ART. 9 AMERICAN XYLOTINE SYEPHID-FLIES SHANNON 13 



B^ Metasternum without spurs ; tergites 2 and 3 with yellow spots. 



C\ Third tergite longer than the fourth (Co.sta Rica). 



schildi, new species. 

 C^ Third tergite equal to the fourth. 



D\ Anteunal prominence strongly developed ; face decidedly re- 

 treating (Brazil) vagans (Wiedemann). 



D^ Antenual prominence less developed ; face less retreating 



(Bolivia) boliviensis, new species. 



A^ Females. 



B\ Front and mid tibiae, except the whitish base, fuscous black (Cuba). 



pachymera (Loew). 

 B^ Front and mid tibia whitish to yellow brown. 



C\ Width of front at vertex equal to length of third antenual joint 



( Bolivia ) boliviensis, new species. 



C". Width of front at vertex much less than length of third antennal 

 joint. 

 D\ Length of posterior cross vein much longer than distance be- 

 tween tips of second and third veins vagans (Wiedemann). 



D^ Posterior cross vein equal to distance between second and third 

 veins. 

 E\ Length of front two and a half times the length of arista 



(Costa Rica) schildi, new species. 



E^ Length of front less than twice the length of arista (Bo- 

 livia) minor, new species. 



PLANES PACHYMERA (Loew) 



XyJota pachymera Loew, Cent. VI, 54. 



Only the type, a female, is known. Notes based on type specimen. 



Face keeled; front rather narrov^, a broad pollinose band below 

 middle; vertex swollen; ocelli well advanced; arista as long as dis- 

 tance between ocelli and antennal base and nearly three times as 

 broad as distance across antennal base; third joint more than twice 

 as long as broad ; face pollinose ; body pile very short and pale ; fore 

 legs short, tarsi shorter than tibia ; basitarsus without spines on basal 

 ventral surfaces. Recorded from Cuba. 



Type. — In Museum of Comparative Zoology. 



PLANES PRETIOSA (Loew) 



Xylota pretiosa Loew, Wien. Ent. Monat-schr., vol. 1, p. 39. 



Only the male is known (said to be female, Williston). Ocelli 

 well in advance of occipital margin; frontal triangle shining green, 

 bordered with pollen and clothed with very fine pile; face pollinose 

 except for greenish jowds; metasternum pilose and with a pair of 

 .spur-like processes. Recorded from Cuba. 



Type. — Museum of Comparative Zoology. 



PLANES PAUXILLA (Williston) 



Xylota pauxilla Williston. Biol. Cent. Amer., D'ptera, vol. 3, p. 71, 1903. 



Notes based on the type. Face rather indistinctly carinate ; anten- 

 na rather long; metasternum of male with a pair of spurs; abdo- 



