30 SYRPIUD^. 



17. Abdomen short ovate, considerably 



broader than the tra.nsverse thorax . . Eriozona, Sch., p. 103. 



Abdomen like that of Si/rphus\ thorax [p. 65. 



not transverse Ischyrosyrphus, Big., 



18. Alulfe of normal size 19. 



Alulfe extremely small ; eyes in J sepa- 

 rate : 20. 



19. Epistome produced into a distinct snout ; 



eyes in J contiguous Ehingia, Scop., p. 129. 



Epistome not snout-like ; eyes in (5 dis- 

 tinctly though rather narrovrly sepa- [de Meij.,p. 111. 



rated" Spheginobaccha, 



20. Apical section of 4th vein not recurrent ; [p. 127. 



hind femora not thickened or spinose . Rhinobaccha, de Meij., 

 Apical section of 4tli vein recurrent; 

 hind femora tliickened and spinose . . 21. 



21. Face deeply hollowed below antennte ; 



npical section of 4th vein rounded at 



the angle Sphegina, Meig., p. 106. 



Face only slightly hollowed below an- 

 tennje ; flexure of 4th vein almost 

 rectangular . . : Ascia, Meig., p. 105, 



Genus PARAGUS, Latr. 



Parayus, Latreille, Hist. Nat. Crust. Ins. xiv, p. 359 (1804). 



Genotype, Mulio hicolor, Fabr. ; by original designation. 



Head rather flattened, broader tban thorax ; face not cut away 

 below antennae, but produced towards a large central bump. Eyes 

 pilose, contiguous in rj' ; antennse nearly porreet, rather long, 

 3rd joint usually longer tban 1st and 2nd together; arista dorsal. 



la \ 



Fig. 8. — Paragus lutcus, Brun. 



Thorax quadrate, arched, with soft pubescence ; scutellum rather 

 larc'-e, unspined except in P. serratns, Fabr. Ahdomen as wide as 

 thcTrax, usually linear, with a shallow transverse depression on 

 each of the segments, the latter about subequal in length. Legs 

 simple, moderately slender. Wings with normal venation except 



