SYNOPSIS OF NORTH AMERICAN SYRPHID^. 235 



Xylota Anthreas. 



Xijluta Authreas Walker, List, etc., iii, 556. 



Habitat — New Jersey (Walker), New Hampshire ! 



9. Leujith, 9™"'. Front uarrow above, sliiniag black, whitish ])olli- 

 uose in the middle and on the sides below. Antenn;T3 black, third joint 

 subquadrate, reddish brown; arista luteous at the base. Face blacky 

 whitish polinose, except on the cheeks. Thorax shining black, some- 

 what metallic; pile short, apjn'essed, light colored; hnmeri seri(;eous 

 pollinose; pleurae black, shining, lightly polliuose. Abdomen blacks 

 but little shining; first and fourth segments shining; second, third and 

 fourth segments ea3h with a large, subtriangular, shining metallic, 

 white pilose spot on each side, those of the third imrrowly separated, 

 those on the iourth confluent. Legs black, white pilose; the immedi- 

 ate til) of the femora, and the base of all the tibice, the tips of the four 

 front tibiae, and the first three joints of their tarsi, yellow; the tip of 

 the hind tibiae, and the basal joints of their tarsi, fuscous yellow. 

 Wings nearly hyaline; stigma luteous. 



One si)eciineu. New Hampshire. Differs from X elongata in the 

 shape and color of the third joint of the antennae, and in the less elon- 

 gate abdomen; from X obscura in the front of the female being nar- 

 rower above, the four front tarsi lighter yellow on the basal joints, and 

 in the base of the arista being luteous. 



Xylota metallica. 



Xyhjta mcfaUica Wiedemauu, Auss. Zw. Ins., ii, 102. 



Hahitat. — Georgia (Wied ). 



Thorace aeueo, abdomine nigro; maculis quatuor magnis quadratic 

 luteis. Mit erzgriinem Eiickenschilde und schwarzem Hinterleibe, mit 

 vier grossen viereckigeu gelben Flecken. — 3i| Liuieu. 



Fiihler ocherbraun. Untergesicht metallisch schwarz, weissschim- 

 mernd. Stirn schwarz. Eiickenschild erzgriiu, mit vier sehr schwach 

 kupferrothlichen Striemen und weissschimmernden Schultern. Brust- 

 seiten schwarzlich, mit breiter weissschimmernden Binde. Schild- 

 cheu erzgriin. Hiuterleib schwarz, zweiter und drifter Abschnitt jeder 

 an jeder Seite mit einem grossen, die Wurzel beriihrenden,zwei Drittel 

 der Lange des Abschnitteseinuehmenden, in gewisser Kichtung opalisi- 

 renden Flecke ; der schwarze Raum zwischen den Fleckenpaaren nur 

 schmal; vierter Abschnitt iiberall metallisch schwarz. Fliigel und 

 Schwinger gelblich, Eandmal lehmgelb. Beinerostgelblich, wenig weiss- 

 lich schimmernd; hinterste verdickte Schenkel schwarz, mit Rostgel- 

 ber Wurzel; Spitze dervordern Schenkel braun; hintere Schienen und 

 der Spitze aller Fiisse braun. — Wiedemann. 



Length, 7.5'""\ Antennae ochre-brown. Face metallic black, whitish 

 pollinose. Front black. Dorsum of thorax bronze-green, with very 

 feeble copjjery reddish stripes and white sericeous humeri. Pleurae 

 blackish, with a broad, white pollinose stripe. Scutellum bronze-green. 



