ART. 9 AMERICAN XYLOTINE SYEPHID-FLIES SHANNON 15 



and mid tarsi yellowish ; hind legs blackish except for yellowish base 

 of tibiae; second and third tergites each with a pair of yellowish 

 spots ; third and fourth tergites of equal length ; metasternum pilose 

 without spurs; wings subhyaline. 



Female. — Front very long and narrow, width at vertex distinctly 

 less than length of third antennal joint ; abdomen somewhat broader 

 and shorter than in the male. Length 12 mm. ; wing 8.5 mm. 



Originally described from Brazil. Specimens at hand: Para, 

 Brazil (H. W. Bates) ; Ega, Brazil (H. W. Bates) ; Taboga Island, 

 Panama, February 22, 1912 (A. Buscli) ; Trinidad River, March 29, 

 1912 (A. Busck) ; Cano Saddle, Gatun Lake, August, 1923 (R. C. 

 Shannon). The specimens from Panama have a somewhat different 

 appearance from that of the Brazilian specimens but this is not 

 sufficient for specific differentiation. 



Sufficient data is not at hand to determine whether S. amerioana 

 Schiner (= mexicana Bigot) is a synonym of vagans Wiedemann 

 or the species described below, schildi. 



Type. — Location unknown. 



PLANES SCHILDI, new species 



Male. — Rather small, slender species ; ocelli well advanced of occi- 

 pital margin; ocellar triangle elongate; antennal prominence mod- 

 eratey developed ; face blackish, becoming yellowish in front of oral 

 margin, entirely covered with silvery pollen; mesonotal poUinose 

 stripes fairly developed; fore and mid tibiae yellowish; fore and 

 mid tarsi, except terminal three joints, yellowish white; metasternum 

 without spurs; abdomen rather slender, tergites 2 and 3 with small 

 yellow spots; fourth tergite shorter than the third. 



Feinale. — Front very narrow, much less than length of third an- 

 tennal joint and two and one-half times longer than the arista ; front 

 and mid tibia yellowish. Length, 7.5 mm. ; wing, 6.5 mm. 



Type locality. — Higuito, San Mateo, Costa Rica (Pablo Schild.) 



Type.— Cfii. No. 28674, U.S.N.M. 



Male type, female allotype, male paratype. A very closely allied 

 species to vagans. 



Genus XYLOTOMIMA, new genus 



Type. — Xylota vecors Osten Sacken. 



Metasternum with pile approximately the length of the pile on 

 hind coxa (sparse in pigra) ; head broadly elliptical; metathoracic 

 spiracle approximately the size of second antennal joint; arista usu- 

 ally shorter than width of face; hind femur greatly enlarged; male 

 with frontal triangle almost entirelj^ shining (pollinose in baton 



