i 



Aphiochaeta. 223 



middle; hind femora in male fringed with short 



hairs and last joint of front tarsi simple 72. diversa Wood. 



46. Bristles on hind tibiæ large; third abdominal 



tergite in f emale not abbreviated 73. variabilis Wood. 



— Bristles on hind tibiæ small; third abdominal 



tergite in female abbreviated (only female known) 74. tergata Lundbk. 



47. Palpi brown or blackish brown ; 1 not much longer 

 than 2; hypopygium with bristles (only male 



known) 75. fuscipalpis Lundbk. 



— Palpi dusky yellow, large, somewhat curved; 1 

 much longer than, nearly twice as long as 2; 



hypopygium without bristles 76. subpalpalis Lundbk. 



A. luteipes, belonging to the groiip with four sciitellar bristles, 

 but the male of which has only two, will be known from the species 

 in question of this groiip, viz liicijrons and suhnitida^ by the brownish 

 red antennæ, more or less yellow pleiira, and yellow venter. 



Group V. 



Scutellum with two bristles. 



Mesopleura bristly with the bristles uniform, all small. 



Costa short. 



1. Costal cilia short; balteres black 2. 



— Costal cilia long 5. 



2. 1 double 2 + 3 or more 3. 



— 1 not double 2 + 3 4. 



3. Abdomen banded, with whitish hind margins to 



the segments Verralli Wood. 



— Abdomen black, not banded fenestralis Schmitz. 



4. Supraantennal bristles unequal, the lower quite 

 minute; last joint of front tarsi dilated; hind 

 femora serrated with about four blunt teeth 



below near base (only male known) serrata Wood. 



— Supraantennal bristles equal; front tarsi a little 

 thickened, but last joint not dilated and hind 



femora simple 78. latifrons Wood. 



5. Halteres dark or black (in involuta sometimes 

 yellow, the species then may be known by the 

 thickened front tarsi in connection with the pro- 

 portions of the costal divisions) 6. 



— Halteres yellow IL 



6. 1 about double 2+3 or longer 7. 



— 1 not double 2+3, but distinctly shorter 8. 



7. Palpi black (rarely yellowish); front tarsi simple, 

 but hind tibiæ in the distal part and hind meta- 



tarsi thickened '. 79. pusilla Meig. 



