SYNOPSIS OF NORTH AMERICAN SYRPHID^E. 231 



This species is' very similar to X. ejuncida. The arisia, liowever, is 

 reddish at the base, the abdominal spots are more quadrate in shape, 

 and more yellow; the legs are blacker, and the hind femora rnuoh 

 more swollen, and the coxai nvithont tubercle. Accofdiuf^ to Loew (L 

 c.) "it is similar to X Mfasciata Meig. [X. nemorum] of Europe, but is 

 a little smaller, the pile shorter, and the arista of the antennae is not 

 wholly black, but luteous at the base." 



Xylota nemorum. 



ililesia nemorum Vahr\ch\s, Sj^st. Antl., 192, 17. 



Milesia igiiara Fallen, Syrph., 11, 6. 



Xylota nemorum Meigen, Syst. Beschi-., iii, 219, 11 ; Macquart, Hist. Nat. Dipt., 

 i, 521, 3; Zetterstedt, Ins. Lapp., 585, 3; Dipt. Scand., ii, 871,3; Schiner, 

 Fauna Austr., i, 356 ; v. d. Wulp, Tijdschr. Aoor. Ent. xxvi, Amerik. Dipt., 

 3, 8, 45, 



Xylota bifasciaia Meigen, Syst. Besclir., iii, 219, 10. 



Xylota nigrijoes Zetterstedt, Ins. Lapp., 585, 4 ; Dipt. Scand., ii, 880, 14. 



Hahitai. — Europe (auct.), Canada (v. d. Wul])). 



This species is given on the authority of Mr. v. d. Wulp (1. c), who 

 in a letter to the writer says, " X. nemorum F. differs from X.fraudulosa 

 Loew not only in the size, the longer pile, and the arista not being yel- 

 low at the base, but also in totally lacking the cupreous stripes of the 

 thorax, which are present in X. fraudulosa. I believe the species are 

 distinct.-' Length, S.S™'". 



Xylota angustiventris. (Plate XI, iig. 9.) 



Xylota anyiivtlvcntrif; Loew, Centnr., vi, 58. 



Habitat. — Illinois (O. S.), I^ew York, Pennsylvania! 



S , 9 . Length, 10 to IP"". Frontal process very prominent, the face 

 much receding, thickly covered with white pollen. The frontal triangle 

 jwllinose like the face, except a bare shining spot above the base of the 

 antenniB. Antenucie brownish black, the third joint large, oblong 

 ovate; the arista black. Thorax shining, somewhat metallic green- 

 ish or bluish black ; a sericeous spot on the inner side of each humerus; 

 j)ile of mesopleurse white. Abdomen long and slender, shining metallic 

 blackish green or blue; the second segment with a slender median 

 stripe and posterior part, dilated in the middle, aM the posterior half 

 of the third segment, opaque black ; second segment with two oblong, 

 narrowly separated, yellow or luteous si)ots in the male; in the lemale 

 wanting. Legs black; base of all the tibiae, tip of front and middle 

 tibiae, first three joints of front and middle tarsi, and second and 

 third joints of hind tarsi, whitish yellow; hind metatarsi brown or 

 blackish ; hind femora moderately swollen ; hind coxae in the male with 

 a tubercle below ; hind tibiae not produced into a spur at tip, but ob 

 tuse. Wings, except the basal third, slightly infuscated, anterior cross- 

 vein very oblique. 



Two males (Auxer, Keen), and a female of which the head is wanting. 



