2G4< [April, 1876. 



12. Affinis, Fall, Meig., Macq., Zett. 



Whitisli-grey, with black lines and spots. Frontal space narrow. 

 Abdomen marked by a single longitudinal line, and with black spots 

 on the posterior margins of the segments. Length, 3| — 4 lines. 



Seads : eyes of S near together, being separated by a very uarrow frontal space, which 

 is often of a reddish-brown colour. Style with rather short hairs. 



Thorax striped in the ordinary manner, and with three posterior dorsal bristles. 



Abdomen without central spines on second segment. First segnient black, second, third 

 and fourth grey, marked with a central black longitudinal line, rather irregular in width, 

 and sometimes interrupted at the sutures, and with six large, black, somewhat triangular 

 shaped spots, one of which is placed at the side of the posterior margin of each segment. 

 Anal segments of tJ small and grey in colour. Wings with no costal spine. Internal trans- 

 verse vein nearly opposite the end of the second longitudinal, which extends considerably 

 beyond it in most species. Legs with posterior tibiss of <J bare. 



? similar to <J , but with the frontal space as wide as one-fourth of the head. 



Not rare. 



13. Setipennis, Rond. 



Tellowish-grey, striped and tessellated in the ordinary manner. 

 Second as well as fourth longitudinal vein of wings armed with teeth. 

 Costal spine large. Second abdominal segment with central spines. 



Length, 3 — 3| lines. 



Sead : frontal space of ? as wide as one-third of the head. Style with long hairs, 

 bristles upon the cheeks a little enlarged. 



Thorax with three dorsal bristles behind the suture. 



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

 the ordinary manner. Wings : second longitudinal vein armed with teeth along nearly its 

 whole length. Fourth vein with teeth at the base as in all other species. Costal spine 

 large. 



Rare. I have not seen a ,^ of this species, and only three ? , one 

 of which is in Mr. Verrall's collection, taken at Ranscombe, one is in 

 my own collection, and I received one from the late Mr. F. Walker. 



1-i. DissiMiLis, Meig., Schin. 



Grey. Abdomen of (J marked with three longitudinal black lines. 

 Abdomen of ? shining black, with small white spots upon the sides. 

 Frontal space narrow. "Wings tinged with brown, and with the second 

 longitudinal vein dcntigcrous. Posterior tibiae of ^ with a few long 

 scattered hairs. Length, 2 — 3 lines. 



Sead : frontal space occupying about one-sixth of the width of the head in <J, and one- 

 fourth in the §. Bristles of cheeks of ordinary size. 



Thorax marked in the usual manner, and having three posterior dorsal spines. 



Abdomen narrow in 6 , with two central spines upon second segment. First segment 

 shining black, the three following ones grey, marked with three longitudinal black lines, 

 formed by a series of triaughs, the bases of which are placed backwards. Anal segments 



