I30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5 1 



2. Wings infuscate on less than costal half, gray or hyaline on other 



portion Acaulona 



Wings almost wholly infuscate, but much more faintly so on inner half, 

 the infuscation rather graduated into almost hyaline on inner border. 



Euacaulona 



3. Wings wholly infuscate 4 



Wings more or less widely hyaline on inner border, the hyaline 



abruptly defined 6 



4. Hind femora ciliate with closely appressed flattened bristles on one or 



opposite edges Galactomyia (males) 



Hind femora not ciliate at all 5 



5. Apical cell open Homogenia 



Apical cell closed Euomogenia 



6. Wings hyaline on more than inner half, abdomen subcylindrical in both 



sexes and largely translucent in both Pennapoda 



Wings with inner hyaline border almost as wide as the infuscate 



costal half, abdomen subcylindric in both sexes and wholly opaque 



in both Polistomyia 



Wings with hyaline border about one-third width of wing. . .Eutrichopoda 

 Wings with hyaline border very narrow, not over one-fifth of wing 



width 7 



7. Wholly black form Galactomyia lanipes (female) 



Partly reddish forms 8 



8. Hind femora ciliate distally on inner edge with closely placed bristles ; 



abdomen cylindrical, reddish or orange with apical half or at least 



anal segment black Galactomyia radiata (female) 



Hind femora not at all ciliate, smaller forms with abdomen more or 

 less flattened and almost wholly light reddish or yellowish in both 

 sexes Trichopoda 



Genus Acaulona van der Wulp 



Acaulona costata van der Wulp. — One female, Tehuantepec, Su- 

 mlchrast ; one male, Frontera, Tabasco, February 9, Townsend. The 

 Tehuantepec specimen is of much lighter coloration than Veracruz 

 and Tabasco specimens. Tegulae are yellowish in this genus. 



Acaulona tehuantepeca, sp. nov. 



One female, Tehuantepec, Sumichrast. Labeled "17. Homogenia 

 sp." Length, 7 mm. 



Differs from A. costata in having the apical cell subfuscous, the 

 abdomen with a median blackish vitta and more or less wholly 

 blackish on apical half, and the hind tibiae weakly subciliate in a row 

 of short, closely approximated bristles. The form is intermediate 

 between Adaulona, Euacaulona, and Homogenia, but nearest to 

 Acaulona. 



Type— Cat No. 10,878, U. S. N. M. 



