ART. 9 TWO-WIXGED FLIES OF TRIBE MILTOGRAMMINI ALLEN 65 



ceps shorter and much stouter than the inner, with ])roadly rounded, 

 spatulate tips; penis with dehcate membranous hood, supported by 

 a heavily chitinized rod which is Y-shaped in profile, one arm of the 

 "Y" encircling the basal part of the hood anteriorly; claspers small 

 and sharply pointed. Wings hyaline; apical cell narrowly open; 

 section of fourth vein beyond the bend strongly arcuate; one to 

 three bristles at base of third vein-. The female differs strikingly in 

 appearance from the male, having the frontal vitta brown and not 

 barrel shaped in outline; a row of one reclinate and four t five pro- 

 clinate orbital bristles, of Vv^hich the anterior pairs are much the 

 krgest. Thorax uniformly gray pollinose with two obscure narrow 

 median vittae; scutellum also pollinose with obscure bronzed spots 

 at the sides; on the white pollinose abdomen, the first three segments 

 bear rows of sharply-defined, round, black spots, which are some- 

 times coalesced in an apical band. 



Length, 3.5 to 5.5 mm. 



Type.—Mide, Cat. No. 3631, U.S.N.M. 



The following material has been examined. Type, a male from 

 Algonquin, Illinois (W. A. Nason) ; two other specimens from Algon- 

 quin bearing Coquillett's name and one specimens from Altadena, 

 California, presumably of the type series; one, Franconia, New 

 Hampshire (Mrs. Slosson) ; three, Lafayette, Indiana, two of which 

 labeled ''on log" (J. M. Aldrich) ; fourteen, Lewiston, and one, Moscow^, 

 Idaho (J. M. Aldrich) ; one, Boulder, Colorado; one Colorado (Coquil- 

 lett) ; one, Animas Park, New Mexico, 6,500 feet; all in the collection 

 of the National Museum. One Amherst, Massachusetts, and twelve, 

 Columbus, Ohio, taken largely from rocks in gravel pits and dumps, in 

 the collection of the writer. Specimens from several places in Massa- 

 chusetts, and from Hampton, New Hampshire, in the collection of the 

 Boston Natural History Society. Specimens from New Jersey in the 

 collection of Dr. C. W. Johnson. Several specimens from Massa- 

 chusetts and Pennsylvania in the collection of the Museum of Com- 

 parative Zoology at Cambridge, Massachusetts. 



Thompson ^* finds that the female reproductive apparatus of this 

 species resembles that of the other Miltogramminae studied. In the 

 first instar maggot, the usual longitudinal ribs or corrugations of the 

 cuticula are lacking, and not only the anterior borders but the entire 

 surface of the segments are interspersed with microscopic colorless 

 scales, which under high magnification are seen to be pointed and 

 directed backwards. The buccopharyngeal apparatus is of the same 

 type as that found in Metojna, Miltogramma, and other nearly related 

 genera. Grooves in the pharynx are wanting. 



3< Paris Edition du Bull. Biol, de la France et de la Belgique, Recherches sur les Dipteres Parasites, p. 

 107, 1921. 



,^)4292— 26t- -5 



