it-. 



44 Families and (iIenera of 



^iilnplc witli a terminal or dorsal arista. Proboscis short and stout. 

 Ilypopygiuin of male usually infloctod under the abdomen, and com- 

 posed of two consecutive parts, bearinjj at the end eight paired and 

 two single appendages. The auxiliary vein terminates in the first 

 longitudinal vein ; third longitudinal vein not furcate ; second basal 

 cell imited with the discal cell ; anal cell small ; three posterior 

 cells. Legs more or less bristly, in the male usually with struc- 

 tural differences; empodia not develo])ed pulvilliform. 



Larvse found in tlie ground, or in decaying vegetable matter. 

 Pupaj free. 



I. First antennal joint hairy above.^ 2 



^r. First antennal ioint glabrous al)ove. 1(5 



f^j, '^- Hypopygium disengaged 3 



Hypopygium more or less imbedded 14 



Hr— First joint of the hind tarsi bristly 4 



First joint of tlie liind tarsi not bristly 5 



4. P'ace descending as far as the inferior angle of the eye. 



IIygrocki.euthus 

 Face not descending as far as the inferior angle of the eye. 



^ HOLII IIOl'US 



•"). ]-'alpi of the male unusually large Diostracis 



Palpi of the male small. () 



(). The last portion of the fourtli longitudinal vein is parallel, or al- 

 most so, to the third longitudinal vein. . (lYM.xoi'TicRxrs 

 The last portion of the fourth longitudinal vein is distinctly con- 

 vergent towards the third longitudinal vein. ... 7 

 7. The end of the foui'th longitudinal vein is abrui)tly, or at least 



steeply deflected anteriorly 8 



The end of the fourth longitudinal vein is only gradually deflect- 

 ed anteriorly ' 9 



H. Arista with the usual ])ubescence; the end of the fourth longitu- 

 dinal vein, beyond the angular He.xure, runs in curve. 



Paraci.ius 

 Arista short-plumose; tlie end of the fourth longitudinal vein, 

 beyon<l tlu^ rounded tle.xure, runs in a straight line. 



PiCLASTONEI HIS 



II. Tlie face reaches down to the inferior coriK'r of the eye. 



'I'a( HYTKE( IIUS 



The fact' does not re<u-h down to the inferior curner of the eve. lt> 



