NOTES. 247 



as for instance S. delineates Macq., but, of course, it is impossible to 

 judge from descriptions alone." (Reproduced from tbe Bull. Buff. Soc. 

 N. H. 1876.) Since writing the above, I bave discovered Allonrapta 

 fracta, n. sp. in California, which also shows the generic characters, as 

 defined above. Syrphus exoticns Wied., Auss. Zw. II, 136, is likewise 

 an Allograpta. 



215. Xanthogramma felix 0. Sacken $. (Bull. Buff. Soc. 1. c.) 

 Female. Face and cheeks yellow (in all my specimens, except 



one, the face has the brownish -red tinge, which the faces of Syrphi 

 sometimes assume); vertex dark metallic green, emitting a stripe of 

 the same color, which reaches the base of the antennae, where it 

 expands little; between this stripe and the eyes, the front is yellow. 

 Antennae black, sometimes faintly reddish on the under side, near the 

 suture of the second and third joints; third joint rather large, oval, 

 blunt. Thoracic dorsum of a rather bright metallic green; on each side 

 a yellow stripe runs from the humerus to the callosity near the scutel; 

 the latter yellow, its extreme base and corners blackish or brown. 

 Pleurae with a large, ill -defined yellow spot below the wings. First 

 abdominal segment with a yellow spot each side (just under the hal- 

 teres); the first cross-band (on the second segment) is either interrupted 

 by a very narrow black line in the middle, or entire; the second baud 

 is coarctate in the middle, its hind margin being a shallow obtuse angle; 

 the same may be said of the third band, except that the obtuse angle 

 is deeper and often has a notch in the middle , which sometimes cuts 

 the baud in two ; there is a narrow fourth band at the base of the 

 fifth segment, encroaching upon the hind margin of the preceding seg- 

 ment; the filth segment has a narrow yellow posterior margin. Legs 

 yellow, hind legs black or brown, except the base of the femora and a 

 space on both sides of the knees. AVings with a distinct brownish tinge 

 on their distal half, anteriorly; stigma brownish; sometimes the whole 

 wing has a brownish-yellow tinge. Length: 9^ 10'/ 2 mm 



Habitat, Westpoint, N. Y. , in Sept. 8 10, three females; Illinois; 

 Pennsylvania. (The specimen from the latter locality is smaller, wings 

 more hyaline, legs and antennae of a paler color.) The first and third 

 band are as often interrupted as not; the second often shows a vestige 

 of an interruption in the shape of an indistinct blackish line in the 

 middle. 



216. Ocyptamus Amissas Walker. In my List of N. A. Syrphidae, 

 I took this for a synonym of 0. fuscipemtis. Since then I saw that 

 Dr. Loew, in his N. A. collection, considered it a different species, and 

 he may be right. 



0. Radaca Walker, which I have seen in the Brit. Mus. is perhaps 

 a synonym of 0. Amissas or of conformis Loew; the posterior part of 

 the wing is hyaline, traversed by a brown cross-band. 



217. Brachyopa vacua 0. Sacken $. (Bull. Buff. Soc. 1. c.) 

 Brownish gray , thorax with three brown stripes ; abdomen brown, 



its basal third whitish yellow, with a brown line in the middle; arista 

 bare. Length: 89 mm. 



