154 C. R. Osten Sacken: 



Ovipositor, two short, rather obtusc lamels. — (Loew. 1S77, p. 83; 

 Dr. F. M., fig. 23.) 



NB. The females of Bihioc, Agathon, Lij). hilob., Lip. yos., Hamm., 

 Palt, Hapal., are as j'et unknown. 



B. Cliaracters tliat are diifereiit in diifereut geiiera. 

 Aiitennae, 14- or 15-jointed; in tliree genera 9- or 10-jointed. 



In the genera of the first group (comp, the Anal, table) I counted 15j., 

 except in Bleph. ancilla and Lip. yosem. where I counted 14, with an 

 indication of a lötii joint (0. S. 1878, p. 409). In the second group, 

 Snowia and Curupira have 14 joints; in some rare cases Dr. M. counted 

 15 (p. 81, 1. 7 from bottom). In Paltostoma Schincr counted only 13; 

 Loew in Hamm. IOC:*); Bigot in Apist. 9, Q ; Verrall 10, (/, 

 Hapal. has 10(?). Ant. longer than the head, joints of the flagellum 

 elongate: Bleph., Lip. Ant. but little longer, or shorter, than the 

 head: Bihioc, Agathon, Apist, Hamm... Palt, Snoivia, Hapal. (The 

 latter genus has the joints of the flag., especially the raiddle ones, 

 short and stout; Hamm, has the last Joint conspicuously large.) First 

 Joint of the antennal scapus smaller than the second: Bleph., Lip., 

 Apist., Hamm., Bihioc, Snoioia, Palt.(?) 



NB. In Bleph. ancilla 1 described the joints of the scapus as of nearly 

 the same length, the second a little stouter (0. S. Cat. N. A, Dipt. 

 1878, p. 266). 



Second Joint of ant. scapus somewhat arcuated: A2nst, Bihioc 



Eyes. 



A. Contiguous on the front: Bihioc. Agathon, Bleph., Hamm., 



Hapal., Curupira. 



NB. Bleph. (in both sexes, Loew, 1877, p.64), Agathon and Curupira 

 (Dr. F. M. of fig. 7) have the eyes subcontiguous, with a very 

 narrow, linear front between them. Loew (1877, p. 74) supposes 

 this may also be the case with Hamm. 



b. Bisected by an unfacetted stripe; facets larger above the 

 stripe than below: Bleph., Hamm. 



bb. Bisected by a deep groove, or by a mere line; facets 

 larger above the stripe than below. 



Bihioc; Agathon; Bleph. ancilla. 

 AA. Separated by a more or less broad front. 



c. Bisected by an unfacetted stripe; facets larger above 

 the stripe than below.') — Apist. 



') Bigot answered to Haliday, upon bis inquiry aboiit this point: 

 1° „che la difFerente grandezza delle faccette nelle due regioni degli 

 occbi existe di fatto, sebbene non facile a constatarsi suH' unico csem- 



