SYNOPSIS OF NORTH AMERICAN SYRPHIDJS. 251 



Hypopygiuiu shining black. Front legs black, immediate base of fem- 

 ora, knees, and base of tibife, yellow ; middle and hind femora black 

 except base and tip ; hind tibise usually with a broad blackish preapical 

 ring ; tip of middle and hind tarsi frequently blackish. Wings hyaline 

 in front, towards the base more reddish, beyond brown. 



Twenty-five specimens, mostly caught about blossoms of Cornus pern- 

 iculata in the latter part of June. New York (Professor Comstock), 

 Pennsylvania (Keen). 



In his description of T. obscura, Loew says : "AT. hoinbylanti, cui 

 simillima, facei tuberculo minuto quidem, sed manifesto differt." But, 

 unfortunately, although the facial tubercle or convexity is not incon- 

 spicuous in some specimens, in others it is absolutely wanting. From 

 this fact, and because they agree throughout with the descriptions of 

 the European specimens, I must agree with Jaennicke (I^eue Exot. 

 Dipt., p. 4) in considering the species the same. 



Temnostoma pictulum. 

 Habitat. — Pennsylvania ! 



9 . Length, 12 to 14'"'". Head black; face and front thickly clothed 

 with golden -yellow pollen, a median stripe reaching from the vertex 

 over the base of the antennae to the oral margin, and the cheeks, bare, 

 shining. Antennae wholly light yellow. Thorax black, with bright 

 golden pollinose markings as follows : A spot on the humeri, an inter- 

 rupted band on the suture, a large oval spot in front of the post- alar 

 callus, two spots of about the same size as the last in front of the scu- 

 tellum, nearly confluent, the scutellum, except the base, a spot on the 

 meso-pleurae and one on the stern o-pleurse. Abdomen golden-yellow 

 opaque ; first segment, the anterior margin of the second, and the very 

 slender front margins of the third and fourth, a cross-band on the mid- 

 dle of second segment, not reaching the margins, similar, but success- 

 ively narrower ones (almost linear on the last), on the following seg- 

 ments, black. Legs yellow ; front tibis6, except the base, and front 

 tarsi, deep black. Wings brown along the front border, sub-hyaline 

 behind. 



Two specimens, Pennsylvania (Mr. Eugene L. Keen). Is most nearly 

 allied to T. excentricum, but the scutellum is golden pollinose, not shining; 

 the spots on the thorax are larger, and there are two separated spots 

 in front of the scutellum instead of one triangular one; the median 

 black bands of the abdominal segments are not distinctly interrupted 

 in the middle, the front of the female is broader above and the insect 

 is smaller. 



Temnostoma excentrlctmi. 



Milesia excentrica Harris, Insects of New Eng., injur, to Veget. ; Osten Sacken, 



ibid, Srd ed., 609, fig. 267 (male). 

 Temnostoma excentrica Osten Sacken, Cat. Dipt., 138, 253 (male). 



Habitat. — Massachusetts, Tennessee!, Illinois (O. S.). 



