ART. 9 TWO- WINGED FLIES OF TEIBE MILTOGEAMMINI ALLEN 25 



surface. Wings without costal spine: third vein with one to two 

 small bristles at its base. 



Female. — Front at narrowest 0.25 of head width (measurements of 

 five as follows: 0.25, 0.25, 0.25' 0.25, 0.26); otherwise except for 

 usual sexual differences of pulvilli and genitalia, like the male. 



Length, 3.5 to 6 mm. 



This species is well represented by both males and females in all 

 collections examined by me. Redescribed from a long series of 

 specimens from the following localities: Massachusetts; Button 

 Woods, Rhode Island; Lahaway, Ocean County, Ocean Grove, 

 New Jersey; Chesapeake Beach, Plummer Island, Maryland; San- 

 dusk}^, Cincinnati, Blackhand, Ohio; Lafayette, Plymouth, Michigan 

 City, Indiana; Raleigh, Laurel Hill, North Carohna; Georgia; 

 Miami, White Sulphur Springs, Florida; Holly Springs, Starkville, 

 McPIenry, Ocean Springs, Mississippi; College vStation, Texas; 

 Colorado; Socorro, New Mexico; Ormsb}^ County, Nevada; Ciare- 

 mont County, California; Moscow, Julietta, Idaho; Owl Creek 

 Mountains, Wyoming; Umatilla, Oregon; Sea Cliff, Long Island, 

 labeled ''on beach and salt grass"; Koebler, New Mexico, labeled 

 ''Webster No. 7707," (W. R. Walton); one female labeled "Parker 

 Note No, 18" and another female, "Parker Note No. 27"; one 

 female, reared from nest of Bicyrtes quadrifasciata, Adaton, Missis- 

 .sippi, Aug., 1922. and several males from flowers of Erigeron, Agri- 

 cultural and Mechanical College, Mississippi (H. W. Allen). 



The puparium possesses the following characters: Yellowish-brown 

 in color, with small, backwardly-directed spines encircling the anterior 

 part ol the thoracic segments, but limited to ventral parts of ad- 

 dominal segments; anal segment without well-developed spines 

 above the depression; from lateral view, broadest at middle, the 

 dorsal and ventral margins convex; anterior spiracle with six papillae; 

 anal depression moderately deep. 



This species has been identified by the wTiter from many localities 

 ranging from Massachusetts, Idaho, and Oregon on the north, to 

 Florida, Texas, and California, indicating that it is generally dis- 

 tributed throughout continental United wStates. It has been reported 

 in literature from Canada, certain islands of the West Indies, and 

 Mexico, but it should be remembered that other nearly related species 

 have long been confused with this form, hence such records must 

 necessarily be verified before being accepted. 



The published records relating to the biology of this species are 

 few and those we have are open to doubt as to the correctness of 

 determination. Professor Osborn's interesting notes on wasp-trailing 

 flies " probably refer to rubriventris, though they may be referable 



■» Ohio Naturalist . vol. 7, no. 2. p. 38. 



