THE CANADIAN ENTOMOLOGIST. 1-1 ,) 



spurs. It has occurred to me that possibly where Dr. Williston, in the 

 Synopsis, p. 234, says " hind coxre unarmed," he meant to state exactly 

 the reverse. The second and third abdominal segments are opaque, but 

 have obscure yellowish, shining spots ; the fourth segment is entirely 

 shining bluish-black. The thoracic dorsum and scutellum are brilliant 

 purplish-metallic. 



37. Xylota a/ia/is, Will. Synopsis N. A. Syrphids, 226. 



I possess a male specimen of this species taken on the Pine Ridge in 

 Nebraska in July. This specimen agrees exactly with a specimen from 

 San Pedro, California, Aug. 1896. This species has not been recorded 

 outside of New Mexico and California. 



38. Xylota fraiidulosa, Loew. Centur. v., 41. 



I have specimens of this species taken in North-western Nebraska. 



39. Xylota ejtmcida. Say. 



One specimen : Cook's Inlet, Alaska ; coll. L. L. Dyche. 



40. Mallota facialis, Hunter. 



This species was described from a single male specimen from Pine 

 Ridge, Nebraska. This season's collecting includes another specimen 

 from the same region that is in every way a verification of the views I 

 held at that time. 



41. Triodonta, sp. 



I have a female specimen of a species of this genus from Palo Alto, 

 California, which undoubtedly is a species distinct from cun.'ipes, Wied. 

 It is, however, so closely allied to that species that I hesitate to describe it 

 from only the female. Doubtless in the male there are abundantly 

 sufficient characters for specific separation. This specimen differs from 

 the female of T. curvipes, Wied., in having the thorax almost bare and 

 shining, not densely brownish pollinose. The abdomen is bare and 

 shining black with the narrow posterior margins of the segments yellow, 

 with only very slight indications of pollinose spots on the segments 

 laterally. It is also much smaller, 8 mm. in length. 



42. Tropidia iiio/itaiia, Hunter; Ent. News, 1896, p. 215. (Change of 



name from T. nigricornis, which is preoccupied. Sec Ent. News, 



1896, 305.) 

 Since writing the description of this species I have e.xamined a 

 female specimen of Tropidia i/icaiia, 'i'ownsend (Trans. .Vm. Ent. Soc, 

 1895, P- 53)) ^'""'^1 Colorado, as well as the type of that species in the 



