424 TABANID^ 



2 (3) Legs entirely black (unless just the base of the tibise be obscurely 



fulvous). 1 ccemtiens. 



3 (2) Legs brownish yellow on the posterior (or at least middle) tibiae. 



4 (5) Second abdominal segment orange, with an almost isolated small 



black spot in the female (fig. 246), or with a large subquadrate 

 middle black blotch in the male. Hind tibise of the male 

 black. 2 quadrat a. 



5 (4) Second abdominal segment orange, with a black blotch composed 



of two blunt-ended triangles which touch on the foremargin 

 but which are directed backwards and outwards in the female 

 (fig. 248), or with these triangles bluntly ended against the 

 hindmargin and the third (and often the fourth) segment with 

 a wider and less distinct double blotch in the male. Posterior 

 tibiae brownish yellow in both sexes. 3 relicta. 



6 (1) Abdomen and legs entirely black. Wings with the outer margin 



Fig. 2i0. —Chrysops sepulcralis S- x 9- 



of the middle dark band somewhat concave (fig. 240).* Face 

 almost wholly shining black except on a narrow middle line. 



4 sepulcralis. 



Pandelle was of opinion that these four perfectly distinct species are all varieties 

 of one species ! 



1. C. caecutiens Linne. Legs almost entirely black. Facial and 

 buccal calli separated. Abdomen of the male with a rather small luteous 

 spot on each side of the second segment, of the female with a complete 

 black fork on an orange ground colour. 



A handsome fly, with variegated wings. Closely allied to 

 the other species of the genus, 



$ . Face mainly covered by the shining black calli, the two facial calli leaving 

 a narrow intermediate yellowish stripe which widens out at its top just 

 under the antennae and which also usually widens out a little at its lower 

 end just above the mouth ; at the bottom part of each facial callus thei'e 

 is a deep pit, and beneath that a fairly large yellowish patch which 

 usually extends to the eyemargin and consequently separates the facial 

 and buccal calli, but the facial and oral calli are united on each side of 

 the middle yellow line ; buccal calli large and indistinctly connected 

 with the oral calli along the mouth-edge ; jowls below the buccal calli 

 greyish yellow and extending right across from the lower eye-angles to the 



* This character is hardly obvious in the male, but is more distinct in the female. 



