Vol. IX] MALLOCH— FLIES (DIPTERA) FROM CALIFORNIA 299 



parafacial at base of antenna about twice as wide as third 

 antennal joint, about half as wide at middle of face ; cheek 

 about one-third as high as eye and slightly higher than widest 

 part of parafacial, its lower margin with two or three series 

 of bristles, the upper series anteriorly upwardly curved ; vibris- 

 sa! angle in line with lower margin of eye, a few bristles 

 above vibrissa ; third antennal joint broad, about twice as long 

 as second ; arista pubescent. Thorax without strong pre- 

 sutural acrostichals ; postsutural dorso-centrals four ; prealar 

 about one-third as long as the bristle behind it ; scutellum bare 

 below and on sides ; hypopleura bare ; sternopleurals 2 :2, the 

 lower anterior bristle weak. Basal abdominal sternite bare. 

 Fore tibia unarmed at middle, with four apical bristles ; mid- 

 femur with an almost complete series of bristles on postero- 

 ventral surface ; mid-tibia with two or three posterior bristles, 

 and about eleven apical bristles, some of the latter very long ; 

 hind femur with an almost complete series of bristles on 

 antero-ventral surface and a few bristles on basal half of 

 postero-ventral ; hind tibia with two or three antero-ventral 

 and antero-dorsal bristles ; all tarsi longer than tibiae. Third 

 vein with one or two weak setulcC at base on under surface; 

 costal thorn long. 



Type, female, 7 mm. long. No. 524, C. A. S., San Fran- 

 cisco, Calif., April 15, 1919; E. P. Van Duzee, collector. 



Distinguished from its allies by the presence of the setulae 

 at base of third vein and the black-margined calyptrse. 



3. Limnophora incrassata, new species 



Male. — Black, subopaque, owing to the dense covering ol 

 pale gray pruinescence. Orbits, face, and cheeks with silvery 

 tomentum ; antennae and palpi black ; thorax with a faintly 

 indicated brown dorso-central vitta; abdomen with a pair of 

 subtriangular black spots on the basal three tergites, those on 

 second and third extending from near base to apex, fourth 

 tergite with the spots almost obsolete ; legs black ; wings clear, 

 veins black ; calyptrse white ; halteres yellow. 



Eyes separated by a little more than width across posterior 

 ocelli; orbits much wider than the linear interfrontalia, with 



