438 TABANID.E 



specimens to a large extent on the anterior corners of the second segment, on 

 triangles at the middle of the hindmargins of the second and third seginents, 

 and rather sparsely on most of the fourth, fifth, and sixth segments except at 

 the base of the fourth, while the pubescence on the sidemargins of the two or 

 three basal segments is rather longer and is more distinctly tawny or grey. 

 Belly dull black with the hindmargins of segments narrowly broAvnish yellow, 

 and with brownish yellow [or grey pubescence which forms hindmarginal 

 fringes to all the segments or is sometimes more extended on to the disc of 

 the third and subsequent segments. Ovipositor showing two short blackish 

 yellow lamellae. 



Legs almost as in the male, but the pubescence on the coxae and usually to 

 a large extent on the posterior femora brownish yellow and rather more 

 sparse ; ciliation on the hind tibiae less conspicuous. 



Wings much more hyaline than in the male, as practically only the fore- 

 margin and a broad middle cross-band are blackish ; the darkened f oremargin 

 extended to the tip of the wing (just into the cubital fork-cell) but becoming 

 rather washed out about its end ; the upper basal cell all blackened except 

 on the hyaline space near its tip, and tlie second basal cell all hyaline 

 except at just its base ; the outer margin of the blackened middle band 

 almost as in the male but more sharply defined at its lower outer corner 

 and on the basal third of the postical fork-cell, and a broad darkened 

 margin occurs against the lower branch of the postical vein ; anal cell some- 

 times rather widely open or sometimes closed at the wingmargin. Squamae 

 (alar) rather small, smoky blackish with black margins and fringed with 

 coarse black scales ; thoracal pair large and bearing a minute fine greyish 

 black fringe except for a few scales near the angle. 



Length about 7-5 mm. 



This species shows little variation in a number of specimens 

 (2c?7?) from Studland Heath, and one female from Parley Heath, in 

 Dorsetshire, from which the above description has been made, but 

 one female has the second veinlet from the discal cell extending in both 

 wings only about half-way to the wingmargin and also has the radial 

 vein incomplete. Six females taken by Mr William Evans in a marshy 

 spot at Aberfoyle in Perthshire on June 30, 1905, have a very distinct 

 appearance, as they are rather larger and have a larger more ovate 

 abdomen upon which the tawny or rufescent pubescence is much more 

 conspicuous (being apparently longer) and never at all greyish either 

 dorsally or ventrally, while the pubescence is also more universally tawny 

 on all the face, frons, vertex, top of occiput, pleurse, and even on the 

 dorsopleural suture, except that one specimen shows traces of black 

 hairs against the dorsopleural suture. A male and a female in Kowarz's 

 collection from Dorpat in Livonia are evidently conspecific with the 

 Dorsetshire specimens, but the female has the pubescence much more 

 extensively black, as it has numerous black hairs scattered over the 

 disc of the thorax and a broader stripe of black pubescence along the 

 dorsopleural suture, and rusty black pubescence on each side of the stripe 

 and also on the mesopieural and metapleural tufts, while the abdomen has 

 black pubescence about the sides of the three basal segments and rusty 

 black pubescence on all the disc and on the belly ; the coxse and femora 

 have entirely blackish pubescence, and the wings are scarcely anywhere 

 truly hyaline unless on the hyaline portion of the basal cells and on the 

 spot in the submarginal cell, and the second basal cell has a yellowish 

 tinge along its lower margin, while each side of the anal vein is rather 

 widely darkened. The species may be distinguished from any other 

 European one (except C. maura, if that bo distinct) by its entirely black 



