INSECUTOR INSCITI.^ MENSTRUUS 117 



the male, Gran Chaco, margin of the River Tapenaga, Colonic 

 Fiorencia, Argentina, 1903 (E.-R. Wagner). The females 

 were sent by Dr. Juana Petrocchi, the male is from the Paris 

 Museum by the kindness of M. Seguy. Another male and two 

 females have been returned to Paris. Of these, one female 

 bears the same data as cited ; another, Gran Chaco, Loma Negra, 

 north of Fiorencia and of Rio Tapenaga, 1903 (E.-R. Wag- 

 ner) ; the male is labeled, Province of Santiago del Estero, 

 Troncal, 40 kil. from Salavina, 1909 (E.-R. Wagner). 



This is apparently the species identified by Lynch Arri- 

 balzaga as Psorophora ciliata (Rev. Mus. de La Plata, ii, 140, 

 plate iv, fig. 3, 1891). I'f the bare spaces of my figure (PI. IV, 

 fig. 5) are made black, as is their actual color, the appearance 

 of Arribalzaga's figure is reproduced. (See PI. IV, fig. 6.) 



A REVISION OF THE CHILOSINI 



{Diptera, Syrphidae) 



By RAYMOND C. SHANNON 



In my recent paper, "A Reclassification of the Subfamilies 

 and Genera of North American Syrphidae" ^ an attempt was 

 made to reclassify the genera of the Chilosinae. Lately, while 

 writing a synopsis of the Chilosini, supplementary characters 

 have been found which may further aid to classify its sub- 

 family. The facial tubercle is a striking characteristic of the 

 Chilosini, but other genera of the Chilosinae have this structure 

 and for this reason a key is given to all of the tuberculate face 

 forms of this subfamily in order to prevent confusion. 



It might be stated that the author has been more interested 

 in discovering new group characters to use in classifying the 

 Syrphidae than in discovering new species. A number of char- 

 acters have been found in the Chilosini and because of their 

 newness some word of explanation should be added. 



1 Bull. Brook. Ent. Soc, vol. xvi, 1921. 



