99 



Chrysotoxum plumeum, new species. 

 Chrysotoxum ventricosum Curran (nee Loew), Can. Ent., vol. 56, p. 39, 1924. 



d" . — Face in profile straight, below the antennae, not noticeably concave and 

 not protruding at the lower end of the facial stripe; face yellow with yellowish 

 pile, front and vertex black with black pile, upper part of the front whitish 

 pollinose; antennae brownish black, first and second joints about equal in 

 length, the third as long as the first and second combined, arista yellow; 

 scutellum yellow with a dark discal spot and long yellow pile; a pearl-gray spot 

 above the front coxae; abdomen with prominent yellow pile, longest on the 

 second segment, first segment yellow on the sides, second, third, and fourth 

 segments with slightly arcuate bands, narrowly interrupted, those on the 

 second and third reaching the lateral margin, the fourth narrowly separated; 

 posterior marginal band on the second segment very narrow, on the third wider 

 and expanded at the center, on the fourth more expanded and projecting 

 forward as a point; fifth segment with two oblong yellow spots and a central 

 triangle, narrowly connected with the spots near the posterior angles; legs 

 yellow, basal third of the first and middle femora dark brown; wings grayish 

 hyaline with the brownish costal margin extending to the end of the costal vein. 

 Length 10 mm. 



9 . — Front with a wide whitish-pollinose band midway between the base of 

 the antennae and the ocelli, narrowly interrupted; band on the posterior 

 margin of the fourth abdominal segment connected at the lateral margin; the 

 spots and triangle on the fifth segment are narrower, more elongated and very 

 narrowly separated at the posterior angle. Legs entirely yellow. Length 

 11 mm. 



Eight specimens. Holotype, Woodbury, New Jersey, April 29; 

 allotype, Riverton, New Jersey, September 14. Paratypes, 

 Folsom, Pennsylvania, May 8, 1892, and Riverton, New Jersey, 

 September 8, in the author's collection; Montgomery, Massa- 

 chusetts, May 27, 1899 (Dr. Geo. Dimmock), and South Norwalk, 

 Connecticut, August 4, 1908, in the collection of the Boston 

 Society of Natural History; Falls Church, Virginia, May 9 and 

 September 23 (Nathan Banks), in the Museum of Comparative 

 Zoology. 



Readily separated from the following species by its straight, 

 not concave, face and usually shorter antennae. 



Chrysotoxum perplexum, new species. 



e? . — Face convex with a prominent tubercule at the lower end of the facial 

 stripe, vertex and front black, the latter with the upper part whitish pollinose; 

 the first joint of the antennae longer than the second and the third slightly 

 longer than the first and second combined, arista reddish; scutellum with a 

 broad transverse black band, leaving a narrow basal and apical margin of 

 yellow; sides of the first abdominal segment yellow, the arcuate bands on the 

 other segments narrowly interrupted; those on the second and third segments 

 extend to the lateral margin, that on the fourth narrowly separated; posterior 

 margin of the second segment entirely black; on the third and fourth the 

 yellow posterior marginal band is narrow on the sides and expanding in the 

 middle, widest on the fourth; the two elongated spots on the fifth segment are 

 curved and the central triangle is small, leaving a very broad V-shaped mark; 

 base of the front and middle femora dark brown, costal margin of the wing 

 brown. Length 12 mm. Female similar to the male. 



Holotype, Base Station, Mt. Washington, New Hampshire, 

 August 16, 1916 (C. W. J.); allotype, Bolten Mt., Vermont, 



