G3 



X T E S. 



{^) Mlcrodon. About the Earopeaa species of this genus, see Loew, Verh. 

 Zool. Bot. Ver.. 1856. 



(2) Clirysotoxum. About the European species, see Loew, Verh, Zool. Bot. 

 Ver., 1856. 



(") Paragus aeneus. " The name aencus was given by Walker in 1849 when 

 there existed an aeneus Meigen (1823), now considered a synonym of tibialis 

 Fallen " (Verrall in litt.). 



(*) Chrysogaster. About the European species, see Loew, Stett. Eat. Z., 1813, 

 p. 204. 



(^) Chilosia. On the European species compare Loew, Verh. Zool. Bot. Ver., 

 1857. 



(^) Syrphus. Compare my paper : On the N. A. species of the genus Syr- 

 phus, in the Proc. Boston .Soc. Nat. Hist., 1875. 



{'') Syrphus geniculatus. About 8. guttatus Walker, Mr. Verrall writes me 

 that it resembles umhellatarum; hence I ^place it as a doubtful synonym of 

 the American uiribellatarwin. 



{^) Didea fuscipes. Diilers from the European D. fasciata in the color of 

 the legs only (Lw. Cent. IV, 82). Again my B. laxa with its greenish color, 

 is the representative of the European D. alneti. ' 



(') Sphderophoria. I restore this name, however incorrect its termination 

 may be, as Melitareptus was used long before 1840 for a genus of birds. 



(^ ") Allograpta. Scaeva ohliqua Say, cannot well be placed in any of the 

 existing genera of this group. It does not possess the characteristic marks 

 of Mesograpta (peculiar shape of the ocellar triangle in the msBe, and peculiar 

 coloring of the thorax) ; it has not the large development of the hypopygium 

 of the male of SphaeropJioria ; it might be placed among the species of i<yr- 

 phus with a linear abdomen. But, in the first place, these species Avill, soonei; 

 or later, have to be separated from the bulk of the genus ; and, in the next 

 place, Scaeva ohliqua possesses in the structure of the eyes of the male, and 

 in the peculiar markings of its abdomen, sufficient characters of its own. 

 The eyes of the male are divided in two parts by a well defined line, above 

 which the facets are larger than below ; the line lies a little lower than the 

 antennae and thus divides the eye in two unequal parts, the upper one of- which 

 is a little larger ; its coloring, in life, is more red, the lower half is more pur- 

 plish. This character, very 'striking in life, is also visible in dried specimens. 

 I have not observed it in the species of Syrphus, or of Sphaerophoria, or of 

 Mesograpta, which I examined alive. The name Allograpta is given in allusion 

 to the peculiar coloration of the typical species. Scaeva emarginata Say, which 

 I do not possess, is provisionally placed in the same genus. I suspect that 

 more than one Syrphus from Mexico and the West Indies belongs to the same 

 group; as for instance S. delineatus llacq., but, of course, it is impossible to 

 judge from descriptions alone. 



