PSYCHE 



VOL. XXIX. APRIL 1922 No. 2 



MICROSANIA, A GENUS OF THE PLATYPEZIDAEi 



By a. L. Melander, 



Pullman, Wash. 



Microsania Zetterstedt, Isis, 1837, i. 30 [1837]; 



Ins. Lapp. 53-1, note [1838]; 

 Dipt. Sc. i. 333 [1842]; 

 Bigot, Ann. Soc. Ent. Fr. [6] ix. 123 [1889]; 

 Melander, VVilliston's 3d. Man. 225 [1908]; 

 Lundbeck, Dipt. Dan. Emp. iii. 18 [1910]; 

 Wahlgren, Ent. Tidskr. xxxi. 43, 47 [1910] 



Microcyrta Bigot. 



Bigot, Ann. Soc. Ent. Fr. [3] v. 557, 564 [1857;; Coquillett, Proc. 



Ent. Soc. Wash. v. 253 [1903]; 

 Pachypeza Lioy, not Serville, Coleoptera, 1835; Lioy, Atti. Inst. Veneto 



[3] ix. 723 [1863]; Coquillett, Proc. Ent. Soc. Wash. v. 255 [1903]. 

 Platytelma Rondani. 



Rondani, Dipt. Ital. Prodr. i. 138 [1856]; Coquillett, Proc. Ent. 

 Soc. Wash. V. 256, 261 [1903]. 



Small, hunchbacked species with open venation and infiexed 

 hypopj^gium. Head rather globular, eye^ bare, of the male 

 entirely contiguous above the antennse, the facets of the upper 

 two-thirds large, of the female broadly separated, the facets 

 uniform, the front of the female with one pair of vertical and two 

 pairs of orbital bristles, the lower pair converging, and a pair of 

 diverging supraantennal interfrontal bristles; face of the male 

 deeply concave, its sides divergent below, of the female strongl}^ 

 convex below, almost nasiform; proboscis fleshy, short, not 

 extending beyond the broad oral cavity, palpi \Qvy wide, disci- 

 form and appressed against the cheeks; occipital hairs sparse 

 but stiff; antennse short, basal joints small, the third joint 

 orbicular, with a terminal tapering arista at whose base are 

 two minute segments. Chaetotaxj' of the thorax as follows: 

 one humeral, two or more posthumeral, four to six notopleural 



ijoint contribution from tlie Bussey Institution of Harvard University No. 150, and the 

 Zoology Laboratory of the State College of Washington. 



