ART. 10. PUP ARIA OF 100 MUSCOID FLIES— GREENE. 5 



3. Posterior spiracles far above tlie longitudinal axis line, located in a trilobed 



area (No. 2) Sturmia distincta Wiedemann. 



Posterior spiracles touching tbe longitudinal axis line ; not in a trilobed 

 area (No. 3) Phorocera meracanthae Greene. 



4. Posterior spiracles in a smootli, bare, octagonal area. 



(No. 4) Sturmia inquinata Van der Wulp 

 Posterior spiracles in a round, hairy area. 



(No. 5) Celatoria diabrotica Sbimer. 



GROUP B. 



Spiracles in a pit or cavity; spiracles below the surface of the puparium, without 



spine-like hairs. 



KEY TO THE SPECIES. 



1. Bottom of pit entirely chitinous and very rugose. 



(No. 6) Ptilodexia tibialis Desvoidy. 

 Bottom of pit not chitinous 2 



2. Puparium small; spiracles with three very small, parallel slits. 



(No. 7) Eilarella siphonina Zetterstedt. 

 Puparium small ; stigmal plates pointed towards the base ; slits long, parallel. 



(No, 8)Pachyophthalmus floridensis To\\'Usend. 

 Puparium large; spiracles rather large 3 



3. Puparium with a deep pit ; a wide angular, transverse depression below the 



pit (No. 9) Megaparia opaca Coquillett. 



Pit very shallow; no depression beneath the pit. 



(No. 10) Zelia vertebrata Say. 



GROUP C. 



Spiracular slits resembling brain coral. 



KEY TO THE SPECIES. 



1. Puparium elongated, conical ; stigmal plate with three lobes ; each lobe with 



numerous small slits (No. 11) Beskia aelops Walker. 



Puparium not elongated and conical 2 



2. Spiracular protuberances well separated at the base ; stigmal plate broadly 



elliptical ; slits wide ; button large, round, in the center of the plate. 



(No. 12) Oestrophasia ochracea Bigot. 

 Spiracular protuberances touching at the base 3 



3. Spiracular plate elongate triangular ; slits broad. 



(No. 13) Phasmophaga antennalis Townsend. 

 Spiracular plate not triangular ; slits linear and angiilar. 



(No. 14) Coquillettina plankii Walton. 



GROUP D. 

 Spiracles with serpentine slits, resembling a. snake or serpent. 



KEY TO THE SPECIES. 



1. Posterior spiracles on the dorsum of tbe puparium ; segmental lines distinct 



dorsally; large puparium (No, 15) Belvosia bifasciata Fabriciua 



Posterior spiracles not on the dorsum of the puparium 2 



2. Posterior spiracles distinctly protuberant 3 



Posterior spiracles not protuberant 7 



