98 



brown, with a yellow band on the fore border. — Length of the 

 body 3^ lines. — 'Albany River, Hudson Bay." The small size 

 (7 mm.) is unusual for species of this genus. A male specimen, 

 from Penobscot County (Section 2, Range 7), Maine, August 2, 

 1910 (Dr. J. A. Cushman), measuring 8 mm. in length agrees with 

 Walker's description. The scutellum has a dark band across the 

 middle, leaving a narrow basal and apical margin of yellow, the 

 basal half of all of the femora is black, the length of the first and 

 second joints of the antennae is about equal, while the length of 

 the third equals the first and second together. Coming from the 

 Canadian life-zone I have little doubt but that this is the true 

 Chrysotoxum derivatum. A female (8 mm.) from Sherborn, 

 Massachusetts, August 24, 1912 (C. A. Frost) I am also referring 

 to this species. The only other specimen before me referable to 

 this species is a female (9 mm.) from Grand Lake, Newfoundland, 

 June 28, 1906 (0. Bryant). It might be of interest to note in 

 connection with Mr. Curran's remarks under this species that 

 Walker also records Chrysotoxum fasciolatum from Albany River, 

 Hudson Bay (List of Diptera, vol. 4, p. 541, 1849). 



Chrysotoxum pubescens Loew. 

 Chrysotoxum luteopilosum Curran, Can. Ent., vol. 56, p. 36, 1924. 



The specimen which I compared with the type agrees in every 

 respect with the paratypes of Chrysotoxum luteopilosum Curran in 

 the Society's and my own collection. The yellow spot above the 

 front coxae was evidently overlooked by Loew in describing it. 

 "Alae cinereo-hyalinae, adversus costam lutescentes," can only 

 apply to this species, as none of the other species has a distinctly 

 yellow costal margin. That this is Chrysotoxum pubescens is 

 further corroborated by specimens in the Osten Sacken collection 

 from "Illinois," bearing the number "94" and labeled "Chryso- 

 toxum pubescens" in Osten Sacken's handwriting. In regard to 

 numbered specimens Osten Sacken in his "Record of my Life 

 Work in Entomology," 1903, p. 94, says: "Labels with numbers 

 corresponding to the same numbers in the Osten Sacken collection 

 (in the same museum) represent specimens which were sent to 

 Loew, while keeping duplicate specimens in my own collection." 

 There seems to be no doubt that these are some of the original lot. 



Chrysotoxum laterale Loew. 



This species is allied to Chrysotoxum pubescens, but the broad 

 yellow lateral margin and almost complete fasciae on the third 

 to fifth abdominal segments readily distinguish the species. The 

 costal margin is brown, and there is a dull yellowish spot above 

 the front coxae. In New England it is rare; I took one specimen 

 at New Haven, Connecticut, June 11, 1914, and it is recorded from 

 "Maine" by Curran. 



