20 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60. 



oblique angle to the puparium from a lateral view. Each stigmal 

 plate has three slits, each on top of a well-defined ridge. Button 

 large, round. Spiracles located on longitudinal axis. Anal open- 

 ing small, located just below the protuberance. 

 Length, 5 mm. ; diameter, 2 mm. 



38. ACTIA PILIPENNIS Fallen (Gymnophthalma pilipennis Fallen). 



Small ; shining, yellowish red ; posterior end with a large tubercle. 

 Spiracles shining, dark red, with a blackish tinge, especially around 

 the base ; plates touching ; located on the large tubercle. Each plate 

 has three slits, each located on top of a broad, well-defined ridge. 

 Button large, round, not distinctly defined. Spiracles located 

 slightly below the longitudinal axis. Anal opening small, just be- 

 low the spiracles. 



Length, 4 mm. ; diameter, 1.75 mm. 



39. SIPHONA GENICULATA De Geer (Croeuta illinoisensis Townsend). 



Very small ; dull, very dark red ; posterior end narrowed down to a 

 large tubercle, with the apex bilobed. Upon each lobe is located the 

 spiracle or stigmal plate, which is black and subshining. These 

 plates are separated by a distance equal to the length of one plate. 

 Each plate has three small, yellowish slits. Button small, not very 

 distinct. Spiracles located on longitudinal axis. Anal opening 

 small, located at the base of the large tubercle. 



Length, 4 mm.; diameter, 1.75 mm. 



40. SIPHONA PLUSIAE Coquillett (Siphonopsis plusiae Coquillett). 



Very small; dull, dark red; posterior end narrowed down to a 

 large tubercle, upon which the spiracles are located. Spiracles small, 

 dull black, slightly raised above the surface, widely separated, the 

 space between equal to width of one plate. Each plate has three 

 yellowish slits, nearly straight. Button large, not very well marked. 

 Spiracles located on longitudinal axis. Anal opening small and far 

 below the stigmal plates. 



Length, 3.5 mm.; diameter, 1.5 mm. 



41. PANZERIA PENITALIS Coquillett (Pyraustomyia penitalis Coquillett). 



Medium size; elongate, subshining, yellowish red; bottom surface 

 with a broad indentation; posterior end rather sharply tuberculate. 

 Spiracles small, shining black, separated by a distance about equal to 

 the width of one plate. Each plate has three slits, each located on a 

 rather broad, flat ridge. Button large, round, well defined. Spiracles 

 located on top of tubercle, Avhich is mostly above the longitudinal 

 axis. Anal opening small, located just below the tubercle. 



Length, 7 mm.; diameter, 2 mm. 



