ART. 9 TWO-WINGED FLIES OF TRIBE MILTOGRAMMINI ALLEN 103 



prolonged laterally and ventrally to near the median ventral line; 

 second segment with a lateral and one median marginal pair of bris- 

 tles, third and fourth each with a marginal row of about eight; all 

 abdominal macrochaetae weak, being comewhat shorter than the 

 segment upon which they occur. Wings hyaline; fourth vein be- 

 yond bend but slightly arcuate, parallel to hind cross vein; last 

 section of fifth vein equals one-tliird preceding section; one very 

 small costal spine; three or four small bristles on third vein extend- 

 ing scarcely halfway to small cross vein. Legs black; pul villi dis- 

 tinctly shorter than the last tarsal joint; middle tibia with one 

 bristle on outer front side near middle; liind tibia on outside with 

 row of six to nine unequal bristles, extending considerably below the 

 middle. 



Male. — Not known. 



Length, 4.0 to 5.0 mm. 



Type.— Female. Cat. No. 28165, U.S.N.M. Pecos, New Mexico. 



Host relationships. — Unknown. 



Described from two females in the National Museum from the 

 following localities : Pecos, New Mexico, September. 5 (Cockerell); Las 

 Vegas, New Mexico, 1918, labeled ''T. D. 4430" (H. S. Barber). 



EXPLANATION OF PLATES 



Plate 1 



a c=anterior claspers; i/= inner forceps; o/=outer forceps; p = penis; p c=pos- 



terior claspers. 



Fig. 1. Male genitalia of Metopia leucocephala Rossi. 



2. Male genitalia of Metopia campestris Fallen. 



3. Male genitalia of Hilarella hilarella Zetterstedt. 



4. Male genitalia of Sphenometopa tergata Coquillett. 



5. Male genitalia of Opsidia gonioides Coquillett. 



6. Male genitalia of Phrosinella fulvicornis Coquillett. 



Plate 2 

 For explanation of letter see Plate 1. 



Fig. 7. Male genitalia of Senotainia trilineata Van der Wulp. 



8. Male genitalia of Senotainia rubriventris Macquart. 



9. Male genitalia of Senotainia flavicornis Townsend. 



10. Male genitalia of Senotainia litoralis Allen. 



11. Male genitalia of Senotainia vigilans Allen. 



12. Male genitalia of Pachyophthalmus floridensis Townsend. 



Plate 3 

 For explanation of letters see Plate 1. 



Fig. 13. Male genitalia of Pachyophthalmus signatus Meigen 



14. Male genitalia of Pachyophthalmus distortus, new species. 



15. Fore tarsus of male, Phrosinella pilosifrons, new species, viewed from 



the side. 



