1. H.EMATOPOTA 341 



early as May 24. It was first described by Walilberg from Scandinavia 

 and has since been found (though rarely) in Central Europe, but has not 

 been well recognised ; I saw some strange forms of French Hcematopota 

 in the Museum at the Jardin des Plantes, but none answering to our 

 H. crassicornis. 



Synonymy. — Duncan obviously took this species at Rannocli in July 1825, and 

 said it was the same as Curtis //. hirsuta, though Curtis liimself stated in 1834 

 that his //. hirsuta was only the male of //. p^uvialis ; under any circumstances 

 H. hirsuta is only a ''nmien midum." The characters by which Osten Sacken 

 distinguished the North American IT. americana seem to exactly agree with 

 H. crassicornis. 



3. H. italica Meigen. Third antennal joint partly reddish ; basal joint 

 elongate and entirely dull in the female. Wings rather washed out 

 marmorate. Pubescence behind the vertex wholly tawny in the male. 

 Femora of the female often obscurely ochreous. 



Closely allied to the other species, but easily distinguished 

 in the female by the elongate entirely dull basal joint of the 

 antennge. 



^. Head in profile more evenly rounded anteriorly than in the other species, 

 being less produced upwards towards the vertex ; cheeks, jowls, and 

 postociilar rim whitish grey, except for the usual black spots on the side- 

 cheeks ; postocular ciliation long and black on the upper third of the eyes 

 and standing out conspicuously, but between the eyes on the slightly pufted-out 

 vertical space the jmbescence is soft and thin and rather dense and forms a 

 rather conspicuous pa/e tawny tuft ; the puffed-out vertical space is slightly 

 larger than in the other species and is whitish ashy grey with a conspicuously 

 more yellow tinge when seen from above. Palpi dull pale orange in one 

 specimen but in another specimen with a blackish tinge, and bearing rather 

 long but not dense pale orange and black hairs. Eyes in profile nearly as long 

 as deep, rounded below, and bearing dense pale grey pubescence which has a 

 slight brownish tinge on the front part, and which is distinctly longer than in 

 H. pluvialis or //. crassicornis ; facets on the upper two-thirds considerably 

 enlarged, and the rather distinct dividing line sloping downward from the 

 front part of the eye but curving up again towards the hindmargin and leaving 

 a less defined zone of small facets which dies out soon after the middle of the 

 hindmargin. Antennae longer than the head • basal joint not quite twice as 

 long as stout, shining black but with whitish grey dust on the dorsal basal 

 half (much more conspicuous than in H. c7-assicornis but less so than in H. 

 ■phivialis) and on the inner underside almost up to the tip, and bearing conspicu- 

 ous long pale brownish yellow hairs (much more dense than in the other species) 

 intermingled with which (especially near the tip) are a few inconspicuous 

 black hairs ; second joint very short and with the usual circlet of short black 

 bristles ; third joint with its basal segment brownish orange but apparently 

 divided into a short and a long articulation, and with a few tiny black bristles 

 abour, the end of the basal annulation ; this entire basal segment of the third 

 antennal joint is only a little swollen about its middle and is longer than the 

 other segments together, and these other segments are narrower and form a 

 thick dull blackish brown style ; third antennal joint (including all its 

 segments or annulations) very little longer than the basal joint. 



Thorax dull dark greyish brown or almost black with three light grey 

 stripes, of which the middle one is very narrow but extends from the front 

 almost back to the hindmargin, but the side ones are interrupted at the 

 suture and only reappear as wider somewhat triangular rather conspicuous 



