234 Journal New York Entomological Society, [^oi. xxiii, 



shorter, four very short and not glabrous. Female forceps meeting 

 apically in a curve, armed with teeth, the closed forceps forming an 

 almost perfect circle. Proboscis short and fleshy. Epistoma not pro- 

 jecting, vibrissse a little above oral margin. Two strong verticals in 

 female. Pair of strong reclinate ocellars. Lower border of head 

 quite equalling the frontal length. Frontalia rather broad, occupying 

 one third of frontal width in female. First three abdominal segments 

 with marginal row of bristles, but the median marginal pair is dif- 

 ferentiated from the rest in each case by being erect. Fourth seg- 

 ment with only fine hairs. Hairs of abdomen short. Femora thick- 

 ened. Petiole of apical cell a little shorter than the hind crossvein. 



Cyclodionaea acuminata new species. 



Length of body, 5 to 5.5 mm.; of wing, 3 to 3.5 mm. Two females, Santa 

 Clara county, California (Baker); and Piano, Texas, October (E. S. Tucker). 



Black. Head silvery-white pollinose, epistoma yellowish, frontalia dark 

 brown or black, antennae blackish. Palpi fulvous. Thorax and scutellum 

 shining, thinly silvery-white pollinose. Abdomen shining brown to blackish, 

 not pollinose. Legs black. Wings clear. Tegulae white. 



Holotype, No. 19578 U. S. N. M., California. 



MICROSCIASMA new genus 



Genotype, Microsciasma minuta Townsend new species. 



Differs from Sciasma Coquillett as follows: Vibrissal angles and 

 oral margin on line with lower border of eyes, frontalia of male 

 scarcely at all narrowed, arista shorter. Male abdomen subrounded 

 in outline from above, but slightly longer than broad, arched, macro- 

 chaetas vestigial. Male claws much shorter than last tarsal joint. 



Microsciasma minuta new species. 



Length of body, 2 mm.; of wing, nearly 1.75 mm. One male. Grand 

 Canyon, Arizona, near Colorado River on Hance Trail, about 3,500 ft., July 

 10, 1892 (Townsend). 



Black, antennae and palpi pale reddish-yellowish, frontalia reddish-brown. 

 Mesoscutum, scutellum and abdomen polished, with slight greenish metallic 

 lustre. Pleurae polished brown. Femora brownish yellow, tibiae and tarsi red- 

 dish-brown. Wings faintly yellowish-fuscous on costal third, tegulae deeply 

 yellowish-fuscous. Face, cheeks and parafrontals deep black, occiput shining 

 black. 



Holotype, No. 19579 U. S. N. M. 



This is the smallest muscoid fly known to me. 



