AHT. 9 FLIES OF THE FAMILY SYRPHIDAE — SHANNON 23 



Very little has been written on the Chilean Diptera since that time 

 iind until recently (as far as the writer is aware) very little collect- 

 ing has been done. 



During the past few years Senor A. Faz has been making a study 

 of the Diptera of this region and has sent material to the United 

 States National Museum for identification. This material, supple- 

 mented by a small collection received years ago from Reed, as well 

 as a small lot of specimens loaned by the British Museum and a 

 few specimens from other sources, is the basis for the present small 

 contribution to the Chilean Syrphidae and also for part of another 

 paper, by the writer on the American Xylotini, which has been re- 

 cently published." 



Dr. J. M. Aldrich has attempted to learn the condition of the 

 collection which was used by Philippi as the basis for his publica- 

 tion but with negative results. 



MELANOSTOMA FENESTRATUM (Macquart) 



Syrphus fenestratum Macquabt, Dipt. Exot., vol. 2, 1842, p. 103. 

 Melanostoma ptmctulatum V. d. Wulp, Tijdschr. v. Entomol., vol 31, 1888, p. 

 375. 



Male and female. — This species has been considered a synonym 

 of stegnuvi S^y. They are very closely allied but certain differences 

 are present which serve to distinguish them as two species. 



The male of fenestratum has smaller and entirely black antennae ; 

 the face widens downward; the legs darker; the aeneous spots on the 

 fourth segment less than a third the length of the segment and iso- 

 lated. In stegnuTii the third joint is reddish brown, the face parallel 

 sided and the aeneous spots on the fourth tergite occupy half of the 

 segment and are connected together and to the aeneous hind margin 

 of the segment by a longitudinal aeneous stripe. 



In the female stegnum the front is broader and the antennae more 

 brightly colored than in fenestratum and the aeneous markings on 

 the fourth segment are, in each case, in agreement with those found 

 in their respective males. 



One male, five females. 



Chile : Santiago, October 9, 1921, (A. Faz) ; Angol, May 23, 1925. 



Genus MESOGRAMMA Loew 



Mesogramma Loew, Berlin Ent. Zeitschr., vol. 9, 1865, p. 157. 

 Only two species of this genus, hitherto considered under the genus 

 Syrphus^ are known from Chile. 



'Proc. U. S. Nat. Mus., vol. 69, no. 2635, 1926, pp. 1-52. 



