AKT. 11 CHRYSOTOXINE SYRPHID-FLIES — SHANNON 9 



Female — Frons of usual width, black with a moderate size pair 

 of pollinose spots. Length, 13-14 mm. ; wing, 12 mm. 



Close to ypsilon^ which is larger and more robust; the abdominal 

 bands broader, apical corners of tergites strongly projecting; and 

 the sternites, except the first, with a pair of large yellow spots 

 besides the yellow post margins. 



The material recorded by Giglio Tos as Chrysotoxum integt'wn 

 Williston, from Mexico, has been examined by the writer. All these 

 specimens are the same as this new species, aztec. 



Type locality. — Sierra Madre, Chihuahua, Mexico. 



Type.— Cdit. No. 28310, U.S.N.M. Male type; allotype, female; 

 two male paratypes. 



Distribution. — Mexico: Sierra Madre, Chihuahua, 7,300 feet, Au- 

 gust 28 and September 9 (C. H. T. Townsend) ; Mound Valley, 

 Chihuahua, August 23 (C. H. T. Townsend) ; Sanchez, Chihuahua 

 (C. H. T. Townsend). 



CHRYSOTOXUM OCCroENTALE Curran 



Chrysotoxum occidentale Curran', Can. Ent., vol. 56, 1924, p. 30. 



A large robust species which differs from ypsilon in having black 

 hairs on the apices of the fore coxae and the base of the abdomen 

 black pilose. A male (hitherto unknown) agrees with the paratype 

 female in these respects. 



Length, 17-18 mm. 



One male and one female. 



Type locality. — British Columbia. 



Type. — In Canadian National Collection. 



Distribution. — Idaho: Moscow Mountains, July 10, 1920 (R. C. 

 Shannon). British Columbia: Kaslo, June 5 (H. G. Dyar). 



CHRYSOTOXUM LATERALE Loew 



Chrysotoxum laterale Loew, Berlin Ent. Zeit., vol. 8, 1864, p. 42. 



The status of this species is uncertain. Only the female is known 

 and its characterization is unsatisfactory. Characterized by the short 

 second antennal joint, the relative lengths of the joints being 

 1:0.75:2.5; the pteropleura and base of abdomen with black pile; 

 the arcuate bands of the abdomen reaching the sides of the abdomen 

 which are alternate black and yellow; the apical corners of the 

 tergites projecting. Length, 12-14 mm. Two females. 



Type locality. — Nebraska. 



Type. — In Cambridge Museum, Comparative Zoology. 



Distribution. — New York : Lake George, September 4, 1920 (M. D. 

 Leonard). New Hampshire: White Mountains, July (S. Scudder). 

 2995—26 2 



