ART. n CHRYSOTOXINE SYEPHID-FLIES SHANNON 11 



CHRYSOTOXUM INTEGRUM WiUiston 



Chrysotoxum integre Williston, Synopsis N. A. Syrphidae, 1886, p. 16. — 



CuERAN, Can. Ent., vol 56, 1924, p. 39. 

 Chrysotoxum coloradense Greene, Curkan, Can, Ent., vol. 56, 1924, p. 39 



(in part). 



A moderate sized species. Antennal joints about 1:1:2 in the 

 male, and 1 : 1.25 : 3 in the female, apical corners of tergites distinctly 

 projecting; arcuate abdominal bands entire and attaining side mar- 

 gins; sternites 2, 3, 4, and, in female, 5, with yellow postmargins 

 and except the second with a pair of yellow spots. The relative 

 lengths of the fifth tergite are 3.5:1:1 (compare with coloradense). 



Length, 12-14 mm. 



The material recorded by Williston in the Biologia Centrali- Amer- 

 icana as " Chrysotoxum sp. ? " are all slight variations of integrum 

 Williston, not sujfficiently marked to rank as different species. 



The specimen recorded by Giglo Tos as integre (Ditteri Messico) 

 is aztec Shannon. 



Ten males, nine females. 



Type locality. — Arizona. 



Type. — In United States National Museum, 



Distribution. — Arizona: Locality? (Cornell University, lot 35, 

 Williston collection) ; East Verde River, 4,500 feet. Mexico : Sierra 

 Madre, Chihuahua, 7,300 feet, July 21 (C. H, T. Townsend) ; San 

 Jacinto, D. F., August, 1923 (E, G, Smyth) ; Mexico City (Juan 

 Miiller), New Mexico: Springer, August 18, 1914 (W, R. Wal- 

 ton) ; Dripping Spring, Organ Mountains, April 24 (T, D, 

 A. Cockerell). Utah: Blue Springs, 8,000 feet, August 29, 1923 

 (G. P. Engelhardt). Idaho: Moscow Mountains (J. M. Aldrich). 

 Washington: Wawawai, May 30, 1923 (V. Argo) ; Asotin, May 19, 

 1923 (V. Argo), 



CHRYSOTOXUM PUBESCENS Loew 



Chrysotoxum pubcscens Loew, Wien Ent. Monat., vol. 4, 1860, p. 84. — 

 Greene, Proc. Ent. Soc. Wash., vol. 25, 1923, p. 84 (Puparium de- 

 scribed). 



Chrysotoxum derivatum Walker, Howard, Insect Book, 1901, pi. 21, fig. 31 

 ( misidentification ) . 



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



Chrysotoxum currani Wehr, Univ. Studies Nebraska, vol. 22, Jan. 10, 1924, 

 p. 9. 



Chrysotoxum cuneatum Wehr, Univ. Stud. Neb., vol. 22, Jan. 10, 1924, p. 10. 



A fairly large species easily recognized by the following charac- 

 ters : Antenna with the relative length of the joints about 1 : 1.5 : 2 ; 

 the distinct yellow spot above the fore coxa; the interrupted bands 

 on tergites 2, 3, and 4 attaining the apical corners ; apical corners of 



