219 



[March, 



GG. Abdomen without central spines upon the edge of the second sef^ment. 



a. Abdomen tessellated in the ordinaiy manner. Posterior tibiae of S clothed with 



short soft hairs. 



11. Adolescens, Rond. 



aa. Abdomen with a black central dorsal line, and lateral spots upon the posterior 



margins of the segments. Posterior tibiae of cJ bare. 



12. Affinis, Fall. 



BB. Wings with spines upon the second longitudinal veins. 



a. Abdomen tessellated in the ordinary manner. 



13. Setipennis, Roud. 



aa. Abdomen with the spots or patches arranged in lines. 

 f). Eyes near together. 



bb. Eyes wide apart. 



14. DissiMiLis, Meig. 

 15. Infantula, Rond. 



A A. Apex of abdomen red in both sexes. 



I. Wings with the second longitudinal veins unarmed. 

 J. Posterior tibine of 6 bearded upon their inner sides. 



K. Abdomen with two central spines upon the edge of the second segment. 



16. H^MOKRHOIDALIS, Zett. 



KK. Second abdominal segment without central spines. 



a. Black frontal stripe wider than the interval between the stripe and the eye on 



each side. 



17. NuKUS, Rond. 



aa. Frontal stripe equal in width to the space between it and the eye. 



18. Cruentata, Meig. 



JJ. Posterior tibia; of <J bare. 



19. H^MATODES, Meig. 



II. Wings with spines upon the second as well as the foiirth longitudinal veins. 



20. H^MOEEHOA, Meig. 



1. Caenaria, Lin., Meig., Macq., Zett., Walk., Scliiner, Eond. 



striata ? Meig., Macq., Walk., Zett., Sch. 



ccerulescens ? Zett., Rond. 

 TelloTvish or whitish-grey, striped and tessellated with black. 

 Posterior tibiae of ^ with long and thick beard ; middle tibiae also 

 more or less bearded. Four bristles in the dorsal thoracic row behind 

 the transverse suture, and two central spines on the margin of the 

 second abdominal segment. Length, 4 — 8 lines.* 



Head : forehead and face prominent, the latter varying in colour from pale golden-3'ellow 

 to pure white, with dark grey reflections when viewed laterallj'. Frontal space from one- 

 fourth to one-fifth of the width of the head in breadth in <J, and about one-third in ?. 

 Frontal stripe black. Setaj upon the cheeks very small. Arista with longish hairs. 



Thorax and Scutelltim grey. Three broad black stripes extend the whole ength of the 

 back, and are continued more or less distinctli' over the scutellum ; two irregular or broken 

 stripes are also placed on each side. Ten or twelve bristles are arranged upon the sides in 

 two or three irregular rows, and six or seven others in a line upon each of the two lateral 

 broad stripes upon the dorsum, four of which are always placed behind the transverse suture 

 and two or three before it. Of the posterior ones the two hindmost are the largest, then 

 comes a small one which is sometimes obsolete, and in front of this a stronger one, though 



• By •» line. I mean oiie-twelftli of an inch, or slightly more than two millimfctres. — R. H. M. 



