1> TUF. t ANADlAN ENTOMOLOOIPT. 



specimens that are smaller ihan those from the type locaHty (Caldwell. 

 Idaho), being about 2)j mm. long, but undoubtedly belong to this species. 

 In thrir markings they differ slightly from the type, as seen from the 

 following : First joint of antennu' yellow ; basal two-thirds of second joint 

 black, the tip yellow; third joint black, with a very narrow yellow base. In 

 one of the specimens the front, except ocellar tubercle and the face, entirely 

 yellow ; in the other there are three minute parallel dark lines running 

 from the ocellar tubercle to within a short distance of the antennx. Prof. 

 Aldrich, who furnished the type specimens, states (Psyche, loc. cit., p. 185) 

 that he collected them on a white sand bar along the Boise River at 

 Caldwell, Idaho, June 24, 1901. It is very pale in life, and flies just like 

 the drifting of the sand, close down and a short distance at a time. It is 

 a fine instance of protective coloration. The male has beautiful purple 

 eyes in life. My specimens were taken during the hottest hours of the 

 day at the flowers of Rudbcckia /lirta, in a sand pit on the southern slope 

 of one of the numerous moraines that form the characteristic feaf.ircs of 

 the topography of that region. 



Pyrophavay Schiner. — In its geographical distribution this genus is 

 restricted to thr boreal areas of Kurope (probably Kurasia) and North 

 .America, and is represented by two species only, both of which seem to 

 be of rare occurrence in both hemispheres. 



P. rouxrum, labr. — Osten Sacken referred to this species in his 

 Catalogue of N. .Vm. Diptera (1S78) as having been found in the White 

 Mts. of New Hampshire and in Massachusetts, but since that time it has 

 not been reported from any part of this continent, and Prof. NN'illislon 

 states in his .Synopsis of the N. Am. Syrphid.T: that he does not know the 

 species. A male specimen collected by the writer, June 5, 1S9S, in a 

 tamarack swamp at Klkhart Lake, Sheboygan Co., Wis., evidently belongs 

 here. It lias a U-nglh of 9 nun. The two yellow spots on the third 

 Tbdominnl segment are narrowly sep.Tralcil, rounded posteriorly, atul 

 occupy the anterior two thirds of the segment. Ir) addition to these there 

 are two faint and much smaller spots on the fourth segment that are 

 widely separated, and take up hardly the anterior third of the segment. 

 The occurrence of such spots on the fourth segment is not mentioned in 

 the original description, but otherwise the specimen agrees very closely 

 with the description. 



