

 9. — Xylophagus lugens Loew, pupa: (q) anterior thoracic spiracle; (?•) 



abdominal spiracle. 

 10. — RJiachicerns nitidns Johnson, pupa: (s) anterior thoracic spiracle; 



(/) abdominal spiracle. 

 11. — Vermileo comstockii Wheeler, pupa: («) anterior thoracic spiracle; 



(r) abdominal spiracle. 

 12. — Cooioiiiirft feiTiigiiwa Scopoli, pupa: (n?) anterior thoracic spiracle; 



(x) abdominal spiracle. 



Plate 3 



Fig. 13. — Leptis mystacea Macquart, pupa: (y) ventral view of head; (z) an 

 terior thoracic spiracle; (aa) abdominal spiracle. 

 14. — Chrysopila quadrata Say, (&6) anterior thoracic spiracle; (cc) ab- 

 dominal spiracle. 

 15. — Chrysopila fasciata Say, (dd) anterior thoracic spiracle; (ee) ab- 

 dominal spiracle. 

 16. — Chrysopila foeda Loew, iff) anterior thoracic spiracle; (gg) ab- 

 dominal spiracle. 

 17. — Chrysopila ornata Say, (hh) anterior thoracic spiracle; {ii) abdomi- 

 nal spiracle. 



o 



