2. TABANUS 351 



on the eyes of some true Tdbani, but from Atylotus it is not so easily 

 distinguished. In our British species however Atylotus may be known by 

 the large head of the male, the entire absence of any ocelli or even ocelli- 

 gerous tubercle, the recurrent veinlet from near the base of the upper fork 

 of the cubital vein (fig. 215), and the shifting irregular spots on the eyes 

 in life. 



TaUe of Species. 

 Males. 



1 (2) Legs entirely black. Frontal triangle shining black. 1 micans. 



2 (1) Tibiffi mainly yellowish. Frontal tria,ngle grey. 



3 (8) Abdomen mainly blackish grey or black, with only moderate dull 



reddish or brownish red lateral markings near the base. Eyes 

 in life with three purplish bands. 



4 (5) Vertex with a tuft of black hairs behind the ocelli. Eather large 



species. Middle tibiee conspicuously pubescent; eyes touching 

 for a long space. 2 tropicus. 



5 (4) Vertex without any tuft of black hairs behind the ocelli. Smaller 



species. 



6 (7) Wings without clouds on any cross-veins. Eyes touching for 



a long distance, and bearing short pale pubescence. Last joint 

 of palpi long and pointed. Antennae usually mainly reddish. 

 Middle tibiae only moderately pubescent. Abdomen indistinctly 

 shining. 3 montanus. 



7 (6) Wings with clouded cross-veins. Eyes actually touching for a 



comparatively short distance, and bearing long dark pubescence. 

 Last joint of palpi broad and stout. Autennse mainly blackish 

 brown. Middle tibiae with long and abundant pubescence. 

 Head flattened. Abdomen conspicuously shining. 4 luridus. 



8 (3) Abdomen mainly bright brownish or reddish orange with a black 



dorsal stripe. Eyes in life with two purplish bands. 



9 (10) Eye-facets only moderately enlarged on the front and upper parts, 



and not sharply contrasted with the smaller lower ones. Eyes 

 with rather short brown pubescence. 5 dlslingucndus. 



10 (9) Eye-facets very much enlarged on the front and upper parts, and 

 sharply contrasted with the smaller lower ones. Eyes with 

 long pale pubescence. 6 solstitialis. 



Females. 



1 (2) Legs entirely black. Frontal triangle shining black. 1 micans. 



2 (1) Tibiae mainly yellowish. 



3 (8) Abdomen mainly blackish grey or black, with light flecks, and 



with only moderate (if any) dull reddish or brownish red 

 lateral markings near the base. 



4 (7) Frontal triangle grey. 



