1922] Bezzi: South American Chiromyza 119 



III. Chiromyza Wiedemann. 



The genus Xenomorpha Macquart, with the type leptiformis Macq. 

 from Rio Janeiro, is evidently the same; likewise the genus Nonacris 

 Walker.* with the type transequa Walk, from South America; and 

 even the genus Lagarus Philippi with the type paulseni Phil, from 

 Chile, and Lagarinus Enderlein with the type paradoxus End. from 

 Chile, as pointed out by Mr. Hardy. 



It may be noted that in the original figure of the type species 

 by Wiedemann the second longitudinal vein of the wings was 

 omitted, perhaps accidentally. This vein is well shown in the 

 figure of Xenomorpha by Macquart. 



The South American forms before me can be distinguished 

 as follows: 



1. (8) Anal cell long, its terminal stalk being much shorter than the preceding 



part of the postical vein; halteres and coxae of a pale yellowish color. 



2. (7) The fourth longitudinal vein is forked before the hind crossvein, which 



is always complete; the second posterior cell is therefore sessile and rather 

 obtuse at base; the third vein issuing from the discoidal cell frequently 

 present in the shape of a short stump; scutellum never greenish. 



3. (4) Back of thorax with four longitudinal dark stripes; pleura with several 



blackish spots vittata Wied. 



4. (3) Thorax with three longitudinal stripes only, or not evenly striped. 



5. (6) The 3 dark stripes on thorax are broad and partly confluent, the back 



appearing thus in great part infuscated fuscana, Wied 



6. (5) The above named stripes less developed and often obliterated, the back 



appearing for the most part reddish yellow ochracea Wied. 



7. (2) The fourth vein forks beyond the hind cross-vein, which is often obliterated 



in its upper portion, or quite wanting; the second posterior cell is there- 

 fore acute at base and mostly provided with a short stalk; the rudiment of 

 the third branch of media is never present; sides of thorax and of scutellum 

 greenish viridis n. var. 



8. (1) Anal cell rather short, its stalk being about as long as the preceding portion 



of the postical vein; the whole antennae, the halteres and the coxae quite 

 black nigra n. sp. 



1. Chiromyza vittata Wied. (leptiformis Macq.) 



As shown in the original figures by Wiedemann and by Macquart, 

 the main character of the present form is that of the divided middle 

 dark stripe of the back of mesonotum, which has therefore 4 longitudinal 

 stripes. I have in my collection 3 female specimens from S. Sebastiao, 

 seashore of the State of S. Paulo, Brazil, collected by the Count A. A. 

 Barbiellini. They agree in having the discoidal cell broad and obtuse 

 outwardly, the second posterior cell with broad sessile base, the anal 

 cell with short terminal stalk. One specimen only shows the short 

 basal rudiment of M 3. The scutellum of the female has a shining 

 black depression on each side at base ; the same depression in the male is 

 reddish or only a little darkened. 



*It must be noted that in the original description for "Fourth posterior areo- 

 let closed before the border", the anal cell is meant. 



