6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.66 



35. Puparium with a depression, containing a central ridge above the posterior 



cavity ; iwsterior cavity small, rounded ; a weak tubercle each side of the 

 anal opening ; first slit bent toward the second, other slits nearly straight, 



of equal length No. 34, Sarcophaga utilis Aldrich. 



Puparium not as above 36 



36. Posterior cavity located on but mostly below the horizontal axis 37 



Posterior cavity located more centrally on the horizontal axis 38 



37. Spiracular plate somewhat rounded ; three long, narrow, arcuated slits of 



equal length; a small tubercle each side of anal opening; these tubercles 



close together No. 35, Sarcophaga tryoni Johnston and Teig. 



Spiracular plate not so rounded ; third slit shorter than first two ; larger 

 tubercle each side of anal opening ; these tubercles widely separated. 



No. 36, Sarcophaga dux Thomson. 



38. With large rounded tubercles each side of anal opening; slits in spiracular 



plate narrow, slightly arcuate and of nearly equal length. 



No. 37, Sarcophaga aldrichi Parker. 

 Tubercles at anal opening very small or absent 39 



39. Tubercle small 40 



Tubercles absent ; spiracular plate with an extension of chitin except on 



the inner edge; first two slits parallel; third slit slightly arcuate and 

 extending below the other silts No. 38. Sarcophaga kellyi Aldrich, 



40. Middle slit long, straight 41 



All three slits slightly arcuate ; posterior cavity elongated transversely ; 



ridges on spiracular plate broad, with a deep notch between them. 



No. 39, Ravinia peniculata Parker. 



41. Spiracular plate rounded ; tubercles and anal opening near lower edge of 



posterior cavity No. 40, Sarcophaga placida Aldrich. 



Spiracular plate more rectangular; tubercles more widely separated; more 

 distant from posterior cavity and with a slightly raised area between 

 them No. 41, Sarcophaga froggatti Taylor. 



TABLE OF SPECIES U\RVAB 



1. Anterior end pointed ; posterior end truncate ; chitinous spines small 2 



Anterior and posterior ends tapering slightly ; chitinous spines very robust. 



No. 42, Sarcophaga cistudinis Aldrich. 



2. Larva quite robust ; posterior cavity small ; a large rounded tubercle each 



side of the anal opening ; spines along segmental lines small and sparse. 



No. 43, Wohlfahrtia vigil Walker. 

 Larva more slender; posterior cavity larger 3 



3. Posterior cavity with a very large tubercle each side; anal tubercles very 



widely separated ; spiracular plates small ; chitinous edge of plate broad 



and the slits short No. 44, Sarcophaga placida Aldrich. 



Posterior cavity and characters not as above 4 



4. Anal tubercles slender ; tubercles below posterior cavity nearly in a line ; 



spiracular plates large with long slits. 



No. 45, Sarcophaga buUata Parker. 

 Anal tubercles more robust ; tubercles below posterior cavity, with a pair 

 of small ones below the usual line ; spiracular plates smaller. 



No. 46, Sarcophaga securifera Villeneuve. 



