228 t October, 



darker wings, but gave no other distinctive characters. In 

 his description of the male he says nothing about the 

 darkened stripes on the femora, and he lays rather more 

 stress upon the sligma being somewhat swollen, but his figure 

 of the extraordinary lamellae of the male absolutely identifies 

 the species. 



40. D. simplex Meig. : not uncommon from Penzance to Tongue. 



Mik (Verb. z.-b. Wien, 1880, p. 594) professed to distinguish 

 Haliday's D. thalassinus which he considered the same as D. 

 fallaciosus of Gerstaecker, but 1 am unable to follow his dis- 

 tinctions ; our British specimens almost always have a pale 

 yellow face and a completely orange basal joint of the an- 

 tennae. I cannot understand Loew stating that the male of 

 this species has a long thin bristle at the tip of the front 

 tibiae as in D. latilimbatus. Bezzi includes both D. thalassi- 

 nus and D. fallaciosus as synonyms of D. simplex. 



41. D. ungulatus L. : Linne's name is now being almost universally 



accepted for the well known D. ceneus of DeGeer. The 

 species is by far the commonest of the whole genus, and 

 may sometimes even stray away from the neighborhood of 

 water ; it is universally distributed, and often occurs by 

 thousands. 



42. D. longitarsis Stann. : this is more commonly known as D. 



eq^uestris of Haliday ; I have never met with it myself, but 

 Haliday caught one male on the sea coast near Holy wood in 

 Co. Down, Ireland, and Col. Terbury took one male at 

 Pembridge in Herefordshire on July 15th, 1902, and another 

 in Woolmer Forest, Hampshire. 



43. D. brevijjennis Meig. : local, but occurring in numerous localities 



from Bournemouth to Aberdeen. 



44. i>. rupestris Hal.: not uncommon on the sides of mountains in 



the Lake District and at Braemar. 



Of these 44 species, 9 have been introduced as British by me, 

 and as I anticipate, at least 20 more will ultimately be found in 

 Britain, I append a List of the European species, arranged for the 

 first time in an attempt at natural alliances. 



(To be continuedj. 



