AKT. 9 TWO-WINGED FLIES OF TRIBE MILTOGEAMMHSTI ALLEN 89 



EUMACRONYCHIA STERNALIS, new species 



Very closely resembles E. decent, from which it differs in the 

 following characters: 



Male. — Front 0.385 of the head width (measurements of two 0.38 

 and 0.39, resjiectively) ; inner orbits parallel from vertex to base of 

 antennae; frontal vitta at level of lowest orbitals twice as wide as 

 either parafrontal; one reclinate and two ]:)roclinate orbital bristles; 

 vibrissae strongly approximated, to a distance scarcely exceeding 

 length of second antennal joint; third joint of antenna three times 

 length of second; arista thickened on basal two-fifths. Abdomen 

 black, at least the a])ex of fourth segment reddish; fourth sternite 

 conspicuously exposed and covered with short dense black villous 

 hairs. Inner forceps of the genitalia, when viev/ed from behind, not 

 bowed in the middle; outer forcejis about as stout as the inner pair, 

 grooved behind, broadly curved toward tip of inner forceps but 

 pointed toward penis at the extreme tip. Villosity on apical flexor 

 surface of middle tibia as long as half the width of tibia; hind tibia 

 with only ordinary black appressed hair. 



Female. — I have examined several s])ecimens which resemble the 

 male in having the inner orbits nearly parallel and the vibrissae 

 closely approximated and which are evidently conspecific with it. 

 They also very closely resemble the female described for E. decens, 

 from which they may be distinguished by the following characters: 

 Front slightly wider, averaging 0.415 in four specimens measuring 

 0.41, 0.41, 0.42, and 0.42, respectively. The first genital segment 

 simulates a fifth abdominal segment, with marginal macrochaetae, 

 but is not arched in an inverted V-shape manner. 



Length, 5.0 to 9.0 mm. 



Type.—Mnle. Cat. No. U.S.N.M. 28161, Galveston, Texas. 



Host relationships. — Unknown. 



Described from one male from Galveston, Texas, VIII-28-1914, 

 Bishopp No. 3516 (F. C. Bishopp); one male from Granada, Nica- 

 ragua (Baker) ; one female from Las Cruces, New Mexico, July 7, 

 marked "type" and evidently one of Townsend's cotypes of E. 

 decens incorrectly identified; one female from San Jose de Cabo, 

 southern California (Townsend) ; one female from Los Angeles 

 County, California, September; all in the collection of the National 

 Museum. One female from Brewster County, Texas, June 13-17, 

 1908 (Mitchell and Cushman) occurs in the Museum of Comparative 

 Zoology of Cambridge, Massachusetts; and one female from San 

 Jose, Guatemala, February 5, 1905, was seen in the collection of 

 Prof. J. S. Hine. 



