ART. 9 AMERICAN XYLOTINE SYRPHID-FLIES SHANNON 49 



constricted, four times as long as its narrowest width; brownish on 

 the constricted portion, opaque bhick on the expanded posterior 

 portion. 



Feinale. — Front at vertex narrower than length of third antennal 

 joint ; at base of antennae it is equal to length of an antenna. Length, 

 15 mm. ; wing, 11.5 mm. 



Type locality. — Ega, Brazil (H. W. Bates). 



Described from two specimens, male type, female allotype, both 

 in British Museum Natural History. 



" Xylota " coarctata Wiedemann, congeneric with batesi, differs as 

 follows: Mouth margin whitish, humeri yellow; petiole of second 

 segment bright yellow ; legs black ; inner half of wings yellowish. 



Williston "^ recognized that Xylota coarctata Wiedemann on the 

 basis of the keeled face and petiolate abdomen, should be placed in 

 some other genus. The species bear a very marked resemblance to 

 certain tropical American wasps of the genera Polyhia and Tatua. 



T. hatesi has been named for H. W. Bates, the famous early natu- 

 ralist of the Amazon. 



Genus ERIOPHORA Philippi 



This genus was erected for a curious species of Chilean Syrphidae, 

 but was later made a synonym of Criorrhina by Williston.^ The 

 writer finds that although it possesses certain characteristics which 

 tend to ally it to Criorrhina, there are other peculiarities which well 

 warrant keeping it as a distinct genus. The venation shows a 

 marked difference from that of the genotype of Cnorrhina, asilica. 

 The apical cross vein has an unusually broad basal angle in Erio- 

 phora while in Criorrhina the apical cross vein is in alignment with 

 the posterior cross vein. In asilica, the posterior cross vein is twice 

 the length of the section of the fourth vein above it, while in Erio- 

 phora the posterior cross vein is only one-half the length of this 

 section of the fourth vein. The antennae also show a marked differ- 

 ence between the two. In asilica the two basal joints are each much 

 longer than broad and the arista is placed on the upper outer corner 

 of the third joint. In Eriophora the basal joints are as broad as 

 long and the arista is of the basal type, also the scutellum is nearly 

 twice as broad as long, and truncate on posterior margin. 



ERIOPHORA AUREORUFA Philippi 



Only one species is known for this genus, which is entirely bright 

 orange in color, clothed with dense, stiff pile except for the black 



' Trans. Amer. Ent. Soc, vol. 13, 1886, p. 321. 

 sidem, p. 322. 



