324 



EMPIByE. 



The E.N[PiD.Ti ma}^ be distiiigiiished from the Asilid^e by tlie 

 difference in A'cnation, non-excavation of the vertex, smaller 

 head, and absence of long hair on the lower part of the head. 

 Prom the ~DohicuoFoniD7E. to which certain genera bear some 

 resemblance, they may be known by the venation. A few genera 

 with reduced venation may have a superficial resemblance to some- 

 AcALYPTiiATA, but the family characlers described above will 

 separate them. The subfamilies are not so easily distinguished 

 as in some other families, and, as a rule, more than one character 

 has to be taken into consideration in separating them. 



Tahle of Siihfamilles. 



Anal cell absent, or, if ])resent, anal 



vein incomplete and middle femor,), 



usually incrassate ; anterior cross- 

 vein nearly always beyond nnddle of 



discal cell , TACUYDitoMiiN.E, p. 373. 



Anal cell present, rarely absent, in Avhich 



case fore coxa3 much elongated, about 



as long as the incrassate fore femora ; 



anterior cross-vein always much 



before middle of discal cell (except 



ill Henierodronna spp.) 2. 



.Axillary lobe of wing oreatly reduced or 



absent; wing cuneiform at base ; fore 



coxas much elongated, about as long 



as fore femora, alwaj's longer than 



posterior coxae Hemkrodromiin.e, p. 3G5.. 



Axillary lobe of wing generally nor- 

 mally developed or conspicuous ; 



Aving not cuneiform ; fore coxt"© 



always shorter than fore femora .... 3. 

 Anal cell always distinctly longer than 



2nd basal cell ; lower branch of oth 



Aein bent down to meet anal vein 



always at an obvious obtuse angle, 



and approximately perpendicular to 



bind margin of wing ; posterior 



margin of anal cell always the longer, 



its apical end never truncate ; pro- 

 boscis shorter tlian height of head ; if 



longer, directed straight or obliquely 



forwards aud also antenna) and style 



very short ; 3rd vein always simple ; 



thorax generally conspicuously hum- 

 ped HvBOTiN.^, p. 825. 



Anal cell shorter than, or at most 



approximately subequal to 2nd basal 



cell ; lower bi'anch of 5th vein bent 



down to meet aual vein at an acute 



angle, a right angle or at most only 



slightly obtuse angle ; approximately 



either perpendicular to, parallel with. 



