Anthomyid genera Hammomyia anil Hylephila. 313 



10. (1) Middle tibiae without a bristle beneath. 



11. (16) Pre-alar bristle present even if short. 



12. (15) Hind-margin of sixth abdominal segment with long strong 



curved bristles, which are bent down over the end of 

 abdomen when the ovipositor is withdrawn. 



13. (14) Arista practically bare. Abdominal stripe more distinct. 



Pi'osternal plate usually quite bare. 6. brevifrons Stein. 



14. (13) Arista iDubcscent. Abdominal stripe narrower. Prosternal 



plate with a pair of strong bristles. . 7. buccata Fin. 



15. (12) Sixth abdominal segment with no remarkable curved 



bristles. Frons wider (about J the width of head). 

 Postical cross- vein oblique and somewhat sinuate. 



8. sponsa Meig. 



16. (11) Pre-alar bristle absent 9. c/orsaiis Stein. 



1. Hy. unilineata Zetterstedt, Ins. Lapp. G75 (1838); 

 D. Scand. iv, 1518 (1845). 



Resembling the next two species, but greyer and easily 

 distinguished by having the bristle beneath middle tibiae 

 smaller and placed more anteroventrally. 



(^. Head very much as in obiusa. Thorax greyer, with a faint 

 brownish central stripe continued over scutellum and an indistinct 

 biownish stripe on each side; viewed from behind the thorax 

 appears darker grey but not so dark as in obiusa. Acrostichals long 

 but fine, the other fine hairs on thorax and scutellum (as distinct 

 from bristles) less numerous than in obtiisa. Pie-alar bristle distinct 

 but hardly haU the length of supra-alar bristle. Abdomen grey 

 but distinctly tessellated with shifting dark tessellations and a 

 central dark stripe; conspicuously pilose and with strong hind- 

 marginal bristles. The genitalia are quite distinctive; the end of 

 the penis showing some approach to the remarkable development in 

 dissimilis, while the narrow side-lamellae more resemble those of 

 sponsa. 



Legs as in obtiisa with the femora more pilose than setose, esjDeci- 

 ally the middle femora with rather dense fringes of long fine bristly 

 hairs posteroventraUy. On middle tibiae the antero- and postero- 

 dorsal spines at apical third are stronger than in obtvsa, while the 

 strong absolutely ventral bristle of obtusa is represented by a 

 shoi'ter, distinctly more anteroventi-al bristle. Hind legs, wings, 

 etc., very much as in obtusa. 



$. Distinguished at once by the wide frons — almost as wide as in 

 sponsa — and the short antero ventral bristle to middle tibiae. Width 



