174 BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 1. NO. 3. 
50. Mallota posticata, Fabr. Not frequent. Captured in May 
and June (on flowers of Unifolinm Canadense (Desf.) 
Greene. ) 
Occurs in the Atlantic States from Canada to Penn- 
sylvania, and has also been recorded from Indiana. 
51. Mallota cimbiciformis, Fallen. Not frequent. From June 
(on flowers of Vagncra stellata, (L.) Morong.) to July 
(on flowers of Cicnta inacidata, L.) 
Previously recorded from the Atlantic States (Can- 
ada to Georgia) and besides from Ohio, Illinois and 
Nebraska. 
52. Triodonta curvipes, Wied. Rare. 7 specimens of this 
beautiful fly taken in July on the flowers of Cardmis 
arvensis, (L.) Robs. 
Has been reported for New England, Mexico, Col- 
orado and California. 
53. Tropidia quadrata. Say. A common species from May (on 
flowers of Vagnera stellata, (L.) Morong.) to August 
(on flowers of Gerardia tennifolia, Vahl.) 
Has been recorded from the New England States, 
Canada and Nova Scotia in the East and Ohio, Illinois 
and Washington in the West. 
54. Criorhina (Cynorhina) analis, Macq. Rare. 4 and i 
taken in May and June. None of these specimens were 
observed on flowers. 
Reported for the Eastern States. 
55. Criorhina (Somula) decora, INIacq. Very rare. i d 
specimen obtained in June. 
Previously recorded from the Eastern and Middle 
States, as also from Illinois. 
56. Crioprora cyanogaster, Loew. Rare. This is an early fly- 
ing species. I have captured i d and 2 9 specimens 
in April (on catkins of Salix diseolor, Miihl.) and May 
(on flowers of Solidago serotina, Ait.) 
Reported for Pennsylvania and Colorado. 
57. Xylota ejuncida. Say. Not frequent. From May to July 
(on flowers of Solidago serotina, Ait.) 
Occurs throughout the United States, from the 
Atlantic to the Pacific coast and from Canada to Alaska. 
58. Xylota fraudulosa, Loew. Rarer than the preceding. 3 ^ 
specimens taken in July. 
