327 



men is in the collection of the Philadelphia Academy of Natural 

 Sciences. 



3. Heteromyia plkbeia Loew 



Ceralopogon plebius Loew, Berl. Ent. Zeitsehr., 1861, p. 313, sp. 11. 



Male. — Black, shining. Face and antenn?e brown, palpi yellow. 

 Abdomen yellow at base. Legs yellow, apices of fore and mid femora 

 narrowly, of hind femora broadly, blackened; apical 2-3 joints of 

 tarsi brown. Wings clear, veins pale brown. Halteres pale yellow. 



Eyes narrowly separated ; antenna more than one and a half times 

 as long as head and thorax combined. Disc of mesonotum with nu- 

 merous short blackish hairs ; a few setulae on margins in front of wing- 

 base, and on margin of scutellum. Hypopygium smaller than usual in 

 this family. Fore femora much swollen, the thorns beginning just be- 

 fore middle and reaching to apex; fifth tarsal joint unspined ; tarsal 

 claws small, equal, without distinguishable middle tooth. Third vein to 

 slightlv less than three fourths the wing-length ; first ends at middle of 

 third, its last section distinctly shorter than penultimate section of 

 third ; media forking before cross vein, its posterior branch with base 

 indistinct ; cubitus forking slightly beyond cross vein. 



Female. — Differs from the male in having the head yellow, the an- 

 tenna? with only the flagellum brown ; the abdomen more broadly yel- 

 low at base, and the legs with the dark marks less distinct. 



The antennal flagellum is very slender, and the entire antenna! 

 length is about three fourths that of the insect itself. The tarsal claws 

 are longer than in the male, and have the central tooth distinct. The 

 third vein extends to four fifths of the wing-length. In other respects 

 as the male. 



Length: male, 1.75-2.5 mm.; female, 2.5-3 ^^• 



Localities: Monticello, 111., June 28, 1914, swept from vegetation 

 on bank of Sangamon River; Little Bear Lake, Columbia. Mich., July 

 15, 1914, swept from vegetation; Ithaca. N. Y. (O. A. Johannsen). 



Originally described from Pennsylvania. 



Early stages unknown. 



4. Heteromyia cressoni, n. sp. 



Female. — Head yellow, vertex and flagellum of antennre fuscous.. 

 Thorax brownish black, shining, anterior lateral angles yellowish; 

 pleurae highly polished. Abdomen yellow. Legs yellow, coxae brown- 

 ish ; tarsal claws black. Wings clear, veins yellowish. Halteres yel- 

 low. Knob pale brow^n. 



Frons narrow anteriorly, the sides diverging posteriorly ; antennae 

 with the basal nine joints of flagellum distinctly longer than their 



