ART. 9 FLIES OP THE FAMILY SYRPHIDAE — SHANNON 27 



SYRPHUS GAYI Macquart 



Syrphus gayi Macguaet, Dipt. Exot., vol. 2, pt. 2, 1842, p. 90. 



One male and three females (determined by Aldrich as this 

 species) agree so closely with the description of >S'. gayi that it seems 

 best to let them stand under this name. The only discrepancy be- 

 tween the specimens and the description lies in the color of the last 

 abdominal segment. The description states that the last segment 

 is black with the hind border yellow. In the present specimens the 

 anterior corners of this segment are broadly yellow, this color con- 

 tinuing along the side margins to the hind margin, which is mainly 

 black. 



Male and female. — Front, both sexes, black aeneous; third an- 

 tennal joint black; legs yellow, bases of femora black, the tarsi 

 brownish; second, third, and fourth tergites each with a pair of 

 very large, reddish yellow spots which extend over the sides of the 

 abdomen; lower squamae pilose. This last character allies the 

 species to the ribesii group of the genus Syrphus. 



Four specimens, Santiago, Chile (A. Faz). 



SYRPHUS REEDI, new species 



Male and feinale. — Lower squamae pilose, therefore allied to the 

 ribesii group. Ocellar triangle of male and vertex of female dark 

 aeneous, the front light aeneous, with black pile; antenna moderate, 

 reddish yellow below, brownish above; arista reddish brown; in 

 the female the third joint is one and one-half times the width of the 

 front across ocelli; face yellow, mostly pale pilose, the tubercle 

 moderate, jowls also yellow; mesonotum greenish aeneous, the sides 

 somewhat yellowish with yellow pile; legs yellow, the extreme bases 

 of the femora dark brown to black; hind tarsi a little brownish: 

 second tergite with a pair of large yellow spots which extend for- 

 ward along the sides to the anterior corners of the first tergite; 

 third and fourth tergites each with an anterior yellow tranverse 

 stripe which extends over the sides of the abdomen in their full 

 width; hind margins of the fourth and fifth tergites yellowish; 

 wings slightly infuscated, more so anteriorly. Length 12 mm.; 

 wing 11 mm. 



This species resembles S. ribesii very closely. The antennae are 

 distinctly smaller in ribesii, the femora of this species are more ex- 

 tensively black basally, in the male the hind femur is black on the 

 basal half and the female has a median dark ring at the middle. 

 Also the yellow stripes on the third and fourth tergites in ribesii 

 are broader. 



This species, 7'eedi, may eventually prove to be Syrphus similis 

 Blanchard, which is said to resemble >S'. ribesii. However, the de- 



