ART. 1 NEW TWO-WINGED FLIES TOWNSEND d 



wide, its membrane bare and not inflated; prescutum much shorter 

 than postscutum; postalar wall, tympanic ridge, and pit bare; 

 greater ampulla very small, seedlike, somewhat raised, convex, bare ; 

 1 preacrostichal, the middle one; 1 postacrostichal, 2 jDresuturals, 3 

 postsuturals ; 1 preintraalar, the front one; 2 postintraalars, 1 pre- 

 supraalar, 1 postsupraalar, 3 humerals, 1 intrahumeral, no post- 

 humeral, 2 postalars, no intrapostalar, 2 or 3 mesopleurals and many 

 hairs below, one weak upper mesopleural, 1 mesopleural-spiracular, 

 1 proj^leural; 1 sternopleural, the front one; pteropleura with a few 

 bristles in a bunch, 5 hypopleurals ; 2 lateral scutellars, middle one 

 lacking, hind one strong, no apicals. 



Wings (fig. 2) little over twice as long as broad, wide on middle 

 and narrowing at both base and tip, veins crowded into less than 

 costal half; alulae rather large, erect, half as wide as long; costal 

 spine quite strong, as long as small cross vein; remigium bare, its 



Figure 2. — Oligooestrus oestroideus, new genus and species : Wing 



inferior proximal process also bare; apical cell long-petiolate, the 

 petiole as long as hind cross vein, in line with third vein and reaching 

 margin nearly twice the length of hind cross vein before wing tip; 

 first vein bare and terminating close beyond auxiliary vein ; third vein 

 with 2 microbristles at base; small cross vein short, straight, nearly 

 on outer two-thirds of discal cell, opposite tip of hind cross vein, 

 halfway between tips of auxiliary and first veins; apical cross vein 

 sinuate, long stump and wrinkle at cubitulus; latter angular, very 

 obtuse, three-fifths wing width from hind margin; hind cross vein 

 sinuate, midway between small cross vein and cubitulus, nearly paral- 

 lel with apical cross vein ; fifth vein bare, its last section much longer 

 than preceding section ; squamae bare, nearly as wide as long, rounded 

 on both outer and inner hind corners, somewhat projecting outside, 

 squamae nearly one-fifth their area. 



Legs not elongate, not stout, rather finely bristled, tarsi moderately 

 long and all joints well bristled, front coxae little longer than hind 



