NO. 1938. THE DIPTEROUS FAMILY PHOBID^—MALLOCH. 4,4:5 



as second, fringe rather short and sparse — five bristles between end 

 of first vein and end of costa — fourth vein leaving at beyond fork, 

 regularly arcuate and ending distinctly in front of tip of wing; 

 halteres black. 



Length, barely 1 mm. 



One specimen Cordoba, Vera Cruz, Mexico, April 20, 1908 (Dr. A. 

 Fenyes), 



Type.— C&t. No. 14838, U.S.N.M. 



A comparison of the figures of this and the other two species will 

 serve to distinguish them. The anal protuberance in figure 12, Plate 

 38, is turned ventral surface out and in normal situation is much as 

 figured on Plate 41, figure 5. 



Genus APHIOCH^ETA Brues. 



TABLE OP GROUPS. 



1. Wings with a distinct spot-like brown patch between the fourth and fifth veins 



at tip Group A, p. 445, 



Wings without any spot-like darkening at tip 2. 



2. Front tarsi dilated, short, the metatarsi as thick as tibiae at tip Group B, p. 446. 



Front tarsi not noticeably thickened, the metatarsi always thinner than the tibiae 



at tip 3. 



3. Hind tibiae with two rows of setulae— one on the antero, and one on the postero- 



dorsal surfaces Group C, p. 447. 



Hind tibiae with only one row — that on the i^ostero-dorsal surface — or setulae 

 indistinct Group D, p. 452. 



Genus APHIOCHyETA, Group A. 



APmOCH.ffiTA CONGLOMERATA, new species. 



Male. — Black, hardly shining; frontal bristles strong, antennae 

 brownish, palpi yellow, rather strongly bristled ; dorso-central bristles 

 on thorax small, scutellum with two strong bristles and two minute 

 hairs anterior to them ; abdomen weakly bristled laterally on second 

 segment, segments of nearly equal length, hypophygium large, anal 

 protuberance brown, with a few hairs; mesopleura weakly bristled, 

 halteres black, legs brownish yellow, the hind pair darker, hind tibia 

 finely setulose; \^dngs grayish, tip narrowly brownish on anterior 

 margin and a rounded patch between the fourth and fifth veins of the 

 same color, this darkening is caused by the approximation of the very 

 minute hairs on the surface of the wings and is quite distinct from any 

 thickening or darkening of the membrane of the wing; costa to the 

 middle, first section slightl}^ longer than the remaming portion, thii'd 

 section about one-third as long as second, fringe very long and widely 

 placed, each side consisting of about 13 to 14 bristles, fourth mn 

 lea\ang at fork of third with a gentle curve and running nearh' straight 

 to near the tip of wing, seventh vein distinct, halteres black. 



Length, 2 mm. 



