318 



Eyes distinctly separated alcove; antennae extending to beyond 

 middle of abdomen. Hypopygium small, recurved, apical portion of 

 lateral arm short and stout. Legs slender; fifth tarsal joint of 

 hind legs with 2-3 pairs of ventral thorns, the other legs unarmed ; 

 tarsal claws short, subequal, with short basal tooth. Third vein end- 

 ing at about four fifths the wing length, first slightly before middle of 

 third. 



Length, 2.5 mm. 



Locality, White Heath, 111., May 30, and July 11, 1915, on bank 

 of Sangamon River (J. R. Malloch). I have also taken females of 

 this species at White Heath June 26 and July 11, and Mr. Hart took 

 it at St. Joseph June 27, 191 5, neither of these localities being included 

 in my previous paper. 



The male of this species was unknown when I wrote my paper on 

 the family, and this is the first published description of that sex. In 

 my key to the genus it will run down to section 13 ; and from both the 

 species contained therein it may be separated b}^ the long antennae and 

 by its having only the hind tarsi with the fifth joint spined ventrally. 



Probkzzia paluda Malloch 



Male. — Head brownish, eyes black, antenn?e yellowish, plumes 

 pale yellow, mouth parts almost white. Thorax varying from dark 

 brown to deep black, shining. Abdomen white, apical half black or 

 brown, hypopygium yellow. Legs almost white, last tarsal joint black. 

 Wings white, veins pale 3^ellow. Halteres yellow. 



Eyes separated above ; antenna longer than head and thorax com- 

 bined. Mesonotum with four longitudinal rows of rather strong up- 

 right setulose hairs. Hypopygium rather large, not recurved, apical 

 portion of lateral arm shorter than basal, strong and stout, clawlike. 

 Legs of normal strength; fifth tarsal joint unarmed; claws small, sub- 

 equal, simple. Third vein ending about four fifths from base of wing, 

 first slightly before middle of third. 



Length, 1.5 mm. 



Locality, White Heath, 111., May g and 16, 191 5 (J. R. Malloch). 

 A large series of this sex was taken on the under side of leaves of 

 bushes and trees on the bank of the Sangamon River on the last- 

 named date. The day was very windy, and the insects were resting on 

 the sheltered side of the plants. I took two females also at White 

 Heath on May 16, one of them from a spider's web; it was still alive 

 when taken. 



The male of pallida will run down to section 10 in my key to the 

 species of this genus. It may be separated from all the species therein 



