312 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io« 



Creek Canyon, Coconino National Forest, Ariz., June 21, 1951; 1 

 female, Madera Canyon, Coronado National Forest, Ariz,, June 16, 

 1951 ; 1 female, Patagonia, Ariz., June 15, 1951. All paratypes are in 

 the author's collection. 



Latheticontyia infumata^ new species 



FiQURB 2,eJ 



Female: Face, cheek, clypeus, palpi, and proboscis pale whitish 

 yellow; upper face with numerous (20 or more) small black hairs 

 extending from lunule nearly halfway to oral margin; palpi with 

 scattered black hairs and bristles; behind the center of the eye is a 

 large brown area coinciding in position with the prominent brown 

 pleural stripe. 



Color pattern of front as in figure 2,e, the orbits creamy yellow up 

 to the middle orbital, the postlunular triangular area more orange. 

 All antennal segments black on upper and outer surfaces, pale yellow 

 on lower and inner surfaces except that the apical third of inner side 

 of third segment is also black; arista micropubescent, black, its basal 

 joint large, inserted at about one-third from apex dorsally; anterior 

 orbital two-thirds the length of middle one, the latter five-sixths 

 the length of the posterior one. 



Color pattern of mesonotum, pleura, and legs as in figure 2,e,f; 

 acrostichal hairs sparse, irregular, the two median rows diverging along 

 the edges of the triangular yellow stripe, the last hair in each row 

 tending to be a bit enlarged. Apical scutellars nearly four times 

 the length of the other two. Halteres yellow. Wings uniformly 

 blackened, a bit darker over the crossveins. 



Tergites subshining brownish black dorsally, the last two with some 

 degree of yellow apical margins ; all tergites yellow on lateral margins. 



Body length (abdomen extended), 4.0 mm.; wing, 3.3 mm. 



Types: Holotype female, USNM 62899, Santa Maria de Ostuma, 

 north of Matagalpa, Nicaragua, June 1954, W. B. Heed collector. 

 There are two paratype females with the same collection data (auth- 

 or's collection). Mr. Heed states that his collections were made 

 mostly on a coffee finca on the western slope of the mountains at an 

 elevation of about 4,000 feet; above the finca was a dense cloud forest 

 and below it the forest was mostly pine. 



Discussion 



Several years have been spent in an attempt to detennine the 

 family affinities of Latheiicomyia, but it now seems fairly obvious 

 that the particular combination of characters present in these flies 

 does not occur in any described family. On general appearance, a 



