404 TABANID.E 



nise as T. trojncns L., and tliat T. troj)icus of Fabricius (of wliicli he gave 

 T. sanguisorha Harris as a synonym) is our T. solstitialis or T. distinguendus. 

 The opportunity may be taken here of trying to fix the date of Harris' Exposition 

 of English Insects. It is certain that one edition was prior to Fabricius' Species 

 Insectorum (1781), and it is also certain that there could not have been any edition 

 prior to 1780 because Plate xxvi. of the coj^y of the first edition in the British 

 Museum bears the date of 1780 ; the date may therefore be taken as 1780 or early in 

 1781. I believe all the supposed three editions have identical plates, and in my 

 copy (which bears the date of 1782) I find on Plate iii. " Mos. Harris ad Vivum, May 1 , 

 " 1766," on Plate xxii. "Mos. Harris Delt. et Sculpt. Dec. 24, 1779," on Plate xxiii. 

 "Mos. Harris Dellt. et Sculpt., Dec. 1779" (in very different writing from that on 

 Plate xxii.), on Plate xxv. "Mos. Harris, 1780," and on Plate xxvi. " Mos. Harris, 

 " Dell, et Sculpt., 1780." If the date of publication be taken as 1781 it still holds 

 priority over the second volume of Fabricius' Species Insectorum as is proved by 

 Fabricius referring to it in that work. 



13. T. glaucus Meigen. Allied to T. hromius but larger, and with 

 the abdomen almost as rufescent as in T. tcrgestinus. 



An unsatisfactory species, which may be only a very dis- 

 tinct looking variety of T. hromius. 



S . Head possibly slightly shorter and broader than in T. hromius. Face with a 

 more fulvous tinge ; side-cheeks more extensively black haired on the upper 

 part ; vertex almost exactly as in T. hromius, as there is a clump of short pale 

 yellow hairs on the vertical triangle which somewhat contrast Avith the rather 

 shorter tawnier postocular ciliation in the depression which slopes down to 

 the vertex. Eye-facets almost as in T. hromius, the upper and front facets 

 being quite four times as large as the lower ones and sharply contrasted ; 

 colour of the eyes in life not noted. Antennae with the basal segment of the 

 third joint rather long and thin, and the hump small and placed before its 

 middle, and (in the specimen described) with its dull reddish colour merging 

 into the dark brown style. 



Thorax and scutellum as in T. hromius. 



Abdomen longer and narrower, conspicuously dull reddish on the side 

 thirds of the second and third segments and on two spots on the fourth 

 segment and also narrowly on the side thirds of the hindmargin of the basal 

 segment ; second segment with a small blackish discoloration near each 

 hind corner, and the third segment with this still more marked ; sidemargins 

 of the fifth and sixth segments rather narrowly reddish ; fourth, fifth, and 

 sixth segments with scarcely any trace (rubbed 1) of grey side-flecks or dorsal 

 triangles and consequently the broad blackish dorsal stripe on the abdomen 

 more conspicuous. Belly conspicuously dull reddish on the three basal 

 segments except that the sides are narrowly blackish and that there is a 

 rather broad but rather vague blackish middle stripe. 



Legs with rather more blackish pubescence about the tip of the front 

 femora. 



Squamae (thoracal) with rather darker margins. 



$ . Head shorter than in T. hromiiis ; frontal stripe with the lower callus rather 

 larger and squarer ; postocular eyemargin rather wider, and (in one specimen) 

 with a front fringe of tolerably long and distinct black hairs (can this 

 specimen be true T. Mikii ?). Palpi less stout soon after the base of the 

 second joint and with the black bristles not quite extending to the base. Eyes 

 not noted in life. Antenufe reddish brown, or (in the second specimen) more 

 reddish on the basal half. 



Abdomen with consjiicuous dull reddish coloring on the three basal 

 segments, but with a pair of brownish diagonal stripes on the second and 

 third segments outside the reddish flecks and not nearly reaching the side or 

 hindmargin, and these stripes bear black pubescence which contrasts strongly 

 with the pale pubescence which occurs on the reddish part; the reddish 



