Tabanidae. 105 



wanting, and tlie design more distinct, as a rule beginning on the 

 second segment, sometimes brownish but varying to whitish grey. 

 Legs sometimes with the femora more or less yellowish. 



Length 7,5—11 mm. 



The lenglh of the pupa is 13 — 14.5 mm. 



H. pluvialis is rather common here, and may on hot days be 

 very objectionable by its repeatedly attacicing; especialiy it always 

 occurs on sun-lit roads in woods. It occurs in all Denmaric just from 

 Sitagen to the southernniost parts, and is also taken on Læsø and 

 Bornholm ; it has been taken from •'/s to "k. The pupæ have been 

 found in moist sand in Lyngby Mose, at Furesø and at Nyraad near 

 Vordingborg; a pupa taken '■'/.■, developed --'/o, others developed -'/« 

 and */7 to '^l-j. 



Geographica! distribution: — The species is distributed over the 

 whole of Europe, and in northern Africa. 



±. H. crassicornis VVahlberg. 



1848. Wahlberg, Ofvers. K. Sv. Vel. Akad. Forh. V, 200. — 1903. 

 Kat. palaarkt. Dipt. II, 54. 



This species to a high degree resembles pluvialis, so that I shall 

 only compare it with the latter and give the differences. 



Male. The erect hairs on the vertex and the upper eye-margin 

 moderately long, shorter than in pluvialis, pale yellowish, only on 

 the sides they may be darker. First joint of the antennæ very thick, 

 short ovate, shining black, only with a grey pruinose spot at the 

 base towards the inner side. Thorax witli the inner lateral stripes 

 abrupted a little l)ehind the middle, as a rule ending in a triangular 

 spot, and a similar spot at the hind margin. Reddisii markings on 

 abdomen small or almost wanting. 



Female. The black shining band above the antennæ narrower 

 than in pluvialis, not, or almost not, produced in the middle. First 

 joint of antennæ considerably thicker than in pluvialis, not constricted 

 at the apex, greyish pruinose only at the base, sometimes to the middle. 



Lenght 7,5 — 10 mm. 



This species much resembles pluvialis, but I think it is distinct. 

 The character most to be relied upon is the shape of the tirst antennal 

 joint in both sexes, and the mainly pale hairs on the vertex in the 

 male. The shape of the shining band above the antennæ in the 

 female, and the pattern of thorax are helping characters, but they 

 are not absolutely to be relied upon. In my specimens the third 

 antennal joint in both sexes is more or less yellowish at the base, 

 sometimes in the whole lenght, only with the style dark. 



