468 CYRTID^ 



Thorax less punctulate, and consequently more shining than in the male ; 

 humeri and postalar calli very slightly brownish. 



Abdomen with the pale hindmargins of segments narrower and straighter 

 because the abdomen is so much less balloon-shaped ; in a small brightly 

 shining (possibly immature) specimen from Wells the abdomen has incon- 

 spicuous obscurely defined dark luteous markings against the pale hind- 

 margins on the second to fourth segments, and the fifth segment has incon- 

 spicuous similar but more extended markings. Belly with only the 

 hindmargins of the fourth to sixth segments rather broadly white, as well 

 as just the middle of the hindmargin of the third segment. 



Legs in the specimen from Tram Inn more obscurely luteous than in the 

 male, but in the specimen from Wells clear pale yellow. 



Wings as in the male, but in the specimen from Wells (possibly immature) 

 less dark about the foremarginal veins though still with a blackish tinge. 



Length about 5-5 mm. 



This species may be easily distinguished from 0. gihhosus by the 

 blackened margin of the thoracal squamse, from 0. zonatus by its entirely 

 pale legs, and from 0. varius by its hyaline wings. I do not know much 

 about its variations, but Erichson stated that his two specimens had the 

 prothoracic lobes, the postalar calli, and the scutellum, yellowish piceous, 

 but his specimens may have been females as I have found similar traces 

 in that sex. P. Marchal (Bull. Soc. Ent. Fr., 1899, 286) has given some 

 details concerning the eggs and very young larvse of this species ; Giard 

 (Bull. Soc. Ent. Fr., 1894, cliii.) once found a pupa, along side of which 

 were the remains of a spider of the genus Clubiona. 



0. pallipcs is but little known as British, and is still less known in 

 Central Europe where 0. zonatus and 0. varius are well recognised. 

 Colonel Yerbury took two males and a female near Tram Inn on July 23, 

 1902, and one male at Tarrington on August 1, 1902, both these localities 

 being in Herefordshire ; he also took a male at Porthcawl in Glamorgan 

 on July 17, 1906, and Mr C. G. Lamb took an apparently immature female 

 at Wells in Somerset in July 1903. Dr J. H. Wood has also taken a few 

 specimens at Tram Inn and Shobden Marsh, and there is a specimen in 

 the Dale collection at Oxford which was taken at Glanville's Wootton in 

 Dorset on June 23, 1888. Its distribution is not well known, but it 

 probably occurs over most of Central Europe. It is worthy of note that 

 Gerstaecker once sought in a known locality near Berlin for the allied 

 0. zonatus on July 26 and could not find a specimen, but found it 

 plentiful on August 3. 



Synonymy. — This species appears to have been but very little known to German 

 authors, and consequently has been very much confused by them, though most 

 French authors appear to have known and understood it. It is practically certain 

 that the species now described is Latreille's Il.paUipes, of which Fallen's //. gihhosus 

 and Meigen's //. marginatus are synonyms. I am also of opinion that Meigen's 

 //. limhatus is a synonym of this (as ]\Ieigen himself suspected) and not of 0. varius 

 Latr., which has the wings partly bro^vnish, while Meigen's //. limhatus had "fliigel 

 " glasartig." Three specimens in Bigot's collection labelled 0. pallipes are very 

 unsatisfactory; one very immature specimen and one very bad one have the 

 scutellum palish at the tip, while the third is an obvious female 0. pallipes 

 though in very bad condition ; one female in his collection labelled 0. marginatus 

 has the abdomen all obscurely luteous tawny with no clear dorsal spots and the 

 hindmarginal lines inconspicuous but the last segment normally colored and the 

 foremargin of the wing very yellowish but the squamae obviously darkly margined. 



0. zonatus is a very probable British species and is closely allied to 



